阅读说明：本技术 一种高熔点耐热变形铝合金及其制备方法 (High-melting-point heat-resistant aluminum alloy and preparation method thereof ) 是由 陶卫建 陈广川 薛烽 于 2020-05-21 设计创作，主要内容包括：本发明提供一种高熔点耐热变形铝合金及其制备方法,按照质量百分比计,所述铝合金的组成元素包括：Si 0.45～0.75％、Mg 0.80～1.20％、Mn 3.50～10.50％、Cu 0.40～0.80％以及Ti 0.01～0.05％,余量为铝以及杂质元素。所述铝合金熔点高,耐热性能优异,高温尺寸稳定性能优异,同时阳极氧化性能良好,可以得到外观精美的视觉效果。(The invention provides a high-melting-point heat-resistant deformation aluminum alloy and a preparation method thereof, wherein the aluminum alloy comprises the following components in percentage by mass: 0.45 to 0.75% of Si, 0.80 to 1.20% of Mg, 3.50 to 10.50% of Mn, 0.40 to 0.80% of Cu, 0.01 to 0.05% of Ti, and the balance of aluminum and impurity elements. The aluminum alloy has the advantages of high melting point, excellent heat resistance, excellent high-temperature dimensional stability and good anodic oxidation performance, and can obtain a visual effect with exquisite appearance.)

1. The high-melting-point heat-deformation-resistant aluminum alloy is characterized in that the aluminum alloy comprises the following components in percentage by mass: 0.45-0.75% of Si, 0.80-1.20% of Mg, 3.50-10.50% of Mn, 0.40-0.80% of Cu0.01-0.05% of Ti, and the balance of aluminum and impurity elements.

2. The aluminum alloy of claim 1, wherein the impurity elements include, in mass percent of the aluminum alloy, Fe ≦ 0.40%, Zn ≦ 0.05%, Cr ≦ 0.005%, Zr ≦ 0.005%, and inevitable impurity elements;

preferably, the mass percentage of any one element of the inevitable impurity elements does not exceed 0.05%.

3. A method for producing a high melting point, heat distortion resistant aluminium alloy according to claim 1 or 2, characterised in that the method comprises the steps of:

(1) melting an aluminum ingot, adding a silicon source, a magnesium source and a copper source, stirring an aluminum alloy liquid, blowing manganese salt into the aluminum alloy liquid, reacting while stirring, and performing deslagging treatment after reaction to obtain a first aluminum alloy liquid;

(2) refining the first aluminum alloy liquid obtained in the step (1) by using argon and a refining agent, standing and slagging off, and standing to obtain a second aluminum alloy liquid;

(3) adding an aluminum-titanium-boron alloy into the second aluminum alloy liquid obtained in the step (2) for refining, and then performing degassing filtration to obtain a third aluminum alloy liquid;

(4) and (3) performing semi-continuous casting on the third aluminum alloy liquid obtained in the step (2), performing homogenization treatment after first cooling, performing hot extrusion treatment after second cooling to room temperature, performing aging treatment after third cooling to room temperature, and performing fourth cooling to room temperature to obtain the high-melting-point heat-resistant deformation aluminum alloy.

4. The preparation method according to claim 3, wherein the temperature for melting the aluminum ingot in the step (1) is 730-760 ℃;

preferably, the silicon source of step (1) comprises crystalline silicon;

preferably, the magnesium source of step (1) comprises a magnesium ingot;

preferably, the copper source of step (1) comprises electrolytic copper;

preferably, the stirring of the aluminum alloy liquid after the silicon source, the magnesium source and the copper source are added in the step (1) is electromagnetic stirring;

preferably, the electromagnetic stirring time is 20-30 min.

5. The method according to claim 3 or 4, wherein the manganese salt of step (1) is anhydrous manganese chloride;

preferably, the time for blowing the manganese salt in the step (1) is 5-10 min;

preferably, the reaction time in the step (1) is 5-10 min;

preferably, the deslagging method in the step (1) comprises the steps of adopting a deslagging agent to perform blowing stirring, and removing molten aluminum dross on the surface;

preferably, the dosage of the slag removing agent is 1-1.5 kg of slag removing agent per ton of aluminum liquid.

6. The method according to any one of claims 3 to 5, wherein the argon gas in the step (2) is argon gas having a purity of not less than 99.9%;

preferably, the amount of the refining agent in the step (2) is 2-4 kg/ton of aluminum liquid;

preferably, the refining agent in the step (2) is a refining agent without sodium salt;

preferably, the sodium salt-free refining agent is NaCl, NaF and Na-free₂CO₃The refining agent of (4);

preferably, the refining time in the step (2) is 10-30 min;

preferably, the standing time before the slag skimming in the step (2) is 5-10 min;

preferably, the standing time after the slag skimming in the step (2) is 5-15 min.

7. The preparation method according to any one of claims 3 to 6, wherein the addition amount of the Al-Ti-B alloy in the step (3) is 2 to 6 kg/ton of molten aluminum;

preferably, the degassing and filtering treatment in the step (3) uses a degassing machine and a foamed ceramic filter plate or a tubular filter;

preferably, the rotation speed of a graphite rotor of the degasser is 100-200 rpm;

preferably, the argon flow of the degasser is 0.5-0.8 m³/h；

Preferably, the porosity of the foamed ceramic filter plate is 40-60 ppi;

preferably, the candle filter is of class B or higher.

8. The production method according to any one of claims 3 to 7, wherein the speed of the semi-continuous casting in step (4) is 50 to 70 mm/min;

preferably, the temperature of the third aluminum alloy liquid in the semi-continuous casting in the step (4) is 720-740 ℃;

preferably, the first cooling in the step (4) is strong water cooling, and the pressure of the cooling water is 0.5-0.8 MPa;

preferably, the temperature of the homogenization treatment in the step (4) is 575-590 ℃;

preferably, the time of the homogenization treatment in the step (4) is 12-24 h;

preferably, the second cooling in the step (4) is water mist forced cooling.

9. The production method according to any one of claims 3 to 8, wherein the hot extrusion treatment in the step (4) comprises heating to 500 to 540 ℃, and then extruding the aluminum alloy profile under conditions of a mold temperature of 430 to 450 ℃, an extrusion cylinder temperature of 440 to 470 ℃, an extrusion speed of 5 to 10m/min, and an extrusion ratio of 30 to 60;

preferably, the third cooling in the step (4) is strong water cooling, and the water temperature is not higher than 40 ℃;

preferably, the temperature of the aging treatment in the step (4) is 180-210 ℃;

preferably, the time of the aging treatment in the step (4) is 8-12 h;

preferably, the fourth cooling of step (4) is air cooling.

10. The method for preparing according to any one of claims 3 to 9, characterized in that it comprises the steps of:

(1) melting an aluminum ingot at 730-760 ℃, adding crystalline silicon, a magnesium ingot and electrolytic copper, electromagnetically stirring aluminum alloy liquid for 20-30 min, blowing anhydrous manganese chloride into the aluminum alloy liquid for 5-10 min, reacting for 5-10 min under stirring, blowing and stirring by using a slag removing agent after reaction, removing dross on surface aluminum liquid to obtain first aluminum alloy liquid, wherein the using amount of the slag removing agent is 1-1.5 kg of slag removing agent per ton of aluminum liquid;

(2) refining the first aluminum alloy liquid obtained in the step (1) by using argon with the purity not lower than 99.9% and a sodium salt-free refining agent for 10-30 min, then standing for 5-10 min for slagging off, and standing for 5-15 min to obtain a second aluminum alloy liquid, wherein the dosage of the refining agent is 2-4 kg/ton of aluminum liquid;

(3) adding an aluminum-titanium-boron alloy into the second aluminum alloy liquid obtained in the step (2) for refining, wherein the addition amount of the aluminum-titanium-boron alloy is 2-6 kg/ton of aluminum liquid, and then performing degassing filtration treatment to obtain a third aluminum alloy liquid;

the device used for degassing and filtering treatment comprises a degassing machine and a foamed ceramic filter plate or a tubular filter, the rotation speed of a graphite rotor of the degassing machine is 100-200 rpm, and the argon flow is 0.5-0.8 m³The porosity of the foamed ceramic filter plate is 40-60 ppi, and the tubular filter is of grade above B;

(4) performing semi-continuous casting on the third aluminum alloy liquid obtained in the step (2), wherein the temperature of the third aluminum alloy liquid is 720-740 ℃ during the semi-continuous casting, the speed of the semi-continuous casting is 50-70 mm/min, the homogenization treatment is carried out after the strong water cooling, the homogenization treatment is carried out at the temperature of 575-590 ℃ for 12-24 h, the water mist is forcibly cooled to room temperature and then is subjected to hot extrusion treatment, the hot extrusion treatment method comprises the steps of firstly heating to 500-540 ℃, and then extruding the aluminum alloy profile under the conditions that the temperature of a die is 430-450 ℃, the temperature of an extrusion cylinder is 440-470 ℃, the extrusion speed is 5-10 m/min, and the extrusion ratio is 30-60, cooling to room temperature, carrying out aging treatment, and air cooling to room temperature to obtain the high-melting-point heat-resistant deformation aluminum alloy, wherein the temperature of the aging treatment is 180-210 ℃, and the time is 8-12 hours.

Technical Field

The invention belongs to the field of alloy manufacturing, relates to an aluminum alloy and a preparation method thereof, and particularly relates to a high-melting-point heat-resistant deformation aluminum alloy and a preparation method thereof.

Background

Disclosure of Invention

In order to solve the technical problems in the prior art, the application provides the high-melting-point heat-resistant deformation-resistant aluminum alloy and the preparation method thereof.

In order to achieve the technical effect, the following technical scheme is adopted in the application:

one of the purposes of the invention is to provide a high-melting-point heat-deformation-resistant aluminum alloy, which comprises the following components in percentage by mass: 0.45 to 0.75% of Si, 0.80 to 1.20% of Mg, 3.50 to 10.50% of Mn, 0.40 to 0.80% of Cu, 0.01 to 0.05% of Ti, and the balance of aluminum and impurity elements.

The mass percentage of Si may be 0.50%, 0.55%, 0.60%, 0.65%, or 0.70%, the mass percentage of Mg may be 0.85%, 0.90%, 0.95%, 1.00%, 1.05%, 1.10%, or 1.15%, the mass percentage of Mn may be 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 6.50%, 7.00%, 7.50%, 8.00%, 8.50%, 9.00%, 9.50%, or 10.00%, the mass percentage of Cu may be 0.45%, 0.50%, 0.55%, 0.60%, 0.65%, 0.70%, or 0.75%, the mass percentage of Ti may be 0.015%, 0.02%, 0.025%, 0.03%, 0.035%, 0.04%, or 0.045%, but the values are not limited to the other values.

In a preferred embodiment of the present invention, the impurity elements include, in terms of mass% of the aluminum alloy, 0.40% or less of Fe, 0.05% or less of Zn, 0.005% or less of Cr, 0.005% or less of Zr, 0.30% or 0.35% or more of Fe, 0.01% or 0.02% or 0.03% or 0.04% or more of Zn, 0.001% or 0.002% or 0.003% or 0.004% of Cr, 0.001% or 0.002% or 0.003% or 0.004% of Zr, and the amount of Zr is not limited to the above-mentioned values, but other values not listed in the above-mentioned ranges are also applicable.

Preferably, the mass percentage of any one element of the inevitable impurity elements does not exceed 0.05%.

The second purpose of the invention is to provide a preparation method of the high-melting-point heat-resistant deformation-resistant aluminum alloy, which comprises the following steps:

(1) melting an aluminum ingot, adding a silicon source, a magnesium source and a copper source, stirring an aluminum alloy liquid, blowing manganese salt into the aluminum alloy liquid, reacting while stirring, and performing deslagging treatment after reaction to obtain a first aluminum alloy liquid;

(2) refining the first aluminum alloy liquid obtained in the step (1) by using argon and a refining agent, standing and slagging off, and standing to obtain a second aluminum alloy liquid;

(3) adding an aluminum-titanium-boron alloy into the second aluminum alloy liquid obtained in the step (2) for refining, and then performing degassing filtration to obtain a third aluminum alloy liquid;

(4) and (3) performing semi-continuous casting on the third aluminum alloy liquid obtained in the step (2), performing homogenization treatment after first cooling, performing hot extrusion treatment after second cooling to room temperature, performing aging treatment after third cooling to room temperature, and performing fourth cooling to room temperature to obtain the high-melting-point heat-resistant deformation aluminum alloy.

In a preferred embodiment of the present invention, the temperature at which the aluminum ingot is melted in step (1) is 730 to 760 ℃, for example 735 ℃, 740 ℃, 745 ℃, 750 ℃, or 755 ℃, but the melting temperature is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

Preferably, the silicon source of step (1) comprises crystalline silicon.

Preferably, the magnesium source of step (1) comprises a magnesium ingot.

Preferably, the copper source of step (1) comprises electrolytic copper.

Preferably, the stirring of the aluminum alloy liquid after the silicon source, the magnesium source and the copper source are added in the step (1) is electromagnetic stirring.

Preferably, the time period of the electromagnetic stirring is 20-30 min, such as 21min, 22min, 23min, 24min, 25min, 26min, 27min, 28min or 29min, but is not limited to the recited values, and other values not recited in the range of the recited values are also applicable.

In the present invention, the silicon source, magnesium source and copper source are not limited to those listed above, and may be other elements or compounds containing the above elements.

As a preferable technical scheme of the invention, the manganese salt in the step (1) is anhydrous manganese chloride.

Preferably, the time for blowing the manganese salt in step (1) is 5-10 min, such as 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, 8.5min, 9min or 9.5min, but not limited to the recited values, and other values not recited in the range of the values are also applicable.

Preferably, the reaction time in step (1) is 5-10 min, such as 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, 8.5min, 9min or 9.5min, but not limited to the recited values, and other values not recited in the range of the values are also applicable.

In the invention, MnCl is subjected to an in-situ alloying method₂Reacting with aluminum to obtain MnAl₂Phase in the form of fine round particles (diameter less than 20 μm) dispersed in α aluminum matrix, reacting with aluminum (or an aluminum-manganese master alloy produced in this way) by conventional manganese flake or powder addition, and obtaining coarse, hard and brittle AlMn₆Mesophases in the form of platelets or needles (length greater than 1000 μm). MnAl by in-situ alloying₂Phase, in particular AlMn, which has good deformation processability and is easily extruded or otherwise deformed, and more than 1000 μm₆The mesophase has poor processability.

Preferably, the deslagging method in the step (1) includes blowing and stirring by using a deslagging agent to remove aluminum liquid scum on the surface.

Preferably, the amount of the slag removing agent is 1 to 1.5kg of slag removing agent per ton of molten aluminum, such as 1.1kg of slag removing agent per ton of molten aluminum, 1.2kg of slag removing agent per ton of molten aluminum, 1.3kg of slag removing agent per ton of molten aluminum, or 1.4kg of slag removing agent per ton of molten aluminum, but not limited to the recited values, and other values not recited in the range of the values are also applicable.

In the present invention, after blowing anhydrous manganese chloride and removing dross, a sample was taken and subjected to spectral analysis to confirm whether or not the chemical composition satisfied the requirements (excluding Ti), and related elements were added and adjusted as necessary.

As a preferable technical scheme of the invention, the argon in the step (2) is argon with the purity of not less than 99.9 percent.

Preferably, the amount of the refining agent in the step (2) is 2 to 4 kg/ton of aluminum liquid, such as 2.2 kg/ton of aluminum liquid, 2.5 kg/ton of aluminum liquid, 2.8 kg/ton of aluminum liquid, 3 kg/ton of aluminum liquid, 3.2 kg/ton of aluminum liquid, 3.5 kg/ton of aluminum liquid or 3.8 kg/ton of aluminum liquid, but not limited to the enumerated values, and other unrecited values in the numerical range are also applicable.

Preferably, the refining agent in the step (2) is a refining agent without sodium salt.

Preferably, the sodium salt-free refining agent is NaCl, NaF and Na-free₂CO₃The refining agent of (4).

Preferably, the refining time in step (2) is 10-30 min, such as 12min, 15min, 18min, 20min, 22min, 25min or 28min, but not limited to the recited values, and other values not recited in the range of the values are also applicable.

Preferably, the time for standing before slagging-off in the step (2) is 5-10 min, such as 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, 8.5min, 9min or 9.5min, etc., but not limited to the recited values, and other values not recited in the range of the values are also applicable.

Preferably, the time for standing after slagging-off in the step (2) is 5-15 min, such as 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min or 14min, but not limited to the recited values, and other unrecited values in the range of the recited values are also applicable.

As a preferred technical scheme of the invention, the adding amount of the Al-Ti-B alloy in the step (3) is 2-6 kg/ton of molten aluminum, such as 2.5 kg/ton of molten aluminum, 3 kg/ton of molten aluminum, 3.5 kg/ton of molten aluminum, 4 kg/ton of molten aluminum, 4.5 kg/ton of molten aluminum, 5 kg/ton of molten aluminum or 5.5 kg/ton of molten aluminum, but not limited to the recited values, and other unrecited values in the range of the values are also applicable.

Preferably, the degassing and filtering treatment in the step (3) uses a degassing machine and a foamed ceramic filter plate or a tubular filter.

Preferably, the graphite rotor of the degasser has a rotation speed of 100-200 rpm, such as 110rpm, 120rpm, 130rpm, 140rpm, 150rpm, 160rpm, 170rpm, 180rpm, 190rpm, and the like, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.

Preferably, the argon flow of the degasser is 0.5-0.8 m³H, e.g. 0.55m³/h、0.6m³/h、0.65m³/h、0.7m³H or 0.75m³And/h, etc., but are not limited to the recited values, and other values not recited within the numerical range are equally applicable.

Preferably, the porosity of the ceramic foam filter plate is 40 to 60ppi, such as 42ppi, 45ppi, 48ppi, 50ppi, 52ppi, 55ppi or 58ppi, but not limited to the recited values, and other values not recited in this range are also applicable.

Preferably, the candle filter is of class B or higher.

As a preferred embodiment of the present invention, the speed of the semi-continuous casting in step (4) is 50 to 70mm/min, such as 52mm/min, 55mm/min, 58mm/min, 60mm/min, 62mm/min, 65mm/min or 68mm/min, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

Preferably, the temperature of the third aluminum alloy liquid in the semi-continuous casting in the step (4) is 720 to 740 ℃, such as 722 ℃, 725 ℃, 728 ℃, 730 ℃, 732 ℃, 735 ℃ or 738 ℃, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable.

Preferably, the first cooling in step (4) is forced water cooling, and the cooling water pressure is 0.5 to 0.8MPa, such as 0.55MPa, 0.6MPa, 0.65MPa, 0.7MPa or 0.75MPa, but not limited to the recited values, and other values not recited in the range of the values are also applicable.

Preferably, the temperature of the homogenization treatment in step (4) is 575-590 ℃, such as 576 ℃, 578 ℃, 580 ℃, 582 ℃, 585 ℃, 588 ℃, etc., but is not limited to the recited values, and other values not recited in the range of the values are also applicable.

Preferably, the time for the homogenization treatment in step (4) is 12-24 h, such as 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h or 23h, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.

In the invention, Mn element is added in an in-situ synthesis mode on the basis of strengthening elements such as Mg, Si, Cu and the like in the aluminum alloy to form MnAl₂The phase has good deformation processing capability, is easy to extrude or perform other deformation processing, and can enable more intermediate phases to be dissolved in α aluminum through high-temperature homogenization heat treatment, so that the solid-liquid line temperature is increased, and the temperature and heat resistance of the phase are improved.

Preferably, the second cooling in the step (4) is water mist forced cooling.

As a preferable technical scheme of the invention, the hot extrusion treatment method in the step (4) comprises the steps of heating to 500-540 ℃, and then extruding the aluminum alloy profile under the conditions that the temperature of a die is 430-450 ℃, the temperature of an extrusion cylinder is 440-470 ℃, the extrusion speed is 5-10 m/min, and the extrusion ratio is 30-60.

The temperature to which the heat is applied may be 505 ℃, 510 ℃, 515 ℃, 520 ℃, 525 ℃, 530 ℃ or 535 ℃, the mold temperature may be 432 ℃, 435 ℃, 438 ℃, 440 ℃, 442 ℃, 445 ℃ or 448 ℃, the extrusion barrel temperature may be 445 ℃, 450 ℃, 455 ℃, 460 ℃ or 465 ℃, the extrusion speed may be 6m/min, 7m/min, 8m/min or 9m/min, the extrusion ratio may be 35, 40, 45, 50 or 55, but the present invention is not limited to the above-mentioned values, and other values not listed in the above-mentioned values may be applied.

Preferably, the third cooling in step (4) is performed by forced water cooling, and the water temperature is not higher than 40 ℃, such as 15 ℃, 20 ℃, 25 ℃, 30 ℃ or 35 ℃, but not limited to the recited values, and other values not recited in the range of the values are also applicable.

Preferably, the temperature of the aging treatment in the step (4) is 180-210 ℃;

preferably, the time of the aging treatment in the step (4) is 8-12 h;

preferably, the fourth cooling of step (4) is air cooling.

In the invention, the used unit kg/ton of aluminum liquid refers to the aluminum liquid obtained after the aluminum ingot is melted in the step (1).

As a preferable technical scheme of the invention, the preparation method of the high-melting-point heat-resistant deformation-resistant aluminum alloy comprises the following steps:

(1) melting an aluminum ingot at 730-760 ℃, adding crystalline silicon, a magnesium ingot and electrolytic copper, electromagnetically stirring aluminum alloy liquid for 20-30 min, blowing anhydrous manganese chloride into the aluminum alloy liquid for 5-10 min, reacting for 5-10 min under stirring, blowing and stirring by using a slag removing agent after reaction, removing dross on surface aluminum liquid to obtain first aluminum alloy liquid, wherein the using amount of the slag removing agent is 1-1.5 kg of slag removing agent per ton of aluminum liquid;

(2) refining the first aluminum alloy liquid obtained in the step (1) by using argon with the purity not lower than 99.9% and a sodium salt-free refining agent for 10-30 min, then standing for 5-10 min for slagging off, and standing for 5-15 min to obtain a second aluminum alloy liquid, wherein the dosage of the refining agent is 2-4 kg/ton of aluminum liquid;

(3) adding an aluminum-titanium-boron alloy into the second aluminum alloy liquid obtained in the step (2) for refining, wherein the addition amount of the aluminum-titanium-boron alloy is 2-6 kg/ton of aluminum liquid, and then performing degassing filtration treatment to obtain a third aluminum alloy liquid;

the device used for degassing and filtering treatment comprises a degassing machine and a foamed ceramic filter plate or a tubular filter, the rotation speed of a graphite rotor of the degassing machine is 100-200 rpm, and the argon flow is 0.5-0.8 m³The porosity of the foamed ceramic filter plate is 40-60 ppi,the tubular filter is above grade B;

(4) performing semi-continuous casting on the third aluminum alloy liquid obtained in the step (2), wherein the temperature of the third aluminum alloy liquid is 720-740 ℃ during the semi-continuous casting, the speed of the semi-continuous casting is 50-70 mm/min, the homogenization treatment is carried out after the strong water cooling, the homogenization treatment is carried out at the temperature of 575-590 ℃ for 12-24 h, the water mist is forcibly cooled to room temperature and then is subjected to hot extrusion treatment, the hot extrusion treatment method comprises the steps of firstly heating to 500-540 ℃, and then extruding the aluminum alloy profile under the conditions that the temperature of a die is 430-450 ℃, the temperature of an extrusion cylinder is 440-470 ℃, the extrusion speed is 5-10 m/min, and the extrusion ratio is 30-60, cooling to room temperature, carrying out aging treatment, and air cooling to room temperature to obtain the high-melting-point heat-resistant deformation aluminum alloy, wherein the temperature of the aging treatment is 180-210 ℃, and the time is 8-12 hours.

Compared with the prior art, the invention has at least the following beneficial effects:

the invention provides a high-melting-point heat-resistant deformation-resistant aluminum alloy and a preparation method thereof, wherein the aluminum alloy is only added with high-temperature metal manganese, and after the preparation method is subjected to solution treatment, the melting point of the alloy is increased, the heat resistance is improved, the high-temperature dimensional stability is improved, meanwhile, the anodic oxidation performance is good, and the visual effect with exquisite appearance can be obtained; the tensile strength of the aluminum alloy reaches 330MPa at 250 ℃, and the yield strength of the aluminum alloy also reaches 280MPa

Detailed Description

For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.