Ti-containing amorphous intermediate alloy refiner and preparation method thereof
阅读说明：本技术 一种含Ti非晶中间合金细化剂及其制备方法 (Ti-containing amorphous intermediate alloy refiner and preparation method thereof ) 是由 朱胜利 徐文龙 于 2020-11-26 设计创作，主要内容包括：本发明公开了一种含Ti非晶中间合金细化剂,从而获得力学性能更为优异的铝合金,以满足车轮等领域的需求。所述一种含Ti非晶中间合金细化剂,其特征在于,所述的一种含Ti非晶中间合金细化剂包括原子百分比为80-92%的Al、原子百分比为4-12%的Y、原子百分比为0-10%的Ti,所述的一种含Ti非晶中间合金细化剂是非晶合金,本发明的有益技术效果包括：细化铝合金的晶粒,从而获得力学性能更优异的铝合金,以满足铝合金车轮材质的要求,该细化剂提高了铝合金的强度和塑性,该铝合金非常适合于制造汽车车轮。(The invention discloses a Ti-containing amorphous intermediate alloy refiner, so that an aluminum alloy with more excellent mechanical property can be obtained to meet the requirements of the fields of wheels and the like. The Ti-containing amorphous master alloy refiner is characterized by comprising 80-92% of Al in atomic percentage, 4-12% of Y in atomic percentage and 0-10% of Ti in atomic percentage, and is an amorphous alloy, and the Ti-containing amorphous master alloy refiner has the beneficial technical effects that: the grain of the aluminum alloy is refined, so that the aluminum alloy with more excellent mechanical property is obtained to meet the requirement of the aluminum alloy wheel material, the refiner improves the strength and the plasticity of the aluminum alloy, and the aluminum alloy is very suitable for manufacturing automobile wheels.)
1. The Ti-containing amorphous master alloy refiner is characterized by comprising 80-92% of Al by atomic percentage, 4-12% of Y by atomic percentage and 0-10% of Ti by atomic percentage.
2. A Ti-containing amorphous master alloy refiner as claimed in claim 1, characterized in that said Ti-containing amorphous master alloy refiner is composed of Al 86-92% by atomic percentage, Y4-10% by atomic percentage, Ti 2-6% by atomic percentage.
3. A Ti-containing amorphous master alloy refiner as claimed in claim 1, characterized in that said Ti-containing amorphous master alloy refiner is composed of Al90 at%, Y8 at% and Ti2 at%.
4. A Ti-containing amorphous master alloy refiner according to any one of claims 1-3, characterized in that said Ti-containing amorphous master alloy refiner is an amorphous alloy.
5. A Ti-containing amorphous master alloy refiner according to claim 4, characterized in that said Ti-containing amorphous master alloy refiner is an Al-Y-Ti amorphous strip.
6. A preparation method of a Ti-containing amorphous master alloy refiner is characterized by comprising the following steps:
(1) the simple substances of various metals are added into an induction smelting furnace according to a proportion and are smelted in an inert gas atmosphere;
(2) putting the smelted master alloy into a quartz tube, and preparing the melt in the step (1) into a cylindrical or strip casting by using a copper mold casting method.
7. The method for preparing a Ti-containing amorphous master alloy refiner according to claim 6, characterized in that the smelting in the step (1) is carried out in an electric arc smelting furnace.
8. The method for preparing a Ti-containing amorphous master alloy refiner as claimed in claim 6, wherein the step (2) uses a single-roller spinning method to prepare the melt into alloy strips.
9. An aluminum alloy refining treatment process is characterized in that a refiner is used for refining and refining an aluminum-yttrium-titanium amorphous strip intermediate alloy, and the refining treatment process comprises the following steps:
step one, preparing an amorphous intermediate alloy refiner containing Ti: preparing an aluminum-yttrium-titanium amorphous strip according to the atomic percent of 80-92 percent of Al, 4-12 percent of Y and 0-10 percent of Ti;
step two, smelting and refining: adopting aluminum alloy as an alloy raw material, taking the aluminum-yttrium-titanium amorphous strip prepared in the step one as an intermediate alloy, smelting by adopting a crucible resistance furnace, wherein the smelting temperature is 770-800 ℃, putting the alloy raw material at the smelting temperature, preserving the heat for 30-50 minutes, and stirring until the alloy raw material is completely molten; adding the aluminum-yttrium-titanium amorphous strip prepared in the step one according to the mass percent of 0.2-0.6% of the alloy raw material, and preserving the heat at the temperature of 770-800 ℃ for 5-120 minutes;
step three, gravity casting: after the heat preservation is finished, taking out the crucible after stirring, casting the aluminum melt into a cast iron mold, and naturally cooling in air to form a bar;
step four, heat treatment: carrying out heat treatment on the bar in the cast iron die, wherein the heat treatment comprises the following steps: keeping the temperature of the bar in a heat treatment furnace at 540 ℃ for 2 hours, and quenching the bar in hot water at 80 ℃; aging treatment: and after the quenching treatment is finished, transferring the bar into a heat treatment furnace at the temperature of 150 ℃, preserving the heat for 12 hours, and cooling in air.
Technical Field
The invention discloses a Ti-containing amorphous master alloy refiner and a preparation method thereof, relates to a Ti-containing amorphous master alloy refiner, and belongs to the field of smelting and processing of aluminum alloy. In particular to an aluminum alloy refiner for refining aluminum alloy so as to obtain the aluminum alloy with more excellent mechanical property and meet the requirements of the fields of wheels and the like.
Background
Aluminum alloys have good mechanical and casting properties, such as lower density, higher strength, excellent fluidity, good corrosion resistance, etc., and thus have been used in a large number of applications in the aerospace, automotive, machine manufacturing, marine and chemical industries. The aluminum alloy is used for replacing steel to realize the light weight of the vehicle, and the requirements of energy conservation, emission reduction and environmental protection can be met. The aluminum alloy is adopted to replace steel materials, and the structural weight can be reduced by more than 50%. With the vigorous development of the automobile industry, the aluminum alloy wheel is widely applied to low-end, medium-end and high-end automobiles at present due to the advantages of attractive and elegant appearance, good heat dissipation performance, portability, oil saving, good expansion and contraction rate, high elasticity, good rigidity, good roundness protection and the like. Currently, in the international automobile industry, A356 aluminum alloy is often used for casting wheels. The A356 aluminum alloy is Al-Si-Mg series alloy, the mass content of Si is 6.5-7.5%, the mass content of Mg is 0.25-0.35%, and the mass content of Si is more than 6%, which belongs to hypoeutectic structure. The general requirements for the mechanical properties of the A356 aluminum alloy of an automobile wheel pair are as follows: tensile strength (Rm) > 220 MPa, yield strength (Rp0.2) >180 MPa and elongation (As) >7 percent. The mechanical property of A356 of the traditional Al-5Ti-1B intermediate alloy is Rm: 270-280 MPa, Rp0.2: 220-230 MPa, As: 8 to 9 percent. In recent years, with the continuous development of automobile manufacturing technology, higher requirements are put on the comprehensive mechanical properties of aluminum alloy.
Grain refinement is a means for effectively improving the comprehensive mechanical properties of metal materials, and is widely applied to the production of aluminum alloys. The traditional aluminum alloy refiner is Al-Ti-B, Al-Ti-B-C alloy and the like, and is rich in AlB2Al of particles3Ti3B intermediate alloy in p-Al9Si0.45The grain refinement of Mg aluminum alloy is better than that of Al5Ti1The main reason for the better refining effect of the B alloy is that the alpha-Al phase precipitated first has good refining effect, and the ductility of the refined alloy is improved due to the reduction of defects such as oxides, air holes and the like in the alloy and the reduction of grain size. Al with uniform microstructure3Ti1B0.2TiB produced by adding C master alloy to molten green leaves2The particles show a layered dendritic structure, and the TiC particles doped with a small amount of B show a polyhedral structure, so that the intermediate alloy has a good refining effect on the A356 aluminum alloy. When zirconium is present in the alloy being refined, the refining effect of the Al-Ti-B series refiner is greatly reduced, a phenomenon known as "zirconium poisoning" which is mainly due to the presence of zirconium causing TiB during the refining process2Two-dimensional Al formed on (0001) plane of (A)3Decomposition of Ti structure with formation of Ti at the site2Zr layer obstructing TiB2Become nucleation particles of alpha-Al phase. In addition, the influence mechanism of many elements such as Sr, Si, Ti, etc. on the grain refinement of aluminum alloy is studied. On the basis of the research of the traditional refiner, some rare earth elements are introduced into the refiner of the aluminum alloy. The rare earth element Y is introduced on the basis of the Al-Ti-B-C series refiner, so that the Al-Cu-Mn alloy with excellent refining effect can be obtained2La1LaB of B intermediate alloy in refining process6The particles are used as heterogeneous nucleation particles of the alpha-Al phase, thereby achieving better refining effect.
However, the existing commercially used Al-Ti-B refiner can generate coarse acicular TiAl in the practical use process3Phase, and TiB as nucleation center2Easily gather into a mass. At the same time, because of TiB2The aluminum liquid is easy to gather at high temperature, which limits the application of the refiner in industry, and the aluminum liquid is easy to return to process or even scrap, thus causing great waste. The refiner containing C is difficult to produce, has unstable quality and cannot be applied to industry in large scale.
In order to overcome the above technical problems, a novel aluminum alloy refiner is urgently needed to improve the comprehensive mechanical properties of the aluminum alloy.
Disclosure of Invention
Therefore, the invention aims to provide a Ti-containing amorphous master alloy refiner, so that an aluminum alloy with more excellent mechanical properties can be obtained, and the requirements of the fields of wheels and the like can be met. In order to achieve the above object, the present invention provides the following technical solutions:
the invention relates to a Ti-containing amorphous master alloy refiner which is characterized by comprising 80-92% of Al, 4-12% of Y and 0-10% of Ti in atomic percentage; preferably, the Ti-containing amorphous master alloy refiner is an amorphous alloy.
Preferably, the Ti-containing amorphous master alloy refiner consists of 86-92% of Al by atomic percentage, 4-10% of Y by atomic percentage and 2-6% of Ti by atomic percentage, and the Ti-containing amorphous master alloy refiner is amorphous alloy.
Preferably, the Ti-containing amorphous master alloy refiner consists of 90 atomic percent of Al, 8 atomic percent of Y and 2 atomic percent of Ti, and the Ti-containing amorphous master alloy refiner is amorphous alloy.
The preparation method of the Ti-containing amorphous master alloy refiner comprises the following steps:
(1) adding the simple substances of the various metals into an induction melting furnace or an electric arc melting furnace according to the proportion, and melting in an inert gas atmosphere. Preferably, smelting is carried out in an electric arc smelting furnace;
(2) putting the smelted master alloy into a quartz tube, and preparing the melt in the step (1) into a cylindrical or strip casting by using a copper mold casting or single-roller rotary quenching method; preferably, the step (2) uses a single-roller spinning method to prepare the melt into an alloy strip.
The Ti-containing amorphous master alloy refiner is an aluminum-yttrium-titanium amorphous strip.
The invention also relates to an aluminum alloy refining treatment process, wherein the refiner is used for refining the intermediate alloy of the aluminum-yttrium-titanium amorphous strip, and the refining treatment process comprises the following steps:
step one, preparing an amorphous intermediate alloy refiner containing Ti: preparing an aluminum-yttrium-titanium amorphous strip according to the atomic percent of 80-92 percent of Al, 4-12 percent of Y and 0-10 percent of Ti;
step two, smelting and refining: adopting aluminum alloy as an alloy raw material, taking the aluminum-yttrium-titanium amorphous strip prepared in the step one as an intermediate alloy, smelting by adopting a crucible resistance furnace, wherein the smelting temperature is 770-800 ℃, putting the alloy raw material at the smelting temperature, preserving the heat for 30-50 minutes, and stirring until the alloy raw material is completely molten; adding the aluminum-yttrium-titanium amorphous strip prepared in the step one according to the mass percent of 0.2-0.6% of the alloy raw material, and preserving the heat at the temperature of 770-800 ℃ for 5-120 minutes;
step three, gravity casting: after the heat preservation is finished, taking out the crucible after stirring, casting the aluminum melt into a cast iron mold, and naturally cooling in air to form a bar;
step four, heat treatment: carrying out heat treatment on the bar in the cast iron die, wherein the heat treatment comprises the following steps: keeping the temperature of the bar in a heat treatment furnace at 540 ℃ for 2 hours, and quenching the bar in hot water at 80 ℃; aging treatment: and after the quenching treatment is finished, transferring the bar into a heat treatment furnace at the temperature of 150 ℃, preserving the heat for 12 hours, and cooling in air.
Preferably, the aluminum alloy is an Al-Mg-Si-based aluminum alloy.
Preferably, the aluminum alloy is a356 aluminum alloy, ZL101 aluminum alloy, ZL102 aluminum alloy, and ZL104 aluminum alloy.
The beneficial technical effects of the invention comprise: the crystal grains of the aluminum alloy are refined, so that the aluminum alloy with more excellent mechanical property is obtained, and the requirement of the aluminum alloy wheel material is met. The refiner improves the strength and plasticity of the aluminum alloy, which is very suitable for manufacturing automobile wheels.
Drawings
FIG. 1 is an as-cast metallographic representation of test specimens of test groups A1-1, A2-1, A3-1, A4-1 and A5-1 of examples 1-5 of the present invention, i.e., samples of aluminum-yttrium-titanium amorphous ribbon master alloy added to A356 aluminum alloy, wherein (a) is the as-cast metallographic representation of the A1-1 sample of example 1, (b) is the as-cast metallographic representation of the A2-1 sample of example 2, (c) is the as-cast metallographic representation of the A3-1 sample of example 3, (d) is the as-cast metallographic representation of the A4-1 sample of example 4, and (e) is the as-cast metallographic representation of the A5-1 sample of example 5.
FIG. 2 is a graph of the mechanical properties of test groups A1-1, A2-1, A3-1, A4-1 and A5-1 of examples 1-5 of the present invention, i.e., an Al-Y-Ti amorphous ribbon master alloy added to an A356 aluminum alloy, wherein (a) is the tensile strength; graph (b) yield strength; FIG. C shows the elongation.
FIG. 3 is a DSC and XRD of the amorphous Al90Y8Ti2 (example one) added in the present invention, wherein (a) is DSC and (b) is XRD.
The specific implementation mode is as follows:
the present invention will be described in detail below by way of examples, which are provided for the convenience of understanding and are not intended to limit the present invention in any way.
Example 1
The invention relates to a Ti-containing amorphous master alloy refiner, which is characterized by comprising 90 atomic percent of Al, 8 atomic percent of Y and 2 atomic percent of Ti, and preparing Al90Y8Ti2 amorphous strip master alloy.
The preparation method of the Al90Y8Ti2 amorphous strip master alloy comprises the following steps:
(1) adding the simple substances of the various metals into an induction melting furnace or an electric arc melting furnace according to the proportion, and melting in an inert gas atmosphere. Preferably, smelting is carried out in an electric arc smelting furnace;
(2) putting the smelted master alloy into a quartz tube, and preparing the melt in the step (1) into a cylindrical or strip casting by using a copper mold casting or single-roller rotary quenching method; preferably, the step (2) uses a single-roller spinning method to prepare the melt into an alloy strip.
In the step (1), the master alloy is melted by induction heating, the temperature is kept above the melting point by 50-150 ℃, and the melted master alloy is sprayed onto a copper roller rotating at a high speed (the rotating speed is 3000-.
Example 2
The invention relates to a refiner of Ti-containing amorphous master alloy,
the Ti-containing amorphous master alloy refiner is characterized by comprising 88 atomic percent of Al, 8 atomic percent of Y and 4 atomic percent of Ti, and the Al88Y8Ti4 amorphous strip master alloy is prepared.
The preparation method of the Al88Y8Ti4 amorphous strip master alloy comprises the following steps:
(1) adding the simple substances of the various metals into an induction melting furnace or an electric arc melting furnace according to the proportion, and melting in an inert gas atmosphere. Preferably, smelting is carried out in an electric arc smelting furnace;
(2) putting the smelted master alloy into a quartz tube, and preparing the melt in the step (1) into a cylindrical or strip casting by using a copper mold casting or single-roller rotary quenching method; preferably, the step (2) uses a single-roller spinning method to prepare the melt into an alloy strip.
In the step (1), the master alloy is melted by induction heating, the temperature is kept above the melting point by 50-150 ℃, and the melted master alloy is sprayed onto a copper roller rotating at a high speed (the rotating speed is 3000-.
The amorphous strip master alloy obtained in the embodiment 1 and the embodiment 2 is respectively used for carrying out thinning treatment on the aluminum alloy by the following steps:
step one, smelting by using a crucible resistance furnace, wherein the smelting temperature is 800 ℃, respectively putting aluminum alloy at the temperature and preserving heat for 10 minutes, stirring to ensure that the aluminum alloy is completely molten, and preserving heat for 10 minutes at 800 ℃ according to amorphous strip intermediate alloy with the mass percent of the aluminum alloy being 0.2%.
Step three, gravity casting: and after the heat preservation is finished, taking out the crucible, casting the aluminum melt into a cast iron mold, and naturally cooling the aluminum melt into a bar.
And step four, carrying out T6 heat treatment (namely carrying out aging treatment after solution treatment) on the bar in the cast iron die. The solid solution treatment is to keep the bar in a heat treatment furnace at 540 ℃ for 2 hours and carry out quenching treatment in hot water at 80 ℃. And the aging treatment is to transfer the bar into a heat treatment furnace at 150 ℃ for heat preservation for 12 hours after the quenching treatment is finished, and air-cool the bar.
The aluminum alloy comprises the following raw materials:
aluminum alloy 1: commercial a356 aluminum alloy;
aluminum alloy 2: commercial ZL101 aluminum alloy;
aluminum alloy 3: commercial ZL102 aluminum alloy;
aluminum alloy 4: commercial ZL104 aluminum alloy.
The refinement was carried out according to the process parameters shown in table 1, the unspecified parameters of the table being as described above and being identical in the individual test groups.
Table 1: process conditions for refining aluminum alloys in examples 1 and 2
Test group number
Aluminum alloy refiner
Aluminium alloy
Mass percent of refiner in aluminum alloy%
A1-1
Refiner A
Aluminium alloy 1
0.2
A2-1
Refiner A
Aluminium alloy 2
0.2
A3-1
Refiner A
Aluminium alloy 3
0.2
A4-1
Refiner A
Aluminium alloy 4
0.2
B1-1
Refiner B
Aluminium alloy 1
0.2
B2-1
Refiner B
Aluminium alloy 2
0.2
B3-1
Refiner B
Aluminium alloy 3
0.2
B4-1
Refiner B
Aluminium alloy 4
0.2
Metallographic examination was performed on the sample obtained in the third step of test group a1-1 using an olympus metallographic microscope GX51, and the results are shown in fig. 1 (a), and tensile mechanical properties of the sample obtained in the third step were measured using a WDW-20 universal mechanical testing machine at a tensile rate of 0.5 mm/min, as shown in fig. 2 (a), (b), and (c). As shown in FIG. 2, the tensile strength was 194.21 MPa, the yield strength was 96.95 MPa, and the elongation was 9.3%. The data show that the aluminum alloy refined according to the method of example 1 and using refiner a of the present invention has a higher tensile strength, a higher yield strength and maintains the desired elongation level compared to the prior art refined aluminum alloy.
The samples of the remaining test groups were also metallographically examined using an olympus metalloscope GX 51. The result shows that the cast structure dendrites in the groups are fine and uniform, are in a strip shape and are distributed in a dendrite shape, and a good refining effect is achieved. The metallographic examination of the above groups is not shown. At the same time, the tensile strength, yield strength and elongation were tested on the specimens of each test group. The test result shows that each mechanical parameter is obviously improved compared with that before the refinement, and the method can be completely applied to the industry.
Meanwhile, the aluminum alloy refiner in the embodiment has better quality stability, and is easy to achieve repeatability and stability in process. Therefore, the aluminum alloy refiner in the embodiment also overcomes the defects of the aluminum alloy refiner in the prior art.
Example 3
The method adopts amorphous strip master alloy to carry out the following steps of thinning treatment on the aluminum alloy:
step one, preparing the amorphous strip intermediate alloy, as in the first embodiment.
Step two, smelting and refining, wherein the step two is different from the step one in the embodiment one only in that the mass percent of the added amorphous strip master alloy is changed from 0.2% to 0.4%.
Step three, gravity casting, the same as the first embodiment.
And step four, carrying out T6 heat treatment on the bar in the cast iron die, which is the same as the first embodiment.
The refinement was carried out according to the process parameters shown in table 2, where the unspecified parameters are as described above and are identical in the individual test groups.
Table 2: process condition for refining aluminium alloy
Test group number
Aluminum alloy refiner
Aluminium alloy
Mass percent of refiner in aluminum alloy%
A1-2
Refiner A
Aluminium alloy 1
0.4
A2-2
Refiner A
Aluminium alloy 2
0.4
A3-2
Refiner A
Aluminium alloy 3
0.4
A4-2
Refiner A
Aluminium alloy 4
0.4
B1-2
Refiner B
Aluminium alloy 1
0.4
B2-2
Refiner B
Aluminium alloy 2
0.4
B3-2
Refiner B
Aluminium alloy 3
0.4
B4-2
Refiner B
Aluminium alloy 4
0.4
The sample obtained in step three was examined metallographically, and the results of test group A1-2 are shown in FIG. 1 (b). And (c) carrying out tensile mechanical property test on the sample prepared in the third step, wherein (a), (b) and (c) are shown in figure 2. In the group A1-0.4 of example 2, the crystal grains of the as-cast structure were not further refined, and the tensile strength was 190.545 MPa, the yield strength was 93.9 MPa, and the elongation was 8.65%.
And (4) performing the same metallographic detection and mechanical property test on the rest samples obtained in the step three, wherein the result shows that the refining effect is more remarkable than that before the proportion is adjusted, and good mechanical property can be obtained.
Example 4
The method adopts amorphous strip master alloy to carry out the following steps of thinning treatment on the aluminum alloy:
step one, preparing the amorphous strip intermediate alloy, as in the first embodiment.
Step two, smelting and refining, wherein the step two is different from the step one in the embodiment one only in that the mass percent of the added amorphous strip master alloy is changed from 0.2% to 0.6%.
Step three, gravity casting, the same as the first embodiment.
And step four, carrying out T6 heat treatment on the bar in the cast iron die, which is the same as the first embodiment.
The refinement was carried out according to the process parameters shown in table 3, where the unspecified parameters are as described above and are identical in the individual test groups.
Table 3: process condition for refining aluminium alloy
Test group number
Aluminum alloy refiner
Aluminium alloy
Mass percent of refiner in aluminum alloy%
A1-3
Refiner A
Aluminium alloy 1
0.6
A2-3
Refiner A
Aluminium alloy 2
0.6
A3-3
Refiner A
Aluminium alloy 3
0.6
A4-3
Refiner A
Aluminium alloy 4
0.6
B1-3
Refiner B
Aluminium alloy 1
0.6
B2-3
Refiner B
Aluminium alloy 2
0.6
B3-3
Refiner B
Aluminium alloy 3
0.6
B4-3
Refiner B
Aluminium alloy 4
0.6
Metallographic examination was performed on the sample obtained in the third step, and the results of test group a1-3 are shown in (c) of fig. 1, and tensile mechanical property tests were performed on the sample obtained in the third step, as shown in (a), (b), and (c) of fig. 2. In the test group A1-3 of example 3, the change in the crystal grain size was insignificant and the number of secondary dendrites was increased as shown in FIG. 1 (c) in comparison with example 1, and as shown in FIG. 2, the tensile strength was 185.245 MPa, the yield strength was 91.4 MPa, and the elongation was 7.55%.
The test results of the samples of other test groups show that the grain size change is not obvious, the number of secondary dendrites is increased, and the tensile strength, the yield strength and the elongation are obviously improved compared with those before the thinning treatment.
Example 5
The method adopts amorphous strip master alloy to carry out the following steps of thinning treatment on the aluminum alloy:
step one, preparing the amorphous strip intermediate alloy, as in the first embodiment.
Step two, smelting and refining, wherein the step two is different from the step one in the embodiment one only in that the heat preservation time at 800 ℃ is changed from 10 minutes to 5 minutes after the aluminum alloy refiner is added.
Step three, gravity casting, the same as the first embodiment.
And step four, carrying out T6 heat treatment on the bar in the cast iron die, which is the same as the first embodiment.
The refinement was carried out according to the process parameters shown in table 4, where the unspecified parameters are as described above and are identical in the individual test groups.
Table 4: process condition for refining aluminium alloy
Test group number
Aluminum alloy refiner
Aluminium alloy
Incubation time/min
A1-4
Refiner A
Aluminium alloy 1
5
A2-4
Refiner A
Aluminium alloy 2
5
A3-4
Refiner A
Aluminium alloy 3
5
A4-4
Refiner A
Aluminium alloy 4
5
B1-4
Refiner B
Aluminium alloy 1
5
B2-4
Refiner B
Aluminium alloy 2
5
B3-4
Refiner B
Aluminium alloy 3
5
B4-4
Refiner B
Aluminium alloy 4
5
Metallographic examination was performed on the sample obtained in the third step, and the results of test group a1-4 are shown in fig. 1 (d), and tensile mechanical properties of the sample obtained in the third step are shown in fig. 2 (a), (b), and (c). As shown in FIG. 2, the tensile strength of the test piece of test group A1-4 of example 4 was 225.94 MPa, the yield strength was 100.15 MPa, and the elongation was 9.7%.
The test pieces of other test groups are also tested, and the results show that the crystal grains are coarsened, but the tensile strength, the yield strength and the elongation are obviously improved compared with those before the thinning treatment.
Example 6
The method adopts amorphous strip master alloy to carry out the following steps of thinning treatment on the aluminum alloy:
step one, preparing the amorphous strip intermediate alloy, as in the first embodiment.
Step two, smelting and refining, wherein the step two is different from the step one in the embodiment one only in that the heat preservation time at 800 ℃ is changed from 10 minutes to 20 minutes after the aluminum alloy refiner is added.
Step three, gravity casting, the same as the first embodiment.
And step four, carrying out T6 heat treatment on the bar in the cast iron die, which is the same as the first embodiment.
The refinement was carried out according to the process parameters shown in table 5, where the unspecified parameters are as described above and are identical in the individual test groups.
Table 5: process condition for refining aluminium alloy
Test group number
Aluminum alloy refiner
Aluminium alloy
Incubation time/min
A1-5
Refiner A
Aluminium alloy 1
20
A2-5
Refiner A
Aluminium alloy 2
20
A3-5
Refiner A
Aluminium alloy 3
20
A4-5
Refiner A
Aluminium alloy 4
20
B1-5
Refiner B
Aluminium alloy 1
20
B2-5
Refiner B
Aluminium alloy 2
20
B3-5
Refiner B
Aluminium alloy 3
20
B4-5
Refiner B
Aluminium alloy 4
20
Metallographic examination was performed on the sample obtained in the third step, and the results of test group a1-5 are shown in fig. 1 (e), and tensile mechanical properties of the sample obtained in the third step are shown in fig. 2 (a), (b), and (c). The tensile strength of the test specimen of test group A1-5 of example 5 was 215.855 MPa, the yield strength was 97.95 MPa, and the elongation was 9.15%.
Meanwhile, metallographic detection and tensile mechanical property test are carried out on the samples of other test groups. The results showed that the crystal grains became larger and the eutectic structure became larger. However, the tensile strength and yield strength are still improved over prior treatments.
In conclusion, the best addition amount of the AlYTi amorphous intermediate alloy in the A356 aluminum alloy is 0.2%; the optimal incubation time after addition of the refiner was 5 minutes.
The invention is described by the above combined experimental drawings, but the above specific embodiment is only a part of experiments and is not intended to limit the scope of the invention. Equivalent variations and related modifications of this invention can be made by those skilled in the art without departing from the spirit of this invention, and are intended to be within the scope of this invention.
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