CN113802037A - Preparation method of ultrahigh-strength aluminum alloy with high creep resistance - Google Patents
Preparation method of ultrahigh-strength aluminum alloy with high creep resistance Download PDFInfo
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Abstract
The invention discloses a preparation method of an ultra-high-strength aluminum alloy with high creep resistance, which comprises the following steps: obtaining a pre-prepared alloy ingot; the alloy ingot comprises the following components in percentage by mass: 10.0-13.0 wt% of Zns, 1.9-3.2 wt% of Mgs, 1.2-2.2 wt% of Cus, 0.02-0.2 wt% of Tis, 0.1-0.2 wt% of Zrs, 0.1-0.3 wt% of Sc, less than or equal to 0.05 wt% of Fe, less than or equal to 0.05 wt% of Si, Fe is more than Si, and Al is a balance element; carrying out induction melting on the alloy ingot under the condition of inert gas, uniformly mixing the melted alloy liquid, and then atomizing, spraying and depositing to obtain a billet; extruding the billet into a bar in an isothermal extrusion mode; and carrying out two-stage solution heat treatment on the bar, and carrying out quenching treatment on the heat-treated bar to obtain the finished product of the aluminum alloy. After hot extrusion, the alloy achieves complete densification, and compared with the traditional ultrahigh-strength aluminum alloy, the room-temperature and high-temperature creep resistance of the alloy is greatly improved, so that the application prospect of the alloy is greatly expanded.
Description
Technical Field
The invention relates to the technical field of aluminum alloy preparation, in particular to a preparation method of an ultrahigh-strength aluminum alloy with high creep resistance.
Background
The Al-Zn-Mg-Cu (7XXX series) alloy has a wide application in the fields of aerospace, weaponry and the like due to the advantages of high strength, low density and the like. As a structural material, the service life of the material is required to be more than ten years under certain specific working conditions, and the working environment belongs to a generalized creep environment. At present, the Al-Zn-Mg-Cu series aluminum alloys with various component grades developed all over the world are nearly hundreds, the corresponding alloy heat treatment standards are classified, but the creep life of the ultra-high strength aluminum alloy is still lack of systematic research and evaluation.
Disclosure of Invention
The invention aims to provide a preparation method of an ultra-high-strength aluminum alloy with high creep resistance, and the preparation method is used for solving the problem that the creep resistance of the high-strength aluminum alloy is poor in the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a preparation method of an ultrahigh-strength aluminum alloy with high creep resistance comprises the following steps:
obtaining a pre-prepared alloy ingot; the alloy ingot comprises the following components in percentage by mass: 10.0-13.0 wt% of Zns, 1.9-3.2 wt% of Mgs, 1.2-2.2 wt% of Cus, 0.02-0.2 wt% of Tis, 0.1-0.2 wt% of Zrs, 0.1-0.3 wt% of Sc, less than or equal to 0.05 wt% of Fe, less than or equal to 0.05 wt% of Si, Fe is more than Si, and Al is a balance element;
carrying out induction melting on the alloy ingot under the condition of inert gas, uniformly mixing the melted alloy liquid, and then atomizing, spraying and depositing to obtain a billet;
extruding the billet into a bar in an isothermal extrusion mode;
and carrying out two-stage solution heat treatment on the bar, and carrying out quenching treatment on the heat-treated bar to obtain the finished product of the aluminum alloy.
Further, the preparation method of the alloy ingot specifically comprises the following steps:
when the temperature of a graphite clamp pot in the resistance furnace reaches 200 +/-5 ℃, adding raw materials;
controlling the smelting temperature to be 760 +/-5 ℃, and completely melting the raw materials at the smelting temperature:
keeping the temperature of the melted raw material solution for a certain time, and cooling to 740 +/-5 ℃ to perform melt processing;
and cooling the solution after the melt treatment to 720 +/-5 ℃, casting the solution into a metal cavity, and solidifying and cutting the solution into alloy ingots.
Further, the step of uniformly mixing the melted alloy liquid and then carrying out atomization, spray and deposition to obtain a billet comprises the following steps:
heating the molten alloy liquid to 750 +/-5 ℃ and preserving heat for 8-12 min;
fully and uniformly mixing the alloy liquid under the action of electromagnetic stirring;
and turning over the graphite crucible, casting the alloy liquid into a heat-preservation crucible at the temperature of 720-750 ℃, and starting atomization and spray deposition.
Further, the parameters of the atomized spray deposition are as follows: atomization pressure: pUpper layer of＝1.0MPa，PLower layer1.8 MPa; jet distance: 380 mm; eccentricity: 85 mm; jet inclination angle: 45 degrees; the swinging angle is as follows: 4 degrees.
Further, the extrusion temperature of the isothermal extrusion is 410-435 ℃, and the extrusion ratio is 5: 1.
Further, the temperature of the first-stage solution heat treatment in the two-stage solution heat treatment process is 450-460 ℃, and the heat preservation time is 0.8-1.2 h;
the temperature of the second stage solution heat treatment is 470-490 ℃, and the heat preservation time is 0.8-1.2 h.
Furthermore, the quenching transfer time is less than or equal to 15 seconds, and the quenching water temperature is 25-35 ℃.
Further, aging heat treatment is adopted after quenching treatment, wherein the treatment temperature is 120-130 ℃, and the treatment time is 16-20 hours.
According to the technical scheme, the embodiment of the invention at least has the following effects:
1. after hot extrusion, the alloy achieves complete densification, and compared with the traditional ultrahigh-strength aluminum alloy, the room-temperature and high-temperature creep resistance of the alloy is greatly improved, so that the application prospect of the alloy is greatly expanded;
2. improving the microstructure of the alloy by Sc element to obtain uniform and fine equiaxial crystal structure without segregation and coarse grain boundary phase;
3. the alloy is prepared by adopting a rapid solidification method, the limitation of the traditional alloy components is broken through, and the total alloying content reaches 15 wt.%.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Aiming at the problems mentioned in the background technology, the ultrahigh-strength aluminum alloy material with the rapid solidification characteristic is prepared by adopting a spray deposition method, a certain content of micro-alloying element Sc is added on the basis of the original alloy components, and the relationship between the alloy components and the microstructure and the creep resistance is established, so that the high-performance creep-resistant ultrahigh-strength aluminum alloy material is developed, and the method has important significance for the development of the industry in China.
The preparation method of the high-strength aluminum alloy comprises the following steps:
in the step (1), a master alloy is prepared by melting raw materials which comprise, by weight, 10.0-13.0 wt% of Zn, 1.9-3.2 wt% of Mg, 1.2-2.2 wt% of Cu, 0.02-0.2 wt% of Ti, 0.10-0.20 wt% of Zr, 0.1-0.2 wt% of Sc, less than or equal to 0.05 wt% of impurity element Si, less than or equal to 0.05 wt% of Fe, Fe greater than Si, and the balance Al. Alloy smelting is carried out in a resistance furnace by adopting a graphite crucible, when the temperature of the graphite crucible reaches 200 +/-5 ℃, preheated raw materials are added, the smelting temperature is controlled at 760 +/-5 ℃, heat preservation is carried out for 18-22 minutes after the alloy is completely melted down, the temperature is reduced to 740 +/-5 ℃, melt processing is carried out, stirring, refining degassing and slagging-off are carried out, standing is carried out for 8-12 minutes, the temperature is reduced to 720 +/-5 ℃, the alloy is cast into a metal mold, and the metal mold is cut into pieces after solidification
The small ingot of (2) is used as a master alloy material for spray forming.
And (2) melting and atomizing the alloy ingot under the protection of inert gas. After charging, the injection molding equipment is vacuumized, inert gas of 0.5atm is charged, induction melting is carried out in the environment of inert atmosphere, the gas in the alloy can be reduced, the formation of oxides can be prevented, the melting speed can be accelerated by adopting the induction melting, and the burning loss of Zn and Mg alloy elements can be reduced; and (3) when the alloy is completely melted and heated to 750 +/-5 ℃, preserving heat for 8-12min to ensure that the melt is fully and uniformly mixed under the action of electromagnetic stirring, then turning over the smelting crucible, casting the alloy liquid into a heat preservation crucible preheated to 720-750 ℃ in advance, and starting atomization and spray deposition.
The technological parameters of the atomization and spray deposition process for preparing the billet deposition are as follows: melting temperature: 750 +/-5 ℃; preheating temperature of the heat preservation crucible: 750 +/-5 ℃; catheter diameter: 3.2 mm; atomization pressure: pUpper layer of＝1.0MPa， PLower layer1.8 MPa; jet distance: 380 mm; eccentricity: 85 mm; jet inclination angle: 45 degrees; the swinging angle is as follows: 4 degrees; rotating speed of the precipitator: 120 rpm; the comprehensive moving speed of the depositor: 0.5 mm/s. 42kg of master alloy was sprayed, and the resulting ingot size was 200mm × 260mm, weight: 28 kg.
Step (3), pressing, densifying and preforming: the billet obtained by spray forming has a rough surface and is not very regular in shape, and peeling and machining are required to be carried out. The principle of peeling and regulating is that the surface has no obvious defect, and the cracking caused by stress concentration is prevented; an isothermal extrusion method is adopted, the extrusion temperature is 410-435 ℃, the extrusion ratio is 5:1, the moving speed of a punch is 0.5-1.5 mm/s, and the forming speed is 3-9 mm/s. The extruded rod has a diameter of 80 mm.
Step (4), heat treatment system: the double-stage solid solution system adopted by the invention is (450-460 ℃) x (0.8-1.5) h + (470-490 ℃) x (0.8-1.2) h + quenching; the quenching transfer time is less than or equal to 15 seconds, and the quenching water temperature is 25-35 ℃; the adopted aging system is single-stage aging: (120 ℃ -130 ℃) for 16-20 hours.
Example 1
And Al-11Zn-2.45Mg-1.7Cu-0.17Zr-0.2Sc alloy is sprayed and deposited.
The mother alloy is prepared by melting raw materials which comprise, by weight, 11 wt% of Zn, 2.45 wt% of Mg, 1.7 wt% of Cu, 0.1 wt% of Ti, 0.17 wt% of Zr, 0.2 wt% of Sc, 0.025 wt% of impurity element Si, 0.045 wt% of Fe and the balance of Al.
Alloy smelting is carried out in a resistance furnace by adopting a graphite crucible, when the temperature of the graphite crucible reaches 200 ℃, preheated raw materials are added, the smelting temperature is controlled at 760 ℃, the alloy is completely melted down and is kept warm for 20 minutes, the temperature is reduced to 740 ℃ for melt processing, stirring, refining, degassing and slagging off are carried out, then the mixture is kept stand for 10 minutes, the temperature is reduced to 720 ℃, the mixture is cast into a metal mold, and the metal mold is cut into pieces after solidification
The small ingot of (2) is used as a master alloy material for spray forming.
And under the protection of inert gas, melting and atomizing the alloy ingot for deposition. After charging, the injection molding equipment is vacuumized, inert gas of 0.5atm is charged, induction melting is carried out in the environment of inert atmosphere, the gas in the alloy can be reduced, the formation of oxides can be prevented, the melting speed can be accelerated by adopting the induction melting, and the burning loss of Zn and Mg alloy elements can be reduced; and (3) when the alloy is completely melted and heated to 750 ℃, preserving heat for 10min to ensure that the melt is fully and uniformly mixed under the action of electromagnetic stirring, then turning over the smelting crucible, casting the alloy liquid into the heat preservation crucible preheated to 720-750 ℃ in advance, and starting atomization and spray deposition.
The technological parameters of the atomization and spray deposition process for preparing the billet deposition are as follows: melting temperature: 750 ℃; preheating temperature of the heat preservation crucible: 750 ℃; catheter diameter: 3.2 mm; atomization pressure: pUpper layer of＝1.0MPa，PLower layer1.8 MPa; jet distance: 380 mm; eccentricity: 85 mm; jet inclination angle: 45 degrees; the swinging angle is as follows: 4 degrees; rotating speed of the precipitator: 120 rpm; the comprehensive moving speed of the depositor: 0.5 mm/s. Spraying master alloy 42kg to obtain a billet with a size phi of 200mm × 260mm, weight: 28 kg.
And (3) pressing, densifying and preforming: the billet obtained by spray forming has a rough surface and is not very regular in shape, and peeling and machining are required to be carried out. The principle of peeling and regulating is that the surface has no obvious defect, and the cracking caused by stress concentration is prevented; an isothermal extrusion method is adopted, the extrusion temperature is 410-435 ℃, the extrusion ratio is 5:1, the moving speed of a punch is 0.5-1.5 mm/s, and the forming speed is 3-9 mm/s. The extruded rod has a diameter of 80 mm.
And (3) a heat treatment system: the adopted two-stage solid solution system is 470 ℃ multiplied by 1.5h +490 ℃ multiplied by 1h + quenching; the quenching transfer time is less than or equal to 15 seconds, and the quenching water temperature is 25-35 ℃; the adopted aging system is single-stage aging: 120 ℃ for 16 h.
Testing creep property: creep experiments were performed on a GWT2504 model high temperature creep rupture tester. The creep stress is 450MPa, the creep temperature is respectively selected from 80 ℃ and 120 ℃, the temperature difference is +/-3 ℃, and the temperature rise speed is 3 ℃/min. The initial stress is less than 10% of the main set stress.
The creep results are shown in table 1:
TABLE 1
As can be seen from table 1, the creep resistance of the high-strength aluminum alloy obtained by adding 0.2% of Sc element provided in this example is improved at both normal temperature and high temperature.
Example 2
Spray-depositing Al-11Zn-2.45Mg-1.7Cu-0.17Zr-0.3Sc alloy.
The mother alloy is prepared by melting raw materials which comprise 11 wt% of Zn, 2.45 wt% of Mg, 1.7 wt% of Cu, 0.1 wt% of Ti, 0.17 wt% of Zr, 0.3 wt% of Sc, 0.025 wt% of impurity element Si, 0.045 wt% of Fe and the balance of Al.
Alloy smelting is carried out in a resistance furnace by adopting a graphite crucible, and after the temperature of the graphite crucible reaches 200 ℃, preheated raw materials are added for smeltingControlling the smelting temperature at 760 ℃, keeping the temperature for 20 minutes after the alloy is completely melted down, cooling to 740 ℃ for melt processing, stirring, refining, degassing, slagging off, standing for 10 minutes, cooling to 720 ℃, casting into a metal mold, solidifying and cutting into pieces
The small ingot of (2) is used as a master alloy material for spray forming.
And under the protection of inert gas, melting and atomizing the alloy ingot for deposition. After charging, the injection molding equipment is vacuumized, inert gas of 0.5atm is charged, induction melting is carried out in the environment of inert atmosphere, the gas in the alloy can be reduced, the formation of oxides can be prevented, the melting speed can be accelerated by adopting the induction melting, and the burning loss of Zn and Mg alloy elements can be reduced; and (3) when the alloy is completely melted and heated to 750 ℃, preserving heat for 10min to ensure that the melt is fully and uniformly mixed under the action of electromagnetic stirring, then turning over the smelting crucible, casting the alloy liquid into the heat preservation crucible preheated to 720-750 ℃ in advance, and starting atomization and spray deposition.
The technological parameters of the atomization and spray deposition process for preparing the billet deposition are as follows: melting temperature: 750 ℃; preheating temperature of the heat preservation crucible: 750 ℃; catheter diameter: 3.2 mm; atomization pressure: pUpper layer of＝1.0MPa，PLower layer1.8 MPa; jet distance: 380 mm; eccentricity: 85 mm; jet inclination angle: 45 degrees; the swinging angle is as follows: 4 degrees; rotating speed of the precipitator: 120 rpm; the comprehensive moving speed of the depositor: 0.5 mm/s. 42kg of master alloy was sprayed, and the resulting ingot size was 200mm × 260mm, weight: 28 kg.
And (3) pressing, densifying and preforming: the billet obtained by spray forming has a rough surface and is not very regular in shape, and peeling and machining are required to be carried out. The principle of peeling and regulating is that the surface has no obvious defect, and the cracking caused by stress concentration is prevented; an isothermal extrusion method is adopted, the extrusion temperature is 410-435 ℃, the extrusion ratio is 5:1, the moving speed of a punch is 0.5-1.5 mm/s, and the forming speed is 3-9 mm/s. The extruded rod has a diameter of 80 mm.
And (3) a heat treatment system: the adopted two-stage solid solution system is 470 ℃ multiplied by 1.5h +490 ℃ multiplied by 1h + quenching; the quenching transfer time is less than or equal to 15 seconds, and the quenching water temperature is 25-35 ℃; the adopted aging system is single-stage aging: 120 ℃ for 16 h.
Testing creep property: creep experiments were performed on a GWT2504 model high temperature creep rupture tester. The creep stress is 450MPa, the creep temperature is respectively selected from 80 ℃ and 120 ℃, the temperature difference is +/-3 ℃, and the temperature rise speed is 3 ℃/min. The initial stress is less than 10% of the main set stress.
The creep results are shown in table 2:
TABLE 2
As can be seen from table 2, the creep resistance of the high-strength aluminum alloy obtained by adding 0.3% Sc element provided in this example is improved at both normal temperature and high temperature. In the present example and example, the ratio of Sc element is changed from 0.2% to 0.3% compared with 1. The alloy provided in this example is slightly less creep resistant than example 1.
Example 3
Spray-depositing Al-11Zn-2.45Mg-1.7Cu-0.17Zr-0.15Sc alloy.
The mother alloy is prepared by melting raw materials which comprise, by weight, 11 wt% of Zn, 2.45 wt% of Mg, 1.7 wt% of Cu, 0.1 wt% of Ti, 0.17 wt% of Zr, 0.2 wt% of Sc, 0.025 wt% of impurity element Si, 0.045 wt% of Fe and the balance of Al.
Alloy smelting is carried out in a resistance furnace by adopting a graphite crucible, when the temperature of the graphite crucible reaches 200 ℃, preheated raw materials are added, the smelting temperature is controlled at 760 ℃, the alloy is completely melted down and is kept warm for 20 minutes, the temperature is reduced to 740 ℃ for melt processing, stirring, refining, degassing and slagging off are carried out, then the mixture is kept stand for 10 minutes, the temperature is reduced to 720 ℃, the mixture is cast into a metal mold, and the metal mold is cut into pieces after solidification
The small ingot of (2) is used as a master alloy material for spray forming.
And under the protection of inert gas, melting and atomizing the alloy ingot for deposition. After charging, the injection molding equipment is vacuumized, inert gas of 0.5atm is charged, induction melting is carried out in the environment of inert atmosphere, the gas in the alloy can be reduced, the formation of oxides can be prevented, the melting speed can be accelerated by adopting the induction melting, and the burning loss of Zn and Mg alloy elements can be reduced; and (3) when the alloy is completely melted and heated to 750 ℃, preserving heat for 10min to ensure that the melt is fully and uniformly mixed under the action of electromagnetic stirring, then turning over the smelting crucible, casting the alloy liquid into the heat preservation crucible preheated to 720-750 ℃ in advance, and starting atomization and spray deposition.
The technological parameters of the atomization and spray deposition process for preparing the billet deposition are as follows: melting temperature: 750 ℃; preheating temperature of the heat preservation crucible: 750 ℃; catheter diameter: 3.2 mm; atomization pressure: pUpper layer of＝1.0MPa，PLower layer1.8 MPa; jet distance: 380 mm; eccentricity: 85 mm; jet inclination angle: 45 degrees; the swinging angle is as follows: 4 degrees; rotating speed of the precipitator: 120 rpm; the comprehensive moving speed of the depositor: 0.5 mm/s. 42kg of master alloy was sprayed, and the resulting ingot size was 200mm × 260mm, weight: 28 kg.
And (3) pressing, densifying and preforming: the billet obtained by spray forming has a rough surface and is not very regular in shape, and peeling and machining are required to be carried out. The principle of peeling and regulating is that the surface has no obvious defect, and the cracking caused by stress concentration is prevented; an isothermal extrusion method is adopted, the extrusion temperature is 410-435 ℃, the extrusion ratio is 5:1, the moving speed of a punch is 0.5-1.5 mm/s, and the forming speed is 3-9 mm/s. The extruded rod has a diameter of 80 mm.
And (3) a heat treatment system: the adopted two-stage solid solution system is 470 ℃ multiplied by 1.5h +490 ℃ multiplied by 1h + quenching; the quenching transfer time is less than or equal to 15 seconds, and the quenching water temperature is 25-35 ℃; the adopted aging system is single-stage aging: 120 ℃ for 16 h.
Testing creep property: creep experiments were performed on a GWT2504 model high temperature creep rupture tester. The creep stress is 450MPa, the creep temperature is respectively selected from 80 ℃ and 120 ℃, the temperature difference is +/-3 ℃, and the temperature rise speed is 3 ℃/min. The initial stress is less than 10% of the main set stress.
The creep results are shown in table 3:
TABLE 3
As can be seen from table 3, the creep resistance of the high-strength aluminum alloy obtained by adding 0.15% of Sc element provided in this example is improved at both normal temperature and high temperature. In this example, the Sc element was changed from 0.2% to 0.15% as compared with example 1. The alloy provided in this example has slightly poorer creep resistance than that of example 1.
According to the three embodiments, the high-strength aluminum alloy provided by the application has the best creep resistance when the Sc element is 0.2%.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (8)
1. A preparation method of an ultrahigh-strength aluminum alloy with high creep resistance is characterized by comprising the following steps:
obtaining a pre-prepared alloy ingot; the alloy ingot comprises the following components in percentage by mass:
10.0-13.0 wt% of Zns, 1.9-3.2 wt% of Mgs, 1.2-2.2 wt% of Cus, 0.02-0.2 wt% of Tis, 0.1-0.2 wt% of Zrs, 0.1-0.3 wt% of Sc, less than or equal to 0.05 wt% of Fe, less than or equal to 0.05 wt% of Si, Fe is more than Si, and Al is a balance element;
carrying out induction melting on the alloy ingot under the condition of inert gas, uniformly mixing the melted alloy liquid, and then atomizing, spraying and depositing to obtain a billet;
extruding the billet into a bar in an isothermal extrusion mode;
and carrying out two-stage solution heat treatment on the bar, and carrying out quenching treatment on the heat-treated bar to obtain the finished product of the aluminum alloy.
2. The method for preparing the ultrahigh-strength aluminum alloy with high creep resistance according to claim 1, wherein the method for preparing the alloy ingot specifically comprises the following steps:
when the temperature of a graphite clamp pot in the resistance furnace reaches 200 +/-5 ℃, adding raw materials;
controlling the smelting temperature to be 760 +/-5 ℃, and completely melting the raw materials at the smelting temperature:
keeping the temperature of the melted raw material solution for a certain time, and cooling to 740 +/-5 ℃ to perform melt processing;
and cooling the solution after the melt treatment to 720 +/-5 ℃, casting the solution into a metal cavity, and solidifying and cutting the solution into alloy ingots.
3. The method for preparing the ultrahigh-strength aluminum alloy with high creep resistance according to claim 1, wherein the step of uniformly mixing the molten alloy liquid and then atomizing, spraying and depositing to obtain a billet comprises the following steps:
heating the molten alloy liquid to 750 +/-5 ℃ and preserving heat for 8-12 min;
fully and uniformly mixing the alloy liquid under the action of electromagnetic stirring;
and turning over the graphite crucible, casting the alloy liquid into a heat-preservation crucible at the temperature of 720-750 ℃, and starting atomization and spray deposition.
4. The method for preparing the ultra-high strength aluminum alloy with high creep resistance according to claim 3, wherein the parameters of the atomized spray deposition are as follows: atomization pressure: pUpper layer of＝1.0MPa，PLower layer1.8 MPa; jet distance: 380 mm; eccentricity: 85 mm; jet inclination angle: 45 degrees; the swinging angle is as follows: 4 degrees.
5. The method for preparing the ultrahigh-strength aluminum alloy with high creep resistance according to claim 1, wherein the extrusion temperature of the isothermal extrusion is 410-435 ℃, and the extrusion ratio is 5: 1.
6. The method for preparing the ultrahigh-strength aluminum alloy with high creep resistance according to claim 1, wherein the temperature of the first stage solution heat treatment in the double-stage solution heat treatment process is 450-460 ℃, and the holding time is 0.8-1.5 h;
the temperature of the second stage solution heat treatment is 470-490 ℃, and the heat preservation time is 0.8-1.2 h.
7. The preparation method of the ultrahigh-strength aluminum alloy with high creep resistance according to claim 1, wherein the quenching transfer time is less than or equal to 15 seconds, and the quenching water temperature is 25-35 ℃.
8. The preparation method of the ultrahigh-strength aluminum alloy with high creep resistance according to claim 1, characterized in that aging heat treatment is adopted after quenching treatment, wherein the treatment temperature is 120-130 ℃, and the treatment time is 16-20 h.
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| CN117904500A (en) * | 2023-11-15 | 2024-04-19 | 东北轻合金有限责任公司 | 800 MPa-grade ultrahigh-strength aluminum alloy round ingot and preparation method thereof |
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