CN109022857B - Method for increasing recrystallization temperature of aluminum alloy - Google Patents

Method for increasing recrystallization temperature of aluminum alloy Download PDF

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CN109022857B
CN109022857B CN201810933090.8A CN201810933090A CN109022857B CN 109022857 B CN109022857 B CN 109022857B CN 201810933090 A CN201810933090 A CN 201810933090A CN 109022857 B CN109022857 B CN 109022857B
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刘守法
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Dragon Totem Technology Hefei Co ltd
Hunan Jinzhida Metal Material Technology Co.,Ltd.
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Xijing University
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/026—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent

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Abstract

The invention provides a method for increasing the recrystallization temperature of an aluminum alloy, which comprises the following steps: melting pure aluminum and other metals, introducing Ar gas, removing an oxide layer and impurities on the surface of the molten liquid by gently stirring after the pure aluminum and the other metals are completely melted, then casting to form an ingot, and performing water quenching after the ingot is contracted; and carrying out solution treatment, hot rolling, cold rolling and annealing on the cast ingot after water quenching to form a new alloy. According to the invention, by adding the dispersed phase, carrying out solid solution treatment and combining two-stage rolling, the recrystallization temperature of the alloy can be effectively improved, and recrystallization and grain growth in later annealing treatment are avoided, so that the mechanical property of the alloy is favorably improved.

Description

Method for increasing recrystallization temperature of aluminum alloy
Technical Field
The invention relates to the technical field of materials, in particular to a method for improving the recrystallization temperature of aluminum alloy.
Background
The Al-Zn-Mg-Cu aluminum alloy is an aluminum alloy material developed according to the requirement of aerospace materials, and is widely used for manufacturing various high-strength structural members of airplanes and rockets. The aluminum alloy of the system is mainly used for improving the solid solubility supersaturation degree through aging precipitation strengthening, thereby improving the strengthening effect.
The Al-Zn-Mg-Cu aluminum alloy can improve the solubility of a precipitated phase by improving the solid solution temperature and prolonging the solid solution time, but simultaneously, the crystal grains of the alloy grow up, the recrystallization degree is improved, and the comprehensive performance of the alloy is reduced. Researchers investigated Cu content and degree of recrystallization versus AlZn2MgxThe influence of the corrosion fatigue strength of the Cu-T651 alloy is considered to increase as the Cu content and the degree of recrystallization decrease. The effect of Zr and hot rolling processes on the degree of recrystallization of AA7010 aluminium alloys has also been studied, with studies considering that the degree of recrystallization of the alloys decreases with increasing Zr content and increasing hot rolling temperature. The structural changes of the Al-Zn-Mg-Cu- (Sc) and AA7075 alloys in hot extrusion and subsequent heat treatment have also been studied, and it is believed that the structures of both alloys undergo recovery and recrystallization during heat treatment, resulting in grain growth.
Al-Zn-Mg-Cu aluminum alloy is aging strengthening alloy, and the solution treatment is an important process for improving the performance of the alloy. The high degree of supersaturation can be obtained by solution treatment, the dispersed phase is precipitated in the subsequent quenching process, but recrystallization can often occur in the alloy, the crystal grain is grown, and the strength, the plasticity and the stress corrosion resistance of the alloy are influenced.
The defects and shortcomings of the prior art are as follows:
1. the Al-Zn-Mg-Cu aluminum alloy is strengthened through aging treatment, which can cause tissue recovery and recrystallization, and lead to grain growth, thereby reducing the comprehensive mechanical property of the alloy;
2. the Al-Zn-Mg-Cu aluminum alloy processed by the rolling process can refine grains, but the subsequent annealing treatment can also cause the grains to grow large, thereby reducing the comprehensive mechanical property.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for increasing the recrystallization temperature of an aluminum alloy.
A method of increasing the recrystallization temperature of an aluminum alloy, comprising the steps of:
step 1: melting pure aluminum and other metals, introducing Ar gas, removing an oxide layer and impurities on the surface of the melt by gently stirring after the pure aluminum and other metals are completely melted, then quickly casting the melt into a steel mould preheated to 200 ℃ to form an ingot, and performing water quenching after the ingot is shrunk;
step 2; solution treatment: placing the alloy cast ingot in an air furnace at 300 ℃ for heat preservation for 12 hours, then increasing the temperature to 470 ℃ for heat preservation for 12 hours, taking out the alloy cast ingot and then quenching the alloy cast ingot with water to room temperature;
and step 3: hot rolling: firstly, heating the alloy with the thickness of about 10mm after aging treatment at 500 ℃ for 15 minutes, then carrying out hot rolling at the rolling speed of about 200mm/s and the rolling reduction of about 2mm in each pass, heating the alloy plate again at 500 ℃ for 2 minutes after finishing the rolling of one pass so as to maintain the high-temperature state of the alloy, repeatedly rolling, and rolling the plate to the thickness of 4mm with the total rolling reduction rate of 60 percent;
step 4; cold rolling: rolling the alloy with the thickness of 4mm after hot rolling on a rolling mill at the room temperature at the speed of 100mm/s, wherein the reduction rate of each pass is 1mm, the thickness of the alloy is changed into 2mm after two passes of rolling, and the reduction rate of cold rolling is 50%;
and 5: keeping the temperature in a resistance furnace for 1-2 hours, and quenching the steel plate to room temperature by water after the steel plate is taken out of the furnace.
Further, the method of increasing the recrystallization temperature of an aluminum alloy as described above, the other metal being pure copper, pure zinc, pure copper or pure magnesium, and an intermediate alloy of Al-15 wt.% Zr, Al-2 wt.% Sc, and Al-60 wt.% Mn.
Further, in the method for increasing the recrystallization temperature of the aluminum alloy as described above, the rolling speed in step 3 is 200mm/s, and the reduction amount per pass is 2 mm.
Has the advantages that:
by adding dispersed phases, carrying out solid solution treatment and combining two-stage rolling, the recrystallization temperature of the alloy can be effectively improved, and recrystallization and grain growth in later annealing treatment are avoided, so that the mechanical property of the alloy is improved.
Drawings
FIG. 1 is an electron microscope image of 7050 alloy after annealing at 450 ℃ in example 1 of the present invention;
FIG. 2 is an electron microscope image of 7050-Mn alloy after annealing at 475 ℃ in example 2 of the present invention;
FIG. 3 is an electron microscope image of 7050-Zr alloy after annealing at 475 ℃ in example 3 of the present invention;
FIG. 4 is an electron microscope image of 7050-Sc alloy annealed at 550 ℃ in example 4 of the present invention;
FIG. 5 is an electron microscope image of 7050-X alloy after annealing at 550 ℃ in example 5 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The experimental materials were pure aluminum (purity 99.99%), pure zinc (purity 99.99%), pure copper (purity 99.9%), pure magnesium (purity 99.9%), and master alloys of Al-15 wt.% Zr, Al-2 wt.% Sc, and Al-60 wt.% Mn.
Putting pure aluminum, pure copper and corresponding intermediate alloy into a resistance furnace for smelting at the smelting temperature of about 850 ℃, adding pure zinc and pure magnesium after the pure aluminum, the pure copper and the corresponding intermediate alloy are molten, then introducing Ar gas for 10min to remove air, removing an oxide layer and impurities on the surface of molten liquid by gently stirring after the pure aluminum, the pure copper and the corresponding intermediate alloy are completely molten, then quickly casting the molten liquid into a steel mold preheated to 200 ℃ to form an ingot, and performing water quenching after the ingot is contracted (about 5-10 seconds) to avoid a large amount of dispersed phases from being separated out during condensation. The components of the alloy prepared and smelted by adding the materials according to a certain proportion are shown in Table 1.
TABLE 1
Code number Zn Mg Cu Fe Mn Zr Sc Al
7050 6.15 2.12 2.06 0.11 - - - Balance of
7050-Mn 6.16 2.19 2.00 0.05 0.44 - - Balance of
7050-Sc 6.43 2.33 2.10 0.12 - - 0.23 Balance of
7050-Zr 6.21 2.23 2.13 0.13 - 0.23 - Balance of
7050-X 6.16 2.35 2.11 0.06 0.44 0.24 0.24 Balance of
Solution treatment: firstly, placing the alloy ingot in an air furnace at 300 ℃ for heat preservation for 12 hours, then adjusting the temperature to 470 ℃ for heat preservation for 12 hours, taking out the alloy ingot and then quenching the alloy ingot with water to room temperature.
Hot rolling: firstly heating the alloy with the thickness of about 10mm after aging treatment at 500 ℃ for 15 minutes, then carrying out hot rolling at the rolling speed of about 200mm/s and the rolling reduction of about 2mm in each pass, heating the alloy plate again at 500 ℃ for 2 minutes after finishing the rolling of one pass so as to maintain the high-temperature state of the alloy, repeatedly rolling, and rolling the plate to the thickness of 4mm with the total rolling reduction of 60%.
Cold rolling: and (3) rolling the alloy with the thickness of about 4mm after hot rolling on a rolling mill at the room temperature at the speed of 100mm/s, wherein the reduction rate of each pass is 1mm, the thickness of the alloy is changed into 2mm after two passes of rolling, and the reduction rate of cold rolling is 50%.
Example 1
The experimental materials were pure aluminum (purity 99.99%), pure zinc (purity 99.99%), pure copper (purity 99.9%), and pure magnesium (purity 99.9%).
Putting pure aluminum and pure copper into a resistance furnace for smelting at the smelting temperature of about 850 ℃, adding pure zinc and pure magnesium after the pure aluminum and the pure copper are molten, then introducing Ar gas for 10min to remove air, removing an oxide layer and impurities on the surface of molten liquid by gently stirring after the pure aluminum and the pure copper are completely molten, then quickly casting the molten liquid into a steel mould preheated to 200 ℃ to form a 7050 alloy ingot, and performing water quenching after the ingot is contracted (about 5-10 seconds) to avoid a large amount of dispersed phases from being separated out during condensation.
Solution treatment: firstly, placing the alloy ingot in an air furnace at 300 ℃ for heat preservation for 12 hours, then adjusting the temperature to 470 ℃ for heat preservation for 12 hours, taking out the alloy ingot and then quenching the alloy ingot with water to room temperature.
Hot rolling: firstly heating the alloy with the thickness of about 10mm after aging treatment at 500 ℃ for 15 minutes, then carrying out hot rolling at the rolling speed of about 200mm/s and the rolling reduction of about 2mm in each pass, heating the alloy plate again at 500 ℃ for 2 minutes after finishing the rolling of one pass so as to maintain the high-temperature state of the alloy, repeatedly rolling, and rolling the plate to the thickness of 4mm with the total rolling reduction of 60%.
Cold rolling: and (3) rolling the alloy with the thickness of about 4mm after hot rolling on a rolling mill at the room temperature at the speed of 100mm/s, wherein the reduction rate of each pass is 1mm, the thickness of the alloy is changed into 2mm after two passes of rolling, and the reduction rate of cold rolling is 50%.
Annealing treatment: keeping the temperature in a resistance furnace for 1-2 hours at 400 ℃, 425 ℃, 450 ℃, 475 ℃, 500 ℃, 525 ℃ and 550 ℃, and quenching the steel plate to room temperature by water after the steel plate is taken out of the furnace. Microscopic structure observation shows that the 7050 alloy annealed at 450 ℃ has been completely recrystallized, and the crystal grains of the alloy annealed at 500 ℃ are seriously grown.
Example 2
The experimental materials were pure aluminum (purity 99.99%), pure zinc (purity 99.99%), pure copper (purity 99.9%), pure magnesium (purity 99.9%), and master alloy Al-60 wt.% Mn.
Putting pure aluminum, pure copper and Al-60 wt.% Mn into a resistance furnace for smelting at the smelting temperature of about 850 ℃, adding pure zinc and pure magnesium after the pure aluminum, the pure copper and the Al-60 wt.% Mn are molten, introducing Ar gas for 10min to remove air, removing an oxide layer and impurities on the surface of a molten liquid by gently stirring after the pure aluminum, the pure copper and the Al-60 wt.% Mn are completely molten, quickly casting the molten liquid into a steel mold preheated to 200 ℃ to form a 7050-Mn alloy ingot, and performing water quenching after the ingot is contracted (about 5-10 seconds) to avoid a large amount of dispersed phases from being separated out during condensation.
Solution treatment: firstly, placing the alloy ingot in an air furnace at 300 ℃ for heat preservation for 12 hours, then adjusting the temperature to 470 ℃ for heat preservation for 12 hours, taking out the alloy ingot and then quenching the alloy ingot with water to room temperature.
Hot rolling: firstly heating the alloy with the thickness of about 10mm after aging treatment at 500 ℃ for 15 minutes, then carrying out hot rolling at the rolling speed of about 200mm/s and the rolling reduction of about 2mm in each pass, heating the alloy plate again at 500 ℃ for 2 minutes after finishing the rolling of one pass so as to maintain the high-temperature state of the alloy, repeatedly rolling, and rolling the plate to the thickness of 4mm with the total rolling reduction of 60%.
Cold rolling: and (3) rolling the alloy with the thickness of about 4mm after hot rolling on a rolling mill at the room temperature at the speed of 100mm/s, wherein the reduction rate of each pass is 1mm, the thickness of the alloy is changed into 2mm after two passes of rolling, and the reduction rate of cold rolling is 50%.
Annealing treatment: keeping the temperature in a resistance furnace for 1-2 hours at 400 ℃, 425 ℃, 450 ℃, 475 ℃, 500 ℃, 525 ℃ and 550 ℃, and quenching the steel plate to room temperature by water after the steel plate is taken out of the furnace. The observation of the microstructure shows that the 7050-Mn alloy is completely recrystallized at 475 ℃ and the crystal grains do not grow up until 500 ℃.
Example 3
The experimental materials were pure aluminum (purity 99.99%), pure zinc (purity 99.99%), pure copper (purity 99.9%), pure magnesium (purity 99.9%), and master alloy Al-15 wt.% Zr.
Putting pure aluminum, pure copper and Al-15 wt.% Zr into a resistance furnace for smelting at the smelting temperature of about 850 ℃, adding pure zinc and pure magnesium after the pure aluminum, the pure copper and the Al-15 wt.% Zr are molten, then introducing Ar gas for 10min to remove air, removing an oxide layer and impurities on the surface of a molten liquid by gently stirring after the pure aluminum, the pure copper and the Al-15 wt.% Zr are completely molten, then quickly casting the molten liquid into a steel mould preheated to 200 ℃ to form a 7050-Zr alloy ingot, and performing water quenching after the ingot is contracted (about 5-10 seconds) to avoid a large amount of dispersed phases from being separated out during condensation.
Solution treatment: firstly, placing the alloy ingot in an air furnace at 300 ℃ for heat preservation for 12 hours, then adjusting the temperature to 470 ℃ for heat preservation for 12 hours, taking out the alloy ingot and then quenching the alloy ingot with water to room temperature.
Hot rolling: firstly heating the alloy with the thickness of about 10mm after aging treatment at 500 ℃ for 15 minutes, then carrying out hot rolling at the rolling speed of about 200mm/s and the rolling reduction of about 2mm in each pass, heating the alloy plate again at 500 ℃ for 2 minutes after finishing the rolling of one pass so as to maintain the high-temperature state of the alloy, repeatedly rolling, and rolling the plate to the thickness of 4mm with the total rolling reduction of 60%.
Cold rolling: and (3) rolling the alloy with the thickness of about 4mm after hot rolling on a rolling mill at the room temperature at the speed of 100mm/s, wherein the reduction rate of each pass is 1mm, the thickness of the alloy is changed into 2mm after two passes of rolling, and the reduction rate of cold rolling is 50%.
Annealing treatment: keeping the temperature in a resistance furnace for 1-2 hours at 400 ℃, 425 ℃, 450 ℃, 475 ℃, 500 ℃, 525 ℃ and 550 ℃, and quenching the steel plate to room temperature by water after the steel plate is taken out of the furnace. Microscopic observation shows that the 7050-Zr alloy is completely recrystallized at 475 ℃ and crystal grains do not grow until 500 ℃.
Example 4
The experimental materials were pure aluminum (purity 99.99%), pure zinc (purity 99.99%), pure copper (purity 99.9%), pure magnesium (purity 99.9%) and master alloy Al-2 wt.% Sc.
Putting pure aluminum, pure copper and Al-2 wt.% Sc into a resistance furnace for smelting at the smelting temperature of about 850 ℃, adding pure zinc and pure magnesium after the materials are molten, then introducing Ar gas for 10min to remove air, removing an oxide layer and impurities on the surface of a molten liquid by gently stirring after the materials are completely molten, then quickly casting the molten liquid into a steel mould preheated to 200 ℃ to form a 7050-Sc alloy ingot, and performing water quenching after the ingot is contracted (about 5-10 seconds) to avoid a large amount of dispersed phases from being separated out during condensation.
Solution treatment: firstly, placing the alloy ingot in an air furnace at 300 ℃ for heat preservation for 12 hours, then adjusting the temperature to 470 ℃ for heat preservation for 12 hours, taking out the alloy ingot and then quenching the alloy ingot with water to room temperature.
Hot rolling: firstly heating the alloy with the thickness of about 10mm after aging treatment at 500 ℃ for 15 minutes, then carrying out hot rolling at the rolling speed of about 200mm/s and the rolling reduction of about 2mm in each pass, heating the alloy plate again at 500 ℃ for 2 minutes after finishing the rolling of one pass so as to maintain the high-temperature state of the alloy, repeatedly rolling, and rolling the plate to the thickness of 4mm with the total rolling reduction of 60%.
Cold rolling: and (3) rolling the alloy with the thickness of about 4mm after hot rolling on a rolling mill at the room temperature at the speed of 100mm/s, wherein the reduction rate of each pass is 1mm, the thickness of the alloy is changed into 2mm after two passes of rolling, and the reduction rate of cold rolling is 50%.
Annealing treatment: keeping the temperature in a resistance furnace for 1-2 hours at 400 ℃, 425 ℃, 450 ℃, 475 ℃, 500 ℃, 525 ℃ and 550 ℃, and quenching the steel plate to room temperature by water after the steel plate is taken out of the furnace. Microscopic structure observation shows that the 7050-Sc alloy is completely recrystallized at 550 ℃, and the crystal grains do not grow.
Example 5
The experimental materials are pure aluminum (purity 99.99%), pure zinc (purity 99.99%), pure copper (purity 99.9%), pure magnesium (purity 99.9%), and intermediate alloys of Al-15 wt.% Zr, Al-2 wt.% Sc, and Al-60 wt.% Mn.
Putting pure aluminum, pure copper and an intermediate alloy into a resistance furnace for smelting at the smelting temperature of about 850 ℃, adding pure zinc and pure magnesium after the pure aluminum, the pure copper and the intermediate alloy are molten, then introducing Ar gas for 10min to remove air, removing an oxide layer and impurities on the surface of a molten liquid by gently stirring after the pure aluminum, the pure copper and the intermediate alloy are completely molten, then quickly casting the molten liquid into a steel mold preheated to 200 ℃ to form a 7050-X alloy ingot, and performing water quenching after the ingot is contracted (about 5-10 seconds) to avoid a large amount of dispersed phases from being separated out during condensation.
Solution treatment: firstly, placing the alloy ingot in an air furnace at 300 ℃ for heat preservation for 12 hours, then adjusting the temperature to 470 ℃ for heat preservation for 12 hours, taking out the alloy ingot and then quenching the alloy ingot with water to room temperature.
Hot rolling: firstly heating the alloy with the thickness of about 10mm after aging treatment at 500 ℃ for 15 minutes, then carrying out hot rolling at the rolling speed of about 200mm/s and the rolling reduction of about 2mm in each pass, heating the alloy plate again at 500 ℃ for 2 minutes after finishing the rolling of one pass so as to maintain the high-temperature state of the alloy, repeatedly rolling, and rolling the plate to the thickness of 4mm with the total rolling reduction of 60%.
Cold rolling: and (3) rolling the alloy with the thickness of about 4mm after hot rolling on a rolling mill at the room temperature at the speed of 100mm/s, wherein the reduction rate of each pass is 1mm, the thickness of the alloy is changed into 2mm after two passes of rolling, and the reduction rate of cold rolling is 50%.
Annealing treatment: keeping the temperature in a resistance furnace for 1-2 hours at 400 ℃, 425 ℃, 450 ℃, 475 ℃, 500 ℃, 525 ℃ and 550 ℃, and quenching the steel plate to room temperature by water after the steel plate is taken out of the furnace. Microscopic observation shows that 50% recrystallization of the 7050-X alloy occurs at 550 ℃, and the crystal grains do not grow.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (2)

1. A method for increasing the recrystallization temperature of an aluminum alloy, comprising the steps of:
step 1: melting pure aluminum and other metals, introducing Ar gas, removing an oxide layer and impurities on the surface of the melt by gently stirring after the pure aluminum and other metals are completely melted, then quickly casting the melt into a steel mould preheated to 200 ℃ to form an ingot, and performing water quenching after the ingot is shrunk;
step 2; solution treatment: placing the alloy cast ingot in an air furnace at 300 ℃ for heat preservation for 12 hours, then increasing the temperature to 470 ℃ for heat preservation for 12 hours, taking out the alloy cast ingot and then quenching the alloy cast ingot with water to room temperature;
and step 3: hot rolling: firstly, heating the alloy with the thickness of about 10mm after aging treatment at 500 ℃ for 15 minutes, then carrying out hot rolling, heating the alloy plate at 500 ℃ again for 2 minutes after one pass of rolling, repeatedly rolling, and rolling the plate to the thickness of 4mm, wherein the total pressing rate is 60%;
step 4; cold rolling: rolling the alloy with the thickness of 4mm after hot rolling on a rolling mill at the room temperature at the speed of 100mm/s, wherein the reduction rate of each pass is 1mm, the thickness of the alloy is changed into 2mm after two passes of rolling, and the reduction rate of cold rolling is 50%;
and 5: preserving heat in a resistance furnace for 1-2 hours, and quenching with water to room temperature after discharging;
the other metals are pure copper, pure zinc and pure magnesium; or
Pure zinc, pure copper, pure magnesium, and master alloy Al-60 wt.% Mn; or
Pure zinc, pure copper, pure magnesium, and master alloy Al-15 wt.% Zr; or
Pure zinc, pure copper, pure magnesium, and master alloy Al-2 wt.% Sc; or
Pure zinc, pure copper, pure magnesium, master alloy Al-15 wt.% Zr, master alloy Al-2 wt.% Sc, and master alloy Al-60 wt.% Mn.
2. The method for increasing the recrystallization temperature of aluminum alloy according to claim 1, wherein the rolling speed in step 3 is 200mm/s, and the reduction per pass is 2 mm.
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