阅读说明：本技术 铝合金线及铝合金线的制造方法 (Aluminum alloy wire and method for manufacturing aluminum alloy wire ) 是由 前田徹 桑原铁也 井上明子 荻原宽之 于 2018-12-21 设计创作，主要内容包括：本发明公开了一种铝合金线,其具有以下组成,即,含有合计超过1.4原子％且5.1原子％以下选自Fe、Cr、Ni、Co、Ti、Sc、Zr、Nb、Hf及Ta中的至少1种金属元素,残余部分由Al及不可避免杂质构成,拉伸强度为250MPa以上,导电率为50％IACS以上。(An aluminum alloy wire having a composition containing more than 1.4 atomic% and 5.1 atomic% or less of at least 1 metal element selected from the group consisting of Fe, Cr, Ni, Co, Ti, Sc, Zr, Nb, Hf, and Ta in total, the remainder being composed of Al and unavoidable impurities, a tensile strength of 250MPa or more, and an electrical conductivity of 50% IACS or more.)

1. An aluminum alloy wire having a composition containing more than 1.4 at% and 5.1 at% or less in total of at least 1 metal element selected from the group consisting of Fe, Cr, Ni, Co, Ti, Sc, Zr, Nb, Hf and Ta, with the remainder being composed of Al and unavoidable impurities,

the tensile strength is more than 250MPa,

the conductivity is 50% IACS or more.

2. The aluminum alloy wire according to claim 1,

the metal element is Fe.

3. The aluminum alloy wire according to claim 1,

the metal element is Cr, and the content of Cr is 1.5 atomic% or more and 3.3 atomic% or less.

4. The aluminum alloy wire according to claim 1,

the metal element is Ni, and the content of Ni is 1.6 atomic% or more and 2.4 atomic% or less.

5. The aluminum alloy wire according to claim 1,

the metal element is Co, and the content of Co is more than 1.6 atomic% and less than 1.9 atomic%.

6. The aluminum alloy wire according to claim 1,

the metal element is Ti, and the content of Ti is more than 1.7 atomic% and less than 4.1 atomic%.

7. The aluminum alloy wire according to claim 1,

the metal element is Sc, and the content of Sc is 1.5 atomic% or more and 3.1 atomic% or less.

8. The aluminum alloy wire according to claim 1,

the metal element is Zr, and the content of Zr is 1.5 atomic% or more and 1.9 atomic% or less.

9. The aluminum alloy wire according to claim 1,

the metal element is Nb, and the content of Nb is 1.5 atomic% or more and 3.2 atomic% or less.

10. The aluminum alloy wire according to claim 1,

the metal element is Hf, and the content of Hf is 1.6 at% to 4.6 at%.

11. The aluminum alloy wire according to claim 1,

the metal element is Ta, and the content of Ta is 1.5 at% or more and 3.6 at% or less.

12. The aluminum alloy wire according to any one of claims 1 to 11,

having a structure containing a matrix phase mainly composed of Al and compound particles present in the matrix phase and composed of a compound containing Al and the metal element,

and at least one of the following is satisfied:

a length of a long axis of the compound particle is 500nm or less in a longitudinal section cut at a plane along an axial direction, and

the aspect ratio of the compound particles is 5 or less.

13. The aluminum alloy wire according to any one of claims 1 to 12,

having a structure containing a matrix phase mainly composed of Al and compound particles present in the matrix phase and composed of a compound containing Al and the metal element,

a square measuring region having a side of 5 μm is taken from both a longitudinal section cut at a plane along the axial direction and a cross section cut at a plane orthogonal to the axial direction,

the number of the compound particles in the measurement region of the longitudinal section is 950 to 1500, and the ratio of the total area of the compound particles to the area of the measurement region of the longitudinal section is 5 to 20%,

the number of the compound particles in the measurement region of the cross section is 950 to 4500, and the ratio of the total area of the compound particles to the area of the measurement region of the cross section is 2.5 to 20%.

14. The aluminum alloy wire according to claim 12 or 13,

the content of the metal elements in the mother phase is less than 0.55 atomic% in total.

15. An aluminum alloy wire having a composition containing more than 1.4 at% and 5.1 at% or less of Fe, more than 0.006 at% and 0.1 at% or less of Nd, with the remainder being composed of Al and unavoidable impurities,

the tensile strength is more than 345MPa,

the conductivity is 50% IACS or more.

16. The aluminum alloy wire of claim 15, wherein,

having a structure containing a matrix phase mainly composed of Al and compound particles present in the matrix phase and composed of a compound containing Al, Fe and Nd,

and at least one of the following is satisfied:

a length of a long axis of the compound particle is 105nm or less in a longitudinal section cut at a plane along an axial direction, and

the aspect ratio of the compound particles is less than 3.3.

17. The aluminum alloy wire according to claim 15 or 16,

having a structure containing a matrix phase mainly composed of Al and compound particles present in the matrix phase and composed of a compound containing Al, Fe and Nd,

the number of the compound particles in each measurement region is 2200 to 3800, and the ratio of the total area of the compound particles to the area of each measurement region is 4.5% to 20%.

18. The aluminum alloy wire according to claim 16 or 17,

the content of Fe in the mother phase is less than 0.28 atomic%.

19. The aluminum alloy wire according to any one of claims 1 to 18,

the 0.2% proof stress is more than 50 MPa.

20. The aluminum alloy wire according to any one of claims 1 to 19,

at least one of the following is satisfied:

0.2% proof stress is less than 100 MPa; and

the elongation at break is 10% or more.

21. A method for manufacturing an aluminum alloy wire, comprising the steps of:

a step of producing a first material composed of an aluminum-based alloy containing more than 1.4 at% and 5.1 at% or less in total of at least one metal element selected from the group consisting of Fe, Cr, Ni, Co, Ti, Sc, Zr, Nb, Hf and Ta, and having a solid solution of a metal element, with the remainder composed of Al and unavoidable impurities;

a step of drawing a second material obtained by processing the first material under a condition of a deposition temperature of the metal element or less to produce a drawn wire material having a predetermined wire diameter; and

and a step of performing a heat treatment on the wire-drawing material to precipitate a compound containing Al and the metal element.

22. A method for manufacturing an aluminum alloy wire, comprising the steps of:

a step of producing a first raw material composed of an aluminum-based alloy containing more than 1.4 atomic% and 5.1 atomic% or less of Fe and more than 0.006 atomic% and 0.1 atomic% or less of Nd, and having Fe and Nd dissolved therein, with a remainder composed of Al and unavoidable impurities;

a step of drawing a second material obtained by processing the first material under a condition of a deposition temperature of Fe and Nd or less to produce a drawn wire material having a predetermined wire diameter; and

and a step of depositing a compound containing Al, Fe and Nd by heat-treating the wire-drawing material.

23. The manufacturing method of aluminum alloy wire according to claim 21 or 22,

in the step of producing the first raw material, the molten metal made of the aluminum-based alloy is rapidly cooled to produce the first raw material in a thin strip shape or a powder shape.

24. The aluminum alloy wire production method as set forth in any one of claims 21 to 23,

the heating temperature in the step of heat-treating the wire-drawing material is 300 ℃ or higher.

Technical Field

The present disclosure relates to an aluminum alloy wire and a method for manufacturing the aluminum alloy wire.

The present application claims priority of japanese patent application 2018-.

Background

As a conductor wire for electric wires, patent document 1 discloses an aluminum alloy wire having high strength, high toughness, and high electrical conductivity, which is obtained by softening an aluminum alloy to a specific composition.

Disclosure of Invention

The aluminum alloy wire of the present disclosure has a composition containing more than 1.4 atomic% and 5.1 atomic% or less in total of at least one metal element selected from the group consisting of Fe, Cr, Ni, Co, Ti, Sc, Zr, Nb, Hf, and Ta, with the remainder being composed of Al and unavoidable impurities,

the tensile strength is more than 250MPa,

the conductivity is 50% IACS or more.

Another aluminum alloy wire of the present disclosure has a composition containing more than 1.4 atomic% and 5.1 atomic% or less of Fe, more than 0.006 atomic% and 0.1 atomic% or less of Nd, a residual portion composed of Al and unavoidable impurities,

the tensile strength is more than 345MPa,

the conductivity is 50% IACS or more.

The disclosed method for manufacturing an aluminum alloy wire includes the following steps:

a step of producing a first material composed of an aluminum-based alloy containing more than 1.4 at% and 5.1 at% or less in total of at least one metal element selected from the group consisting of Fe, Cr, Ni, Co, Ti, Sc, Zr, Nb, Hf and Ta, and having a solid solution of a metal element, with the remainder composed of Al and unavoidable impurities;

a step of drawing a second material obtained by processing the first material under a condition of a deposition temperature of the metal element or less to produce a drawn wire material having a predetermined wire diameter; and

and a step of performing a heat treatment on the wire-drawing material to precipitate a compound containing Al and the metal element.

Another method for manufacturing an aluminum alloy wire according to the present disclosure includes the steps of:

a step of producing a first raw material composed of an aluminum-based alloy containing more than 1.4 at% and 5.1 at% or less of Fe, more than 0.006 at% and 0.1 at% or less of Nd, and containing Fe and Nd as solid solutions, with the remainder composed of Al and unavoidable impurities;

a step of drawing a second material obtained by processing the first material under a condition of a deposition temperature of Fe and Nd or less to produce a drawn wire material having a predetermined wire diameter; and

and a step of performing heat treatment on the wire-drawing material to precipitate a compound containing Al, Fe, and Nd.

Detailed Description

[ problems to be solved by the present disclosure ]

An aluminum alloy wire having excellent conductivity and higher strength is desired as a conductor wire for electric wires.

The aluminum alloy wire described in patent document 1 has an elongation at break of 10% or more and high toughness, but has a tensile strength of 200MPa or less. For example, as an extremely thin wire (for example, wire diameter of 100 μm or less) used for earphones and the like, it is desired that the elongation at break is 10% or more and the fatigue strength against repeated bending is high so as not to be cut by sound vibration or the like. If the tensile strength is increased, the fatigue strength tends to be increased. However, in patent document 1, the improvement of strength is limited by setting the Fe content to 2.2 mass% or less. Therefore, an aluminum alloy wire having higher tensile strength, particularly an aluminum alloy wire having a tensile strength of 250MPa or more, is desired. In addition to the tensile strength, an aluminum alloy wire having a high elongation at break and the like, excellent elongation, and easy bending is more preferable.

In addition, in the use of the conductor line, high conductivity is desired. In general, if the content of the additive element in the alloy is increased, the strength tends to be improved. However, if the additive element is a solid-solution strengthening type, the conductivity decreases as the content of the additive element increases. This is because the solid solution amount of the additive element in the matrix phase of the alloy increases. Even if the additive element is capable of being precipitated, the conductivity may be lowered depending on the state of the precipitate. For example, if the precipitates are coarse particles, agglomerated or continuous long precipitates, the conductive path of Al is hindered, and the resistance is increased. Even more, the conductivity decreases. Further, for example, if the continuous cast product and the billet cast product described in patent document 1 are produced from an alloy containing a large amount of additive elements that can be precipitated, these cast products and the like easily contain the above-described coarse particles. The coarse particles are likely to serve as starting points for fracture. Therefore, if the above-mentioned casting material or the like is used for wire drawing, the wire drawability is lowered, and the productivity of the wire drawing material is lowered. Further, the coarse particles remain in the wire-drawing material, or are elongated during wire drawing, so that particles that are further elongated tend to be present. Therefore, when the conductor wire of the final product is stretched, bent, or repeatedly bent during use, for example, the conductor wire is likely to break starting from the coarse particles or the like, and the strength and fatigue strength are likely to be reduced.

Accordingly, it is an object of the present disclosure to provide an aluminum alloy wire having high strength and excellent electrical conductivity. Another object of the present disclosure is to provide a method for manufacturing an aluminum alloy wire, which can manufacture an aluminum alloy wire having high strength and excellent conductivity.

[ Effect of the present disclosure ]

The aluminum alloy wire of the present disclosure has high strength and excellent conductivity. The disclosed method for producing an aluminum alloy wire can produce an aluminum alloy wire having high strength and excellent conductivity.

[ description of embodiments of the present disclosure ]

First, embodiments of the present disclosure are listed and explained.

(1) An aluminum alloy wire according to one embodiment of the present disclosure has a composition,

contains more than 1.4 atomic% and 5.1 atomic% or less of at least one metal element selected from the group consisting of Fe, Cr, Ni, Co, Ti, Sc, Zr, Nb, Hf and Ta in total, and the remainder is composed of Al and unavoidable impurities,

the tensile strength is more than 250MPa,

the conductivity is 50% IACS or more.

The metal elements (hereinafter, sometimes referred to as "first elements") listed above are elements that easily form a binary intermetallic compound with Al and precipitate, as will be described later in detail. The aluminum-based alloy (hereinafter, sometimes referred to as Al-based alloy) constituting the aluminum alloy wire (hereinafter, sometimes referred to as Al alloy wire) of the present disclosure contains the first element as an additive element within the above-specified range.

The Al-based alloy contains a large amount of a first element such as Fe. The first element exists mainly as a precipitate. Therefore, the Al alloy wire of the present disclosure has a tensile strength as high as 250MPa or more, i.e., a high strength, and an electric conductivity as high as 50% IACS or more, i.e., an excellent electric conductivity. Further, since the Al alloy wire of the present disclosure has a high tensile strength as described above, the fatigue strength against repeated bending is also high. Further, the Al alloy wire of the present disclosure can suppress an excessively high stiffness to bending and further reduce springback. Such an Al alloy wire of the present disclosure can be suitably used for a conductor for an electric wire and the like.

When the aluminum alloy wire of the present disclosure is produced by a method for producing an Al alloy wire according to one embodiment of the present disclosure, which will be described later, the aluminum alloy wire is less likely to break during wire drawing and has excellent productivity.

(2) As an example of the Al alloy wire of the present disclosure, an embodiment in which the metal element is Fe may be mentioned.

The above embodiment has high strength and excellent conductivity, and is also excellent in manufacturability. This is because if the first element is Fe, molten metal is easily produced in the production process. Further, since heat treatment is performed after wire drawing, precipitates are easily precipitated appropriately, and industrial productivity is excellent. Further, since Fe is an element that is easily available, the above-described method can reduce the manufacturing cost.

(3) An example of the Al alloy wire of the present disclosure may be an embodiment in which the metal element is Cr and the content of Cr is 1.5 at% or more and 3.3 at% or less.

The above-described method has high strength and excellent conductivity. In addition, the above method is also excellent in manufacturability. Since Cr is easily used in terms of industrial productivity.

(4) An example of the Al alloy wire of the present disclosure may be an embodiment in which the metal element is Ni and the content of Ni is 1.6 at% or more and 2.4 at% or less.

The above-described method has high strength and excellent conductivity. In addition, the above method is also excellent in manufacturability. Since Ni is easy to use in terms of industrial productivity.

(5) An example of the Al alloy wire of the present disclosure may be an embodiment in which the metal element is Co and the content of Co is 1.6 at% or more and 1.9 at% or less.

The above-described method has high strength and excellent conductivity. In addition, the above method is also excellent in manufacturability. Since Co is easy to use in terms of industrial productivity.

(6) An example of the Al alloy wire of the present disclosure may be an embodiment in which the metal element is Ti and the content of Ti is 1.7 at% or more and 4.1 at% or less.

The above-described method has high strength and excellent conductivity. In particular, compounds containing Al and Ti are easily made fine. Therefore, the above-described mode is more excellent in strength. In addition, Ti is easy to use in terms of industrial productivity, and the above embodiment is also excellent in terms of manufacturability.

(7) An example of the Al alloy wire of the present disclosure may be an embodiment in which the metal element is Sc, and the Sc content is 1.5 at% or more and 3.1 at% or less.

The above-described method has high strength and excellent conductivity. In particular, compounds containing Al and Sc tend to be fine. Therefore, the above-described mode is more excellent in strength.

(8) An example of the Al alloy wire of the present disclosure may be an embodiment in which the metal element is Zr, and the content of Zr is 1.5 at% or more and 1.9 at% or less.

The above-described method has high strength and excellent conductivity. In particular, compounds containing Al and Zr tend to be fine. Therefore, the above-described mode is more excellent in strength.

(9) An example of the Al alloy wire of the present disclosure may be an embodiment in which the metal element is Nb, and the content of Nb is 1.5 at% or more and 3.2 at% or less.

The above-described method has high strength and excellent conductivity. In particular, compounds containing Al and Nb tend to be fine. Therefore, the above-described mode is more excellent in strength.

(10) An example of the Al alloy wire of the present disclosure may be an embodiment in which the metal element is Hf and the content of Hf is 1.6 at% or more and 4.6 at% or less.

The above-described method has high strength and excellent conductivity. In particular, compounds containing Al and Hf tend to be fine. Therefore, the above-described mode is more excellent in strength.

(11) An example of the Al alloy wire of the present disclosure may be an embodiment in which the metal element is Ta and the content of Ta is 1.5 at% or more and 3.6 at% or less.

The above-described method has high strength and excellent conductivity. In particular, compounds containing Al and Ta tend to be fine. Therefore, the above-described mode is more excellent in strength.

(12) As an example of the Al alloy wire of the present disclosure,

an example of the method includes a method of having a structure including a matrix phase mainly containing Al and compound particles present in the matrix phase and composed of a compound including Al and the metal element, and satisfying at least any one of the following conditions:

a longitudinal section taken along a plane in the axial direction, wherein the length of the long axis of the compound particle is 500nm or less, and the aspect ratio of the compound particle is 5 or less.

The method of measuring the major axis length and aspect ratio is described in test example 1 described later.

The above-described embodiment suitably has an effect of improving the strength due to the dispersion strengthening of the compound particles containing Al and the first element, and an effect of providing high conductivity due to the decrease in the amount of the first element dissolved in the matrix, and is excellent in the strength and the conductivity. In particular, in the above embodiment, the length of the long axis of the compound particle is as short as 500nm or less in the longitudinal section. Alternatively, in the above aspect, the aspect ratio of the compound particles is as small as 5 or less in a longitudinal section. Qualitatively, the particles of the above compounds are nearly spherical. If the particles of the above-mentioned compound are short or nearly spherical, they are easily uniformly dispersed in the matrix phase. In the above embodiment, the strength is further improved by uniformly dispersing the compound particles. In addition, the above embodiment further reduces the spring back, and reduces the inhibition of the conductive path of Al by the compound particles, thereby further improving the conductivity. In the above aspect, when a force is applied in a direction intersecting the axial direction of the Al alloy wire, the compound particles are less likely to serve as starting points of fracture. Therefore, the above embodiment is easy to bend, has excellent bendability, and further has excellent fatigue strength. These effects are easily obtained when the long axis length of the compound particles is 500nm or less and the aspect ratio is 5 or less. Thus, the above-mentioned embodiment in which the compound particles are appropriately present tends to have a high elongation at break as well, and also has high strength and high toughness.

(13) An example of the Al alloy wire of the present disclosure includes a structure having a matrix phase mainly composed of Al and compound particles present in the matrix phase and composed of a compound containing Al and the metal element,

a square measuring region having a side of 5 μm is taken from both a longitudinal section cut at a plane along the axial direction and a cross section cut at a plane orthogonal to the axial direction,

the number of the compound particles in the measurement region of the longitudinal section is 950 to 1500, and the ratio of the total area of the compound particles to the area of the measurement region of the longitudinal section is 5 to 20%,

the number of the compound particles in the measurement region of the cross section is 950 to 4500, and the ratio of the total area of the compound particles to the area of the measurement region of the cross section is 2.5 to 20%.

The method of measuring the number and the area ratio is described in test example 1 described later.

The above-described embodiment suitably has an effect of improving the strength due to the dispersion strengthening of the compound particles containing Al and the first element, and an effect of providing high conductivity due to the decrease in the amount of the first element dissolved in the matrix, and the high strength and the conductivity are further excellent. In particular, in the above-described mode, the amounts of the compound particles existing in the longitudinal section and the cross section are similar, and it can be said that the directionality (anisotropy) of the existing state of the compound particles is small. Therefore, the above-described embodiment is easy to bend, or excellent in bendability, or further excellent in fatigue strength, or is not easy to work harden by bending. In addition, the above-mentioned mode can be said that the above-mentioned compound particles are present finely. Therefore, the above embodiment further improves the strength by dispersing the fine compound particles. In addition, the above embodiment further reduces the spring back or the inhibition of the conductive path of Al by the compound particles, thereby further improving the conductivity. Thus, the above-described mode in which the compound particles are appropriately used tends to have a high elongation at break as well, and also has high strength and high toughness.

(14) An example of the Al alloy wire having a structure including the compound particles includes a mode in which the total content of the metal elements in the matrix phase is less than 0.55 atomic%.

In the above embodiment, it can be said that the amount of the first element dissolved in the mother phase is very small, the purity of Al in the mother phase is high, and the electrical conductivity is further excellent. In the above embodiment, the first element is mainly present as compound particles. Therefore, the above embodiment can suitably obtain the effect of improving the strength by the dispersion strengthening of the compound particles, and the strength is further excellent.

(15) An aluminum alloy wire according to another embodiment of the present disclosure (hereinafter, may be referred to as a second Al alloy wire of the present disclosure) has a composition,

contains more than 1.4 atomic% and 5.1 atomic% or less of Fe, more than 0.006 atomic% and 0.1 atomic% or less of Nd, and the remainder is composed of Al and unavoidable impurities,

the tensile strength is more than 345MPa,

the conductivity is 50% IACS or more.

The present inventors have found that if a slight amount of Nd is contained in an Al-based alloy containing Fe within the above-described specific range, the tensile strength is greatly improved and the strength is further improved. The second Al alloy wire of the present disclosure is a substance obtained based on this finding.

In the second Al alloy wire of the present disclosure, a trace amount of Nd is contained as the second element on the basis of the Al-based alloy in which the first element is Fe. The Al-based alloy contains relatively large amounts of Fe. Fe mainly exists as precipitates. Nd is contained in a precipitate (a compound containing Al and Fe) containing the Fe. Further, the precipitates containing Nd (a compound containing Al, Fe, and Nd) are finer than those containing no Nd. The second Al alloy wire of the present disclosure has a very high tensile strength of 345MPa or more by dispersion strengthening of fine precipitates. Further, since the precipitates are fine, the conductive path of Al is not easily obstructed. Further, the content of Nd is very small, and the decrease in conductivity due to the content of Nd is easily suppressed. The second Al alloy wire of the present disclosure has a high electrical conductivity of 50% IACS or more and is excellent in electrical conductivity. Further, the second Al alloy wire of the present disclosure has high fatigue strength against repeated bending because of high tensile strength. Further, the second Al alloy wire of the present disclosure can suppress the stiffness against bending from becoming too high and reduce springback. Such a second Al alloy wire of the present disclosure can be suitably used for a conductor for an electric wire and the like.

The second Al alloy wire of the present disclosure is less likely to break during wire drawing and is excellent in productivity if it is produced by a method for producing an Al alloy wire according to another embodiment of the present disclosure, which will be described later.

(16) As an example of the second Al alloy wire of the present disclosure, there may be mentioned a wire having a structure including a matrix phase mainly composed of Al and compound particles present in the matrix phase and composed of a compound including Al, Fe, and Nd, and satisfying at least any one of the following:

a longitudinal section taken along a plane in the axial direction, wherein the length of the long axis of the compound particle is 105nm or less, and the aspect ratio of the compound particle is less than 3.3.

The above-described embodiment suitably has an effect of improving strength due to dispersion strengthening of compound particles containing Al, Fe, and Nd, and an effect of providing high conductivity due to a decrease in the amount of solid solution of Fe and Nd in the matrix phase, and is excellent in strength and conductivity. In particular, in the above embodiment, the length of the long axis of the compound particle is as short as 105nm or less in the longitudinal section. Alternatively, in the above aspect, the aspect ratio of the compound particles is as small as less than 3.3 in a longitudinal section. Qualitatively, the particles of the above compounds are nearly spherical. Such compound particles are easily and uniformly dispersed in the matrix phase as described above. Therefore, the above embodiment can easily obtain the effect of the uniform dispersion of the compound particles. The above-mentioned effects include an improvement in strength, a reduction in springback, an improvement in conductivity, and the like. In addition, the above embodiment can easily obtain an effect caused by the fact that the compound particles are less likely to become starting points of fracture. The above-mentioned effects include an effect of improving the bending property and the fatigue strength. When the long axis length of the compound particles is 105nm or less and the aspect ratio is less than 3.3, the above effects are easily obtained. Thus, the above-mentioned embodiment in which the compound particles are appropriately present tends to have a high elongation at break as well, and also has high strength and high toughness.

(17) As an example of the second Al alloy wire of the present disclosure, there can be mentioned a wire having a structure including a matrix phase mainly composed of Al and compound particles present in the matrix phase and composed of a compound including Al, Fe, and Nd,

and a square measuring region having a side length of 5 μm, wherein the number of the compound particles in each measuring region is 2200 to 3800, and the ratio of the total area of the compound particles to the area of each measuring region is 4.5% to 20%.

The above-described embodiment suitably has an effect of improving strength due to dispersion strengthening of compound particles containing Al, Fe, and Nd, and an effect of providing high conductivity due to a decrease in the amount of solid solution of Fe and Nd to the matrix phase, and further has more excellent strength and conductivity. In particular, in the above-described embodiment, the amount of the compound particles present is substantially the same in both the longitudinal section and the transverse section, and the directionality (anisotropy) of the presence state of the compound particles is small or substantially absent. Therefore, the effect due to the small anisotropy can be easily obtained. The above-mentioned effects are, for example, excellent bendability, improvement in fatigue strength, and improvement in the difficulty of work hardening due to bending. Further, the above-described mode can be said to be finer in the compound particles than the case where Nd is not contained. Therefore, the above embodiment can easily obtain the effect due to the dispersion of the fine compound particles. The above-mentioned effects include an improvement in strength, a reduction in springback, an improvement in conductivity, and the like. Thus, the above-mentioned embodiment in which the compound particles are appropriately present tends to have a high elongation at break as well, and also has high strength and high toughness.

(18) An example of the second Al alloy wire of the present disclosure may be a wire in which the content of Fe in the matrix phase is less than 0.28 atomic%.

In the above embodiment, it can be said that the amount of Fe dissolved in the matrix phase is very small, the purity of Al in the matrix phase is high, and the conductivity is further excellent. In the above embodiment, Fe is mainly present as compound particles. Therefore, the above embodiment can suitably obtain the effect of improving the strength by the dispersion strengthening of the compound particles, and the strength is further excellent.

(19) An example of the Al alloy wire of the present disclosure may be a wire having a 0.2% proof stress of 50MPa or more.

The above-described mode is excellent in fracture durability in an actual use environment.

(20) As an example of the Al alloy wire of the present disclosure, at least one of the following may be satisfied: 0.2% proof stress is less than 100 MPa; and a mode of elongation at break of 10% or more.

As described above, the tensile strength and the electrical conductivity are high, and the 0.2% proof stress is not excessively high and is 100MPa or less, or the elongation at break is as high as 10% or more. Such an embodiment is excellent in bendability with easy bending, is further excellent in fatigue strength, and is less likely to break when subjected to impact. Further, when an Al alloy wire having a 0.2% proof stress of 100MPa or less is used for a conductor wire of a terminal-equipped wire or the like and a crimp terminal or the like is attached, the connection strength with the terminal is excellent.

(21) A method for manufacturing an aluminum alloy wire (Al alloy wire) according to an embodiment of the present disclosure (hereinafter, may be referred to as a first manufacturing method) includes:

a step of producing a first raw material composed of an aluminum-based alloy having a composition containing more than 1.4 at% and 5.1 at% or less of at least one metal element selected from the group consisting of Fe, Cr, Ni, Co, Ti, Sc, Zr, Nb, Hf and Ta, and containing Al and unavoidable impurities as a remainder, and a solid solution of the metal element;

a step of manufacturing a wire-drawn material having a predetermined wire diameter by wire-drawing a second material obtained by working the first material under a condition of a deposition temperature of the metal element or lower; and

and a step of performing a heat treatment on the wire-drawing material to precipitate a compound containing Al and the metal element.

The present inventors have studied conditions under which an Al alloy wire can be produced with excellent productivity, with respect to an Al-based alloy having a higher Fe content than that of patent document 1(2.2 mass%), and with which the wire is not easily broken during wire drawing. As a result, it was found that, if a method capable of rapid freezing is used, wire breakage is difficult with a material in which Fe is dissolved in a solid solution, and wire drawing can be performed well, as compared with a conventional continuous casting method using a movable mold and a conventional casting method using a fixed mold. Further, it is also found that if heat treatment is performed after wire drawing to precipitate Fe, an Al alloy wire having not only excellent conductivity but also high strength can be obtained. Since the working strain and the like at the time of drawing can be removed by the heat treatment, not only the conductivity is further improved, but also the elongation is improved, and the bending and the like are easily performed. Further, since Fe is dissolved in the solid, the precipitates do not stretch during drawing. According to this aspect, it is also possible to prevent a decrease in bendability due to long precipitate particles, an obstruction of the conductive path of Al due to long precipitate particles, and the like. Therefore, an Al alloy wire having not only excellent bendability but also more excellent conductivity can be obtained. The same applies to the first element (except for Fe) satisfying the specified conditions (I) and (II) described later. The method for producing the Al alloy wire of the present disclosure is based on these findings.

The disclosed method for producing an Al alloy wire uses an Al-based alloy having a high first element content, wherein the first element content is greater than 1.4 atomic% (3 mass% or more when the first element is Fe). However, the material used for the wire drawing process is a material in which the first element is substantially not precipitated. Therefore, the wire drawing process can be performed satisfactorily. Further, heat treatment is performed after drawing to precipitate the first element. Therefore, the compound containing Al and the first element is dispersed as fine particles. Therefore, the method for producing an Al alloy wire according to the present disclosure can produce an Al alloy wire having excellent strength by the effect of improving the strength by dispersion strengthening of fine compound particles.

Further, the amount of the first element dissolved in the mother phase can be reduced by precipitation of the first element. Since the compound particles are fine, the conductive path of Al is not easily obstructed. Therefore, the method for producing an Al alloy wire according to the present disclosure can produce an Al alloy wire having excellent conductivity.

According to the method for producing an Al alloy wire of the present disclosure, an aluminum alloy wire having high strength and excellent conductivity, typically an aluminum alloy wire having a tensile strength of 250MPa or more and an electrical conductivity of 50% IACS or more, can be produced with good productivity.

(22) A method for manufacturing an aluminum alloy wire (Al alloy wire) according to another aspect of the present disclosure (hereinafter, may be referred to as a second manufacturing method) includes:

a step of producing a first raw material composed of an aluminum-based alloy containing more than 1.4 atomic% and 5.1 atomic% or less of Fe and more than 0.006 atomic% and 0.1 atomic% or less of Nd, and containing Fe and Nd as solid solutions, with the remainder being composed of Al and unavoidable impurities;

a step of drawing a second material obtained by processing the first material under a condition of a deposition temperature of Fe and Nd or less to produce a drawn wire material having a predetermined wire diameter; and

and a step of depositing a compound containing Al, Fe and Nd by heat-treating the wire-drawing material.

The second method of the present disclosure uses an Al-based alloy containing Fe up to more than 1.4 atomic% and Nd. However, as a raw material for wire drawing, a material in which Fe and Nd are not substantially precipitated is used. Therefore, the wire drawing process can be performed satisfactorily. After wire drawing, heat treatment was performed to precipitate Fe and Nd. Therefore, a compound containing Al, Fe, and Nd is dispersed as fine particles. Therefore, the second production method can produce an Al alloy wire having excellent strength by the effect of improving the strength by dispersion strengthening of the fine compound particles, as in the first production method. In particular, by containing Nd, the compound particles are easily made finer. Therefore, the second manufacturing method can manufacture an Al alloy wire having more excellent strength.

Further, the amount of solid solution of Fe and Nd in the mother phase can be reduced by precipitation of Fe and Nd. Further, as described above, since the compound particles are fine, the conduction path of Al is not easily obstructed. Therefore, the second manufacturing method can manufacture the aluminum alloy wire having excellent conductivity, as in the first manufacturing method.

According to the second production method, an Al alloy wire having a higher strength and excellent electrical conductivity, typically, an Al alloy wire having a tensile strength of 345MPa or more and an electrical conductivity of 50% IACS or more can be produced with good productivity.

(23) As an example of the method for producing the Al alloy wire of the present disclosure, there may be mentioned a method for producing the first material in a thin strip or powder form by rapidly cooling a molten metal made of the aluminum-based alloy in the step of producing the first material. The rapid cooling herein means that the cooling rate of the molten metal is set to 10000 ℃/sec or more.

The above-described method manufactures the first raw material by a so-called liquid rapid cooling solidification method, an atomization method, or the like. In the above embodiment, the first element or the raw material in which Fe and Nd are dissolved is appropriately obtained.

(24) An example of the method for producing an Al alloy wire according to the present disclosure is a method in which the heating temperature in the step of heat-treating the wire-drawn material is 300 ℃.

In the above-described embodiment, the first element or Fe and Nd can be easily precipitated even in a relatively short time by setting the heating temperature in the heat treatment step to 300 ℃. By shortening the heat treatment time, the above-described method enables to produce an Al alloy wire having high strength and excellent conductivity with good productivity. Further, by performing heat treatment at 300 ℃ or higher, the Al-based alloy has a stable crystal structure. Therefore, according to the above-described aspect, an Al alloy wire having high strength and excellent conductivity over a long period of time can be manufactured, in which deterioration of strength and conductivity with age does not easily occur even in a high-temperature use environment.

[ details of embodiments of the present disclosure ]

Embodiments of the present disclosure are described in detail below.

[ aluminum alloy wire ]

(summary)