CN114472860A - Gradient cooling method for improving quality of zinc-aluminum-magnesium alloy - Google Patents
Gradient cooling method for improving quality of zinc-aluminum-magnesium alloy Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 85
- -1 zinc-aluminum-magnesium Chemical compound 0.000 title claims abstract description 47
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 40
- 238000005266 casting Methods 0.000 claims abstract description 60
- 229910002058 ternary alloy Inorganic materials 0.000 claims abstract description 31
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 14
- 238000004321 preservation Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000010583 slow cooling Methods 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 33
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 30
- 229910052749 magnesium Inorganic materials 0.000 claims description 30
- 239000011777 magnesium Substances 0.000 claims description 30
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 27
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 26
- 239000012071 phase Substances 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 20
- 229910052725 zinc Inorganic materials 0.000 claims description 14
- 239000011701 zinc Substances 0.000 claims description 14
- 230000006911 nucleation Effects 0.000 claims description 11
- 238000010899 nucleation Methods 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 239000007791 liquid phase Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229910002056 binary alloy Inorganic materials 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 229910017706 MgZn Inorganic materials 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 229910003023 Mg-Al Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/064—Cooling the ingot moulds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a gradient cooling method for improving the quality of a zinc-aluminum-magnesium alloy, which comprises a first cooling stage and a second cooling stage, wherein the first cooling stage is that when the casting temperature of the alloy is 500-550 ℃, and a casting body with the temperature of more than 420 ℃ still exists in a casting ingot mould after the casting is finished, the casting ingot mould is cooled to 350-370 ℃ in the mould by adopting a rapid cooling means within 5-10 min, and then the rapid cooling is stopped immediately; and the second cooling stage is a heating slow cooling stage after the rapid cooling is stopped, a U-shaped double-pipe small gas nozzle is adopted for combustion and heat preservation, a closed heat preservation cover plate is covered, and after the temperature is reduced to 270-280 ℃, the high-power fan is used for rapidly cooling to the demolding. The invention can promote the ternary alloy phase in the zinc-aluminum-magnesium ternary alloy to be fully nucleated and formed, reduce the formation of a binary phase structure and produce the zinc-aluminum-magnesium ternary alloy with higher quality.
Description
Technical Field
The invention relates to the technical field of underwear, in particular to a gradient cooling method for improving the quality of a zinc-aluminum-magnesium alloy.
Background
At present, most of cooling forming means of hot galvanizing ternary alloys of Zn-6Al-3Mg are heating and slow cooling, after zinc-aluminum-magnesium alloy liquid enters a mould through casting, heating means such as fuel gas and the like are adopted, and solidification forming of the zinc-aluminum-magnesium alloy is promoted slowly and uniformly for 3-4 hours, so that under the conventional cooling means, according to analysis of a Zn-Al-Mg ternary alloy phase diagram, Al-rich phases, Mg-Al and other binary alloy phase structures in the solidified zinc-aluminum-magnesium alloy are increased, the phase components of the ternary alloy are greatly reduced, and the quality of the zinc-aluminum-magnesium ternary alloy is greatly influenced. Based on the method, the invention provides a gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy.
Disclosure of Invention
The invention aims to provide a gradient cooling method for improving the quality of a zinc-aluminum-magnesium alloy, which can promote the ternary alloy phase in the zinc-aluminum-magnesium ternary alloy to be fully nucleated and formed, and reduce the formation of a binary phase structure as much as possible so as to produce the zinc-aluminum-magnesium ternary alloy with higher quality.
In order to achieve the above purpose, the invention provides the following technical scheme:
a gradient cooling method for improving the quality of a zinc-aluminum-magnesium alloy is characterized in that a molten melt is cast into an ingot casting mold, the casting temperature is controlled to be 530-570 ℃, after casting is finished, the gradient cooling method is formulated according to a phase structure nucleation temperature interval of a Zn-6Al-3Mg ternary alloy, and the gradient cooling method comprises a first cooling stage and a second cooling stage, wherein the first cooling stage is that when the casting temperature of the alloy is 500-550 ℃, and a casting body with the temperature of more than 420 ℃ still exists in the ingot casting mold after casting is finished, the casting body is cooled to 350-370 ℃ in the mold within 5-10 min by adopting a rapid cooling means, and then the rapid cooling is stopped immediately; and the second cooling stage is a heating slow cooling stage after the rapid cooling is stopped, a U-shaped double-pipe small gas nozzle is adopted for combustion and heat preservation, a closed heat preservation cover plate is covered, and after the temperature is reduced to 270-280 ℃, the high-power fan is used for rapidly cooling to the demolding.
The temperature is reduced during the casting process, so that the cast body in the ingot casting mold is above 420 ℃ after the casting is finished.
In the prior art, the fuel gas heating means is directly adopted for slow cooling, so that the binary alloy phase structure in the Zn-6Al-3Mg ternary alloy can fully grow and nucleate, and the required ternary alloy phase is greatly reduced.
Furthermore, the time from the rapid cooling means to the demoulding is 1.5 to 2 hours. The zinc-aluminum-magnesium alloy has short cooling forming time, and the cooling forming time is reduced by about half compared with the cooling forming time in the prior art.
Furthermore, the rapid cooling means adopts a high-power fan for cooling. The high-power fan can perform rapid cooling, and the rapid cooling requirement of the invention is met. Besides the high-power fan, other rapid cooling means can be adopted.
Further, the casting process in the process keeps the slag dragging action. The slag dragging action is kept in the casting process, the incomplete dragging of the scum can be prevented when the zinc ingot, the aluminum ingot and the magnesium ingot are melted in the smelting process, and the purity of the smelted melt is improved.
Further, the nucleation temperature range of the Zn-6Al-3Mg ternary alloy phase structure is 270-360 ℃. According to the invention, the forming temperature interval of the Zn-6Al-3Mg ternary alloy phase is determined and obtained through the analysis of the ternary phase diagram of the Zn-6Al-3Mg ternary alloy.
Further, the smelting melt is prepared by the following method: smelting zinc in a zinc ingot at 480-520 ℃, fishing out floating slag after the zinc ingot is completely molten into a liquid phase, adding an aluminum ingot, raising the temperature to 580-620 ℃ to melt aluminum, fishing out floating slag on the surface of the aluminum ingot after the aluminum ingot is molten, reducing the temperature to about 500-540 ℃, preserving heat for 10-20 min, adding a magnesium ingot, starting a stirring paddle to stir and melt the magnesium ingot, continuing stirring for 20-30 min after the magnesium ingot is completely molten, preserving heat and standing for 10-20 min to obtain a molten liquid.
Further, the mass ratio of the zinc ingot to the aluminum ingot to the magnesium ingot is 91:6: 3.
Further, the zinc content of the zinc ingot is 99.99%, the aluminum content of the aluminum ingot is 99.8%, and the magnesium content of the magnesium ingot is 99.8%. The quality of the zinc-aluminum-magnesium alloy can be improved by adopting high-purity zinc ingots, aluminum ingots and magnesium ingots.
Further, the stirring paddle is a graphite stirring paddle. The graphite stirring paddle can accelerate the melting time of the magnesium ingot.
Furthermore, the demolding is lifted by a crane. And a crane is adopted for hoisting, so that the safety performance is improved.
Further, the operation of removing flash and burrs of the demoulded alloy is also included. The alloy after being demoulded can be subjected to flash and burr removal, and the appearance of the alloy can be improved.
Compared with the prior art, the gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy has the following beneficial effects:
compared with the conventional cooling means in the prior art, the method can promote the ternary alloy phase in the zinc-aluminum-magnesium ternary alloy to be fully nucleated and formed, reduce the formation of a binary phase structure as much as possible, particularly promote the Al-Zn-MgZn ternary alloy phase structure in the zinc-aluminum-magnesium alloy to be increased by about 10 percent, and the increase of the Al-Zn-MgZn ternary alloy structure has important influence on the formability, the cohesiveness, the corrosion resistance and the oxidation resistance of the zinc-aluminum-magnesium alloy, thereby having great significance for improving the quality of a hot-dip galvanized product. In addition, the cooling forming time in the alloy preparation process is reduced by about half compared with the prior art, the cooling forming time in the prior art needs 3-4 hours, the cooling forming time only needs 1.5-2 hours, the time cost of zinc-aluminum-magnesium production is greatly reduced, and the fuel gas energy consumption is reduced by about 10%, so that the energy conservation is facilitated.
Drawings
FIG. 1 is a metallographic structure analysis chart of a zinc-aluminum-magnesium alloy of comparative example 1;
fig. 2 is a metallographic structure analysis chart of a zinc-aluminum-magnesium alloy of example 3.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
A gradient cooling method for improving the quality of a zinc-aluminum-magnesium alloy comprises the following specific steps:
step (1), smelting stage: preparing 60t of zinc-aluminum-magnesium alloy, preparing 54.6t of 91% pure zinc (99.99% Zn), 3.6t of 6% pure aluminum (99.8% Al) and 1.8t of 3% pure magnesium (99.8% Mg), smelting zinc in a zinc ingot at 480 ℃, fishing out dross after the zinc ingot is completely molten into a liquid phase, adding an aluminum ingot, raising the temperature to 620 ℃ to melt aluminum, fishing out dross on the surface of the aluminum ingot after the aluminum ingot is molten, reducing the temperature to about 540 ℃, adding a magnesium ingot after the temperature is kept for 10min, starting a graphite stirring paddle to stir and melt the magnesium ingot, continuing stirring for 30min after the magnesium ingot is completely molten, and keeping the temperature for 10min to obtain a molten liquid;
and (2) ingot casting: casting the molten metal obtained in the step (1) into an ingot casting mold, controlling the casting temperature to be 570 ℃, after the casting is finished, formulating a gradient cooling method according to a phase structure nucleation temperature interval of the Zn-6Al-3Mg ternary alloy, specifically, when the alloy casting temperature is 500 ℃, and simultaneously, when a casting body with the temperature of more than 420 ℃ still exists in the ingot casting mold after the casting is finished, reducing the temperature of the casting body in the mold to 370 ℃ within 10min by adopting a high-power fan and other rapid cooling means, and then immediately stopping rapid cooling; stopping rapid cooling, entering a heating slow cooling stage, adopting a U-shaped double-pipe small gas nozzle for combustion and heat preservation, covering a closed heat preservation cover plate, and rapidly cooling to demoulding by using a high-power fan after the temperature is reduced to 280 ℃, wherein the time from the rapid cooling means to demoulding is 1.8 hours; the nucleation temperature range of the phase structure of the Zn-6Al-3Mg ternary alloy is 270-360 ℃.
And (3): and (4) lifting the demould by using a crane, and removing burrs and burrs of the demoulded alloy.
Example 2
A gradient cooling method for improving the quality of a zinc-aluminum-magnesium alloy comprises the following specific steps:
step (1), smelting stage: preparing 40t of zinc-aluminum-magnesium alloy, preparing 36.4t of 91% pure zinc (99.99% Zn), 2.4t of 6% pure aluminum (99.8% Al) and 1.2t of 3% pure magnesium (99.8% Mg), smelting zinc in a zinc ingot at 520 ℃, fishing out dross after the zinc ingot is completely molten into a liquid phase, adding an aluminum ingot, raising the temperature to 580 ℃ to melt aluminum, fishing out surface dross after the aluminum ingot is molten, reducing the temperature to about 500 ℃, adding a magnesium ingot after preserving heat for 20min, starting a graphite stirring paddle to stir and melt the magnesium ingot, continuing stirring for 20min after the magnesium ingot is completely molten, and preserving heat for 20min to obtain a molten liquid;
and (2) ingot casting: casting the molten metal obtained in the step (1) into an ingot casting mold, controlling the casting temperature to be 530 ℃, keeping the slag dragging action in the casting process, and making a gradient cooling method according to the phase structure nucleation temperature interval of the Zn-6Al-3Mg ternary alloy after casting is finished, wherein when the alloy casting temperature is 550 ℃, and simultaneously when a casting body with the temperature of more than 420 ℃ still exists in the ingot casting mold after casting is finished, the temperature of the casting body is reduced to 350 ℃ in the mold by adopting a high-power fan and other rapid cooling means within 5min, and then immediately stopping rapid cooling; stopping rapid cooling, entering a heating slow cooling stage, adopting a U-shaped double-pipe small gas nozzle for combustion and heat preservation, covering a closed heat preservation cover plate, and rapidly cooling to demoulding by using a high-power fan after the temperature is reduced to 270 ℃, wherein the time from the rapid cooling means to demoulding is 2 hours; the nucleation temperature range of the phase structure of the Zn-6Al-3Mg ternary alloy is 270-360 ℃.
And (3): and (4) lifting the demould by using a crane, and removing burrs and burrs of the demoulded alloy.
Example 3
A gradient cooling method for improving the quality of a zinc-aluminum-magnesium alloy comprises the following specific steps:
step (1), smelting stage: preparing 20t of zinc-aluminum-magnesium alloy, preparing 18.2t of 91% pure zinc (99.99% Zn), 1.2t of 6% pure aluminum (99.8% Al) and 0.6t of 3% pure magnesium (99.8% Mg), smelting zinc in a zinc ingot at 500 ℃, fishing out dross after the zinc ingot is completely molten into a liquid phase, adding an aluminum ingot, raising the temperature to 600 ℃ to melt aluminum, fishing out dross on the surface of the aluminum ingot after the aluminum ingot is molten, reducing the temperature to about 520 ℃, adding a magnesium ingot after heat preservation is carried out for 15min, starting a graphite stirring paddle to stir and melt the magnesium ingot, continuing stirring for 25min after the magnesium ingot is completely molten, and then preserving the heat for 15min to obtain a molten liquid;
and (2) ingot casting: casting the molten metal obtained in the step (1) into an ingot casting mold, controlling the casting temperature to be 550 ℃, keeping the slag dragging action in the casting process, and making a gradient cooling method according to the phase structure nucleation temperature interval of the Zn-6Al-3Mg ternary alloy after casting is finished, wherein when the alloy casting temperature is 540 ℃, and simultaneously when a casting body with the temperature of more than 420 ℃ still exists in the ingot casting mold after casting is finished, the casting body is reduced to 360 ℃ in the mold by adopting rapid cooling means such as a high-power fan and the like within 7min, and then immediately stopping rapid cooling; stopping rapid cooling, entering a heating slow cooling stage, adopting a U-shaped double-pipe small gas nozzle for combustion and heat preservation, covering a closed heat preservation cover plate, rapidly cooling to demoulding by using a high-power fan after the temperature is reduced to 270 ℃, wherein the time from the rapid cooling means to demoulding is 1.5 hours; the nucleation temperature range of the phase structure of the Zn-6Al-3Mg ternary alloy is 270-360 ℃.
And (3): and (4) lifting the demould by using a crane, and removing burrs and burrs of the demoulded alloy.
Comparative example 1
In the step (2) in the comparative example 1, after the liquid zinc-aluminum-magnesium alloy is poured into a mold, a gas heating means is adopted to slowly and uniformly promote the solidification and forming of the zinc-aluminum-magnesium alloy after 3 hours, and then the mold is removed, and the rest is the same as the example 3.
The ternary phase diagrams of the zinc-aluminum-magnesium alloys prepared in example 3 and comparative example 1 were analyzed and the results were as follows:
FIG. 1 is a metallographic analysis chart of a zinc-aluminum-magnesium alloy according to comparative example 1, in which the proportion of a ternary alloy structure is 71.8%.
FIG. 2 is a metallographic structure analysis chart of a zinc-aluminum-magnesium alloy according to example 3, in which the proportion of a ternary alloy structure is 80.3%.
The obvious difference is seen from figure 2, the growth of the binary alloy structure is effectively inhibited, and the nucleation growth of the ternary alloy structure is more sufficient. The gradient cooling method of the invention can improve the quality of the zinc-aluminum-magnesium alloy.
The features of the embodiments and embodiments described above may be combined with each other without conflict.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A gradient cooling method for improving the quality of a zinc-aluminum-magnesium alloy is characterized in that a molten melt is cast into an ingot casting mold, the casting temperature is controlled to be 530-570 ℃, after casting is finished, a gradient cooling method is formulated according to a phase structure nucleation temperature interval of a Zn-6Al-3Mg ternary alloy, the gradient cooling method comprises a first cooling stage and a second cooling stage, the first cooling stage is that when the casting temperature of the alloy is 500-550 ℃, and a casting body with the temperature of more than 420 ℃ still exists in the ingot casting mold after casting is finished, the casting body is cooled to 350-370 ℃ in the mold within 5-10 min by adopting a rapid cooling means, and then rapid cooling is stopped immediately; and the second cooling stage is a heating slow cooling stage after the rapid cooling is stopped, a U-shaped double-pipe small gas nozzle is adopted for combustion and heat preservation, a closed heat preservation cover plate is covered, and after the temperature is reduced to 270-280 ℃, the high-power fan is used for rapidly cooling to the demolding.
2. The gradient cooling method for improving the quality of a zinc-aluminum-magnesium alloy according to claim 1, wherein the time from the start of the rapid cooling means to the time of mold release is 1.5 to 2 hours.
3. The gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy according to claim 1, wherein the rapid cooling means is a high-power fan.
4. The gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy according to claim 1, wherein the slag dragging action is kept during the casting process of the zinc-aluminum-magnesium alloy into an ingot mold.
5. The gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy according to claim 1, wherein the nucleation temperature interval of the phase structure of the Zn-6Al-3Mg ternary alloy is 270-360 ℃.
6. The gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy according to any one of claims 1 to 5, wherein the molten metal is prepared by the following method: smelting zinc in a zinc ingot at 480-520 ℃, fishing out floating slag after the zinc ingot is completely molten into a liquid phase, adding an aluminum ingot, raising the temperature to 580-620 ℃ to melt aluminum, fishing out floating slag on the surface of the aluminum ingot after the aluminum ingot is molten, reducing the temperature to about 500-540 ℃, preserving heat for 10-20 min, adding a magnesium ingot, starting a stirring paddle to stir and melt the magnesium ingot, continuing stirring for 20-30 min after the magnesium ingot is completely molten, preserving heat and standing for 10-20 min to obtain a molten liquid.
7. The gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy according to claim 6, wherein the mass ratio of the zinc ingot to the aluminum ingot to the magnesium ingot is 91:6: 3.
8. The gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy according to claim 7, wherein the zinc content of the zinc ingot is 99.99%, the aluminum content of the aluminum ingot is 99.8%, and the magnesium content of the magnesium ingot is 99.8%.
9. The gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy according to claim 6, wherein the stirring paddle is a graphite stirring paddle.
10. The gradient cooling method for improving the quality of the zinc-aluminum-magnesium alloy according to claim 6, wherein the demolding is lifted by a crane, and the method further comprises the step of removing burrs and fins from the demolded alloy.
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