CN114480933B - Ultra-high-strength aluminum alloy and preparation method and application thereof - Google Patents
Ultra-high-strength aluminum alloy and preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of aluminum alloy processing, and particularly relates to an extra-high-strength aluminum alloy and a preparation method and application thereof. The invention prepares the 800 MPa-grade extra-high strength aluminum alloy by adjusting alloy components and adopting multiple processing means such as micro-alloying, thermomechanical treatment and the like, wherein the extra-high strength aluminum alloy consists of the following components in percentage by mass: zinc: 8.0 to 11.0%, copper: 2.5 to 3.0%, magnesium: 1.2 to 2.5%, silver: 0.1 to 0.5%, zirconium: 0.05 to 0.3%, yttrium: 0.05 to 0.3 percent of aluminum and inevitable impurity elements in balance; wherein the mass ratio of zinc to magnesium is controlled to be 4.2 to 6.5, and the mass ratio of copper to magnesium is controlled to be 1.0 to 2.5. The ultra-high strength aluminum alloy has high strength and good comprehensive mechanical property, the tensile strength is up to 805MPa, the specified plastic elongation strength is 751MPa, the elongation after fracture is 12%, the light weight requirements in the fields of spacecrafts, large airplanes and the like are met, and the ultra-high strength aluminum alloy has a wide application prospect.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy processing, and particularly relates to an extra-high-strength aluminum alloy and a preparation method and application thereof.
Background
The Al-Zn-Mg-Cu series ultrahigh strength aluminum alloy has the characteristics of low density, high specific strength, good toughness, corrosion resistance and the like, and is widely applied to the fields of aerospace, weapon industry and the like. Wherein more than 90 percent of the aluminum alloy used for manufacturing the airplane is ultrahigh-strength aluminum alloy.
In recent years, with the increasing requirements of airplane design on the aspects of flight performance, service life, safety and reliability, structural weight control and the like, the demand for 800 MPa-grade ultrahigh-strength aluminum alloy materials with high alloying and high comprehensive mechanical performance is increasing.
Al-Zn-Mg-Cu series ultrahigh strength aluminum alloyThe strengthening phase is Mg 2 However, with the increase of the alloying degree, the Al-Zn-Mg-Cu ultrahigh strength aluminum alloy material in the prior art has the problems of poor ductility and toughness, unstable performance, insufficient comprehensive mechanical properties, and the like, for example, chinese patent with the publication number of CN 101698914B shares an ultrahigh strength aluminum alloy and a preparation method thereof, and adopts higher Zn content to prepare an 800MPa grade ultrahigh strength aluminum alloy, but Cr and V elements are also added to the alloy, which is unfavorable for the plasticity performance of the alloy. For another example, chinese patent No. CN 106399776B discloses an 800MPa grade ultra-high strength aluminum alloy and a preparation method thereof, wherein a higher Mg content is adopted, wherein the mass ratio of zinc to magnesium is controlled to 3-5, the difference of tensile strength indexes in the same process is above 100MPa, the alloy performance is unstable, and the comprehensive mechanical property is poor.
Therefore, aiming at the technical problems in the prior art, a novel ultra-high strength aluminum alloy is urgently needed to be developed so as to improve the comprehensive mechanical properties such as ductility, toughness and strength of the ultra-high strength aluminum alloy material.
Disclosure of Invention
Based on the defects and shortcomings of the existing ultrahigh-strength aluminum alloy, the invention prepares the 800 MPa-grade ultrahigh-strength aluminum alloy by adjusting alloy components and adopting multiple processing means such as micro-alloying, thermomechanical treatment and the like, realizes good matching of strength and plasticity while improving the strength of the alloy material, and has excellent comprehensive mechanical properties and wide application prospect.
The invention also provides a preparation method of the extra-high-strength aluminum alloy.
Based on the purpose, the invention adopts the following technical scheme:
the ultra-high strength aluminum alloy comprises the following components in percentage by mass: zinc (Zn): 8.0 to 11.0%, copper (Cu): 2.5 to 3.0%, magnesium (Mg): 1.2 to 2.5%, silver (Ag): 0.1 to 0.5%, zirconium (Zr): 0.05 to 0.3%, yttrium: 0.05 to 0.3 percent of aluminum (Al) and inevitable impurity elements for the rest; wherein, the mass ratio of zinc to magnesium is controlled to be (4.2-6.5): 1, controlling the mass ratio of copper to magnesium to be (1.0-2.5): 1.
the preparation method of the ultra-high-strength aluminum alloy comprises the following steps:
(1) Proportioning according to the mass percentage of each component in the alloy; smelting the prepared raw materials in argon atmosphere at 750-820 ℃ to obtain molten metal;
(2) Refining the metal liquid obtained in the step (1) for 10-30min at 730-760 ℃ in an argon atmosphere, standing for 10-30min at 710-730 ℃ to obtain a casting liquid, and casting and forming the casting liquid to obtain a cast ingot; carrying out homogenization annealing treatment on the obtained cast ingot in an argon atmosphere to obtain a homogenized cast ingot;
(3) Removing a surface oxide layer from the ingot casting subjected to homogenization treatment in the step (2), and then extruding and forming the ingot casting as a blank to obtain a bar material, wherein the extrusion temperature is 400-455 ℃, and the extrusion speed is 10-15 m/min during extrusion forming;
(4) And (4) carrying out solid solution treatment, pre-stretching and aging treatment on the bar obtained in the step (3) to obtain the steel.
Specifically, the smelting process in the step (1) comprises the following steps: the prepared raw materials are put into a vacuum induction smelting furnace, the vacuum induction smelting furnace is vacuumized until the vacuum degree in the furnace is 0.1-10 Pa, then argon is introduced until the pressure in the furnace reaches 100-250 Pa, the temperature is raised to 750-820 ℃, and the temperature is kept until molten metal is obtained.
Specifically, the homogenizing annealing treatment conditions in the step (2) are as follows: firstly, preserving the heat for 24 to 48 hours at the temperature of 420 to 500 ℃, and then cooling the mixture to the room temperature in the air.
More preferably, the homogenizing annealing treatment in the step (2) is a two-stage homogenizing annealing treatment, and the process conditions are as follows: firstly heating for 12-24 h at 420-450 ℃, then heating to 480-500 ℃ for further heating for 12-24 h, and finally cooling to room temperature in the air.
Specifically, the extrusion ratio of the extrusion molding process in the step (3) is 36-81.
Specifically, the deformation amount of the pre-stretching process in the step (4) is controlled to be 3-12%.
Specifically, the solution treatment process in the step (4) is as follows: keeping the temperature for 1 to 3 hours at the temperature of 455 to 490 ℃, and then quenching with water; the aging treatment process comprises the following steps: keeping the temperature for 12 to 24 hours at the temperature of between 110 and 150 ℃.
Preferably, in the solution treatment, the temperature of the cooling water for water quenching is 45 to 65 ℃, and the water quenching transfer time is 10 to 30s.
The invention further provides application of the ultra-high strength aluminum alloy material in preparation of aviation connection structural parts.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention uses high-purity metal and intermediate alloy as raw materials, adopts a vacuum melting mode, reduces the contents of impurity elements and gas slag by controlling the saturated vapor pressure in the furnace, obtains high-purity aluminum alloy melt, avoids forming casting defects in the alloy, and improves the metallurgical quality and the plastic toughness of the cast ingot of the ultra-high-strength aluminum alloy.
2. The alloy of the invention adopts higher Zn/Mg mass and Cu/Mg mass ratio to ensure that the alloy except the main strengthening phase eta (Mg) 2 Zn) phase, a large amount of theta (Al) is also introduced 2 Cu) phase, remarkably improving the mechanical property of the alloy. By adding a small amount of Ag element, not only the strengthening effect can be promoted, but also omega (Al) can be better formed 2 Cu) phase, further improving the alloy strength. By the combined addition of Zr and Y, al is formed 3 Zr、Al 3 Y、Al 3 And (Zr, Y) and other strengthening phases which can be used as heterogeneous nucleation refined crystal grain cores in the alloy solidification process, so that the comprehensive mechanical properties of the aluminum alloy are improved.
3. The invention adopts a deformation processing mode of two-stage homogenization and large extrusion ratio, can effectively eliminate casting defects, and the alloy after extrusion deformation has a completely recrystallized structure, so that the plasticity and toughness of the alloy are effectively improved. And a pre-stretching process with large deformation is adopted, so that the precipitation of a strengthening phase in the aging process is promoted, and the mechanical property of the alloy is further improved.
4. According to the invention, the thermomechanical treatment process is optimized, so that the alloy strengthening phase, the grain size and the like are effectively controlled, the aging strengthening effect of each component element is fully exerted, the good matching of the alloy strength and plasticity is realized, the 800 MPa-grade extra-high-strength aluminum alloy with excellent comprehensive mechanical property is finally obtained, and the properties of 782-805MPa tensile strength, 723-771MPa plastic elongation and 11.5-18.5% elongation after fracture can be realized.
Drawings
FIG. 1 is a metallographic picture of a product obtained in step (5) of example 2 of the present invention;
FIG. 2 is a stress-strain curve of tensile test of the finished product obtained in example 2 of the present invention.
Detailed Description
In order to make the technical purpose, technical scheme and beneficial effects of the invention clearer, the technical scheme of the invention is further described with reference to specific examples, which are intended to explain the invention and are not to be construed as limiting the invention, and the specific techniques or conditions are not indicated in the examples, which are performed according to the techniques or conditions described in the literature in the field or according to the product specification, and the raw materials used in the following examples are all common commercial products.
The prepared raw materials comprise aluminum metal, copper metal, magnesium metal and intermediate alloy, wherein 99.98% of industrial remelting refined aluminum ingots are adopted as the aluminum metal, 99.99% of cathode electrolytic copper is adopted as the copper metal, 99.99% of high-purity magnesium ingots are adopted as the magnesium metal, and Al-40Ag, al-4Zr and Al-10Y intermediate alloy ingots are respectively adopted as the intermediate alloy (Al-Ag, al-Zr and Al-Y).
Example 1
The ultra-high strength aluminum alloy comprises the following components in percentage by mass: zn:11%, cu:3.5%, mg:2.0%, ag:0.1%, zr:0.15%, Y:0.15%, the balance being Al and inevitable impurity elements; wherein the mass ratio of Zn to Mg is 5.5, and the mass ratio of Cu to Mg is 1.75.
The preparation method of the ultra-high-strength aluminum alloy comprises the following specific steps:
(1) Proportioning according to the mass percentage of each component in the alloy; preheating the prepared raw materials, adding the raw materials into a vacuum induction smelting furnace, vacuumizing until the vacuum degree reaches 1Pa, introducing high-purity argon until the pressure in the furnace reaches 200Pa, heating to 780 ℃ and smelting to obtain molten metal;
(2) Refining the molten metal obtained in the step (1) at 750 ℃ for 15min under an argon atmosphere, standing at 720 ℃ for 15min to obtain a casting liquid, and casting and forming the casting liquid to obtain a cast ingot;
(3) Performing two-stage homogenizing annealing on the ingot obtained in the step (2) in an argon atmosphere to obtain a homogenized ingot; wherein the homogenizing annealing conditions are as follows: firstly heating at 420 ℃ for 18h, then heating to 490 ℃ for further heating for 24h, and finally cooling to room temperature in the air;
(4) After removing a surface oxide layer from the ingot subjected to homogenization treatment in the step (3), preheating to 440 ℃, and carrying out extrusion forming at an extrusion ratio of 81 and an extrusion speed of 10m/min to obtain a bar material;
(5) Carrying out solution treatment on the bar obtained in the step (4): keeping the temperature for 1h at 475 ℃, and then performing water quenching, wherein the temperature of cooling water for water quenching is 45 ℃, and the transfer time is 15s; then pre-stretching: the deformation amount is 6%; and (3) final aging treatment: keeping the temperature at 120 ℃ for 24h to obtain the product.
Example 2
The ultra-high strength aluminum alloy comprises the following components in percentage by mass: zn:10%, cu:3.0%, mg:1.2%, ag:0.3%, zr:0.2%, Y:0.2% of Al and inevitable impurity elements as the rest; wherein the mass ratio of Zn to Mg was 8.33, and the mass ratio of Cu to Mg was 2.5.
The preparation method of the ultra-high-strength aluminum alloy comprises the following specific steps:
(1) Proportioning according to the mass percentage of each component in the alloy; preheating the prepared raw materials, adding the raw materials into a vacuum induction smelting furnace, vacuumizing until the vacuum degree reaches 0.5Pa, introducing high-purity argon until the pressure in the furnace reaches 100Pa, and heating to 800 ℃ for smelting to obtain molten metal;
(2) Refining the molten metal obtained in the step (1) at 750 ℃ for 20min in an argon atmosphere, standing at 720 ℃ for 20min to obtain a casting liquid, and casting and forming the casting liquid to obtain a cast ingot;
(3) Performing two-stage homogenizing annealing on the ingot obtained in the step (2) in an argon atmosphere to obtain a homogenized ingot; wherein the homogenizing annealing conditions are as follows: firstly heating at 430 ℃ for 12h, then heating to 485 ℃ and continuing heating for 24h, and finally cooling to room temperature in the air;
(4) After removing a surface oxide layer from the cast ingot subjected to homogenization treatment in the step (3), preheating to 430 ℃, and carrying out extrusion forming at an extrusion ratio of 71 and an extrusion speed of 12m/min to obtain a bar material;
(5) Carrying out solution treatment on the bar obtained in the step (4): keeping the temperature for 2h at 465 ℃, and then performing water quenching, wherein the temperature of cooling water for water quenching is 50 ℃, and the transfer time is 10s; then pre-stretching: the deformation amount is 3%; and (3) final aging treatment: preserving the heat at 135 ℃ for 20h to obtain the product.
The metallographic image of the ultra-high strength aluminum alloy obtained in the step (5) of the example 2 is shown in fig. 1, and it can be seen from fig. 1 that the microstructure of the plate is an incomplete recrystallization structure, the crystal grains are fine and uniform, and the size of the crystal grains is between 2 μm and 8 μm, so that the comprehensive mechanical properties of the finished bar are ensured.
Example 3
The ultra-high strength aluminum alloy comprises the following components in percentage by mass: zn:10%, cu:2.5%, mg:2.5%, ag:0.2%, zr:0.15%, Y:0.2% of Al and inevitable impurity elements as the rest; wherein the mass ratio of Zn to Mg is 4.0, and the mass ratio of Cu to Mg is 1.0.
The preparation method of the ultra-high-strength aluminum alloy comprises the following specific steps:
(1) Proportioning according to the mass percentage of each component in the alloy; preheating the prepared raw materials, adding the raw materials into a vacuum induction smelting furnace, vacuumizing until the vacuum degree reaches 3Pa, introducing high-purity argon until the pressure in the furnace reaches 250Pa, and heating to 820 ℃ for smelting to obtain molten metal;
(2) Refining the molten metal obtained in the step (1) at 750 ℃ for 30min in an argon atmosphere, standing at 720 ℃ for 30min to obtain a casting liquid, and casting and forming the casting liquid to obtain a cast ingot;
(3) Performing two-stage homogenizing annealing on the ingot obtained in the step (2) in an argon atmosphere to obtain a homogenized ingot; wherein the homogenizing annealing conditions are as follows: firstly heating at 430 ℃ for 12h, then heating to 485 ℃ for further heating for 24h, and finally cooling to room temperature in the air;
(4) After removing a surface oxide layer from the cast ingot subjected to homogenization treatment in the step (3), preheating to 430 ℃, and carrying out extrusion forming at an extrusion ratio of 64 and an extrusion speed of 12m/min to obtain a bar material;
(5) Carrying out solution treatment on the bar obtained in the step (4): keeping the temperature for 1.5h at the temperature of 485 ℃, and then performing water quenching, wherein the temperature of cooling water for water quenching is 60 ℃, and the transfer time is 10s; then pre-stretching: the deformation amount is 9%; and (3) final aging treatment: preserving the heat for 16h at 140 ℃ to obtain the product.
Example 4
The ultra-high strength aluminum alloy comprises the following components in percentage by mass: zn:9%, cu:2.5%, mg:1.5%, ag:0.1%, zr:0.2%, Y:0.2% of Al and inevitable impurity elements as the rest; wherein the mass ratio of Zn to Mg was 6.0, and the mass ratio of Cu to Mg was 1.67.
The preparation method of the ultra-high-strength aluminum alloy comprises the following specific steps:
(1) Proportioning according to the mass percentage of each component in the alloy; preheating the prepared raw materials, adding the raw materials into a vacuum induction smelting furnace, vacuumizing until the vacuum degree reaches 5Pa, introducing high-purity argon until the pressure in the furnace reaches 150Pa, and heating to 760 ℃ for smelting to obtain molten metal;
(2) Refining the molten metal obtained in the step (1) for 20min at 760 ℃ in an argon atmosphere, standing for 20min at 720 ℃ to obtain a casting liquid, and casting and forming the casting liquid to obtain a cast ingot;
(3) Performing two-stage homogenizing annealing on the ingot obtained in the step (2) in an argon atmosphere to obtain a homogenized ingot; wherein the homogenizing annealing conditions are as follows: firstly heating at 440 ℃ for 12h, then heating to 480 ℃ and continuing heating for 18h, and finally cooling to room temperature in the air;
(4) After removing a surface oxide layer from the cast ingot subjected to homogenization treatment in the step (3), preheating to 450 ℃, and carrying out extrusion forming at an extrusion ratio of 36 and an extrusion speed of 15m/min to obtain a bar material;
(5) Carrying out solution treatment on the bar obtained in the step (4): keeping the temperature at 455 ℃ for 3h, and then performing water quenching, wherein the temperature of cooling water for water quenching is 50 ℃, and the transfer time is 15s; then pre-stretching: the deformation amount is 6%; and (3) final aging treatment: keeping the temperature at 125 ℃ for 25h to obtain the product.
Example 5
The ultra-high-strength aluminum alloy consists of the following components in percentage by mass: zn:8%, cu:2.8%, mg:1.4%, ag:0.2%, zr:0.3%, Y:0.3 percent, and the balance of Al and inevitable impurity elements; wherein the mass ratio of Zn to Mg was 5.71, and the mass ratio of Cu to Mg was 2.0.
The preparation method of the ultra-high-strength aluminum alloy comprises the following specific steps:
(1) Proportioning according to the mass percentage of each component in the alloy; preheating the prepared raw materials, adding the raw materials into a vacuum induction smelting furnace, vacuumizing until the vacuum degree reaches 1Pa, introducing high-purity argon until the pressure in the furnace reaches 200Pa, heating to 800 ℃ and smelting to obtain molten metal;
(2) Refining the molten metal obtained in the step (1) at 750 ℃ for 20min in an argon atmosphere, standing at 720 ℃ for 20min to obtain a casting liquid, and casting and forming the casting liquid to obtain a cast ingot;
(3) Performing two-stage homogenizing annealing on the ingot obtained in the step (2) in an argon atmosphere to obtain a homogenized ingot; wherein the homogenizing annealing conditions are as follows: firstly heating for 24 hours at 420 ℃, then heating to 490 ℃ and continuing heating for 18 hours, and finally cooling to room temperature in the air;
(4) After removing a surface oxide layer from the cast ingot subjected to homogenization treatment in the step (3), preheating to 430 ℃, and performing extrusion forming at an extrusion ratio of 52 and an extrusion speed of 15m/min to obtain a bar material;
(5) Carrying out solution treatment on the bar obtained in the step (4): keeping the temperature for 2h at 475 ℃, and then carrying out water quenching, wherein the temperature of cooling water for water quenching is 65 ℃, and the transfer time is 15s; then pre-stretching: the deformation amount is 12%; and (3) final aging treatment: keeping the temperature at 110 ℃ for 24h to obtain the product.
Next, the mechanical properties of the test specimens (the ultrahigh-strength aluminum alloys obtained in examples 1 to 5) were measured using a SUN10 electronic universal tester, 3 sets of parallel specimens were taken for each state and averaged, and the results of the property measurements are shown in Table 1.
TABLE 1 ultra high strength aluminum alloy Performance test results
As can be seen from Table 1 and FIG. 2, the 800MPa grade extra-high strength aluminum alloy prepared by the invention has excellent comprehensive mechanical properties, the tensile strength of the sample is 793.4MPa (average value), the specified plastic elongation is 747.8MPa (average value), and the elongation after fracture is 14.2% (average value).
Application example 1
The riveting has the advantages of simple technological process, stable and reliable connection strength and the like, is the most widely applied connection mode in the field of aviation, and the number of rivets and bolts required for completing the whole assembly of one large airplane is as high as 150-200 ten thousand. The strength of a rivet connection structure on an aircraft often has a significant effect on the overall structural strength of the aircraft. At present, titanium alloy materials are mostly adopted to manufacture aviation connecting pieces, but the defects of high density, high cost and the like exist, and the lightweight requirements of new-generation spacecrafts and large airplanes cannot be met.
The extra-high strength aluminum alloy prepared in the embodiment 2 of the invention is used as a structural material to manufacture a connecting piece for aviation, the strength of the connecting piece can reach more than 800MPa, the elastic modulus exceeds 72GPa, the connecting piece can bear more than 10% of strain without failure, the connecting piece can partially replace a titanium alloy connecting piece, the cost is reduced, the structural weight is reduced by more than 30%, and the extra-high strength aluminum alloy has a wide application prospect in the fields of weaponry, transportation, semiconductors and the like in space flight, aviation and the like.
While specific embodiments of the present invention have been described above, it should be understood that the present invention is not limited to the specific embodiments described above. Various changes or modifications may be made by those skilled in the art within the scope of the claims without departing from the spirit of the invention.
Claims (10)
1. The ultra-high strength aluminum alloy is characterized by comprising the following components in percentage by mass: zinc: 8.0 to 11.0%, copper: 2.5 to 3.0%, magnesium: 1.2 to 2.5%, silver: 0.1 to 0.5%, zirconium: 0.05 to 0.3%, yttrium: 0.05 to 0.3 percent of aluminum and inevitable impurity elements in balance; wherein the mass ratio of zinc to magnesium is controlled to be (4.2-6.5): 1, controlling the mass ratio of copper to magnesium to be (1.0 to 2.5): 1;
the ultra-high-strength aluminum alloy is prepared by the following steps:
(1) Proportioning according to the mass percentage of each component in the alloy; smelting the prepared raw materials in an argon atmosphere at the temperature of 750-820 ℃ to obtain molten metal;
(2) Refining the molten metal obtained in the step (1) in an argon atmosphere at 730-760 ℃ for 10-30min, standing at 710-730 ℃ for 10-30min to obtain a casting liquid, and casting and molding the casting liquid to obtain a cast ingot; carrying out homogenization annealing treatment on the obtained cast ingot in an argon atmosphere to obtain a homogenized cast ingot;
(3) Removing a surface oxide layer from the cast ingot subjected to homogenization treatment in the step (2), and then extruding and forming the cast ingot as a blank to obtain a bar, wherein the extrusion temperature is 400-455 ℃, and the extrusion speed is 10-15m/min during extrusion forming;
(4) And (4) carrying out solid solution treatment, pre-stretching and aging treatment on the bar obtained in the step (3) to obtain the steel bar.
2. A method for preparing a super high strength aluminum alloy is characterized by comprising the following steps:
(1) Proportioning according to the mass percentage of each component in the alloy; smelting the prepared raw materials in an argon atmosphere at the temperature of 750-820 ℃ to obtain molten metal;
(2) Refining the molten metal obtained in the step (1) in an argon atmosphere at 730-760 ℃ for 10-30min, standing at 710-730 ℃ for 10-30min to obtain a casting liquid, and casting and molding the casting liquid to obtain a cast ingot; carrying out homogenization annealing treatment on the obtained cast ingot in an argon atmosphere to obtain a homogenized cast ingot;
(3) Removing a surface oxide layer from the cast ingot subjected to homogenization treatment in the step (2), and then extruding and forming the cast ingot as a blank to obtain a bar, wherein the extrusion temperature is 400-455 ℃, and the extrusion speed is 10-15m/min during extrusion forming;
(4) And (4) carrying out solid solution treatment, pre-stretching and aging treatment on the bar obtained in the step (3) to obtain the steel.
3. The production method according to claim 2, wherein the melting process in the step (1) is: the prepared raw materials are put into a vacuum induction melting furnace, the vacuum degree in the furnace is 0.1 to 10Pa, then argon is introduced until the pressure in the furnace reaches 100 to 250Pa, the temperature is raised to 750 to 820 ℃, and the temperature is kept until molten metal is obtained.
4. The manufacturing method according to claim 2, wherein the homogenizing annealing conditions in the step (2) are: the temperature is kept for 24 to 48h at 420 to 500 ℃, and then the mixture is cooled to room temperature in the air.
5. The preparation method according to claim 4, wherein the homogenizing annealing treatment in the step (2) is a two-stage homogenizing annealing treatment, and the process conditions are as follows: heating for 12 to 24h at 420 to 450 ℃, then heating to 480 to 500 ℃, continuing heating for 12 to 24h, and finally cooling to room temperature in the air.
6. The method according to claim 2, wherein the extrusion ratio of the extrusion molding process in the step (3) is 36 to 81.
7. The production method according to claim 2, wherein the deformation amount of the pre-stretching process in the step (4) is controlled to be 3 to 12%.
8. The production method according to claim 2, wherein the solution treatment process in the step (4) is: keeping the temperature for 1 to 3 hours at the temperature of 455 to 490 ℃, and then carrying out water quenching; the aging treatment process comprises the following steps: keeping the temperature for 12 to 24h under the temperature condition of 110 to 150 ℃.
9. The production method according to claim 8, wherein the water quenching cooling water temperature is 45 to 65 ℃ and the water quenching transfer time is 10 to 30s during the solution treatment.
10. Use of the extra high strength aluminum alloy of claim 1 in the manufacture of aerospace connection structures.
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|---|---|---|---|---|
| WO1997005296A1 (en) * | 1995-08-01 | 1997-02-13 | Feinguss Blank Gmbh | Aluminium alloys for producing fibre composites |
| CN103305732A (en) * | 2013-05-16 | 2013-09-18 | 天津立中合金集团有限公司 | Method for preparing rare-earth yttrium containing super-high-strength wrought aluminium alloy |
| CN103305731A (en) * | 2013-05-16 | 2013-09-18 | 天津立中合金集团有限公司 | Ultra-high-strength wrought aluminum alloy containing rare-earth yttrium |
| CN108425050B (en) * | 2018-03-22 | 2020-03-10 | 郑州轻研合金科技有限公司 | High-strength high-toughness aluminum lithium alloy and preparation method thereof |
| CN109898000B (en) * | 2019-03-29 | 2020-12-15 | 郑州轻研合金科技有限公司 | Ultrahigh-strength heat-resistant aluminum alloy and preparation method thereof |
| CN110699575B (en) * | 2019-09-27 | 2020-12-29 | 黄山市龙跃铜业有限公司 | High-strength and high-toughness aluminum alloy and preparation method thereof |
| CN110863128B (en) * | 2019-12-28 | 2021-06-04 | 东北轻合金有限责任公司 | Preparation method of 640 MPa-grade aluminum alloy extruded material for aviation |
| CN111676400B (en) * | 2020-04-26 | 2021-10-12 | 西北铝业有限责任公司 | Aluminum alloy section for stringer of upper panel of large aircraft wing and preparation method thereof |
| CN113737068B (en) * | 2021-08-19 | 2022-10-04 | 中铝材料应用研究院有限公司 | High-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy and processing method thereof |
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