CN113621854A - Low-density high-modulus high-strength aluminum alloy and preparation method thereof - Google Patents
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- 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
Abstract
The invention relates to a low-density high-modulus high-strength aluminum alloy and a preparation method thereof. The alloy comprises the following components in percentage by mass: li: 2.5-3.5%, Be 0.2-1.5%, Mn: 1-3%, Mg 0.05-2.0%, Zr: 0.05-0.15%, Sc: 0.05-0.15% and the balance of Al; wherein Li, Be, Mn and Mg are necessary elements for reducing the density of the aluminum alloy and improving the modulus and the strength, and Zr and Sc are grain refining elements. The preparation method comprises the following steps: weighing the components according to the designed aluminum alloy component proportion, adopting vacuum melting or atmospheric melting, casting and forming an ingot, and then carrying out annealing treatment, hot extrusion, solid solution and time-effect heat treatment. According to the invention, the aging-strengthened low-density high-modulus high-strength aluminum alloy with excellent performance is finally obtained by regulating and controlling the contents of alloy elements (Li, Be, Mn and Mg) for reducing the density and improving the modulus and the strength and grain refining elements Zr and Sc and by the synergistic treatment of the process conditions of annealing, solid solution and aging treatment.
Description
Technical Field
The invention relates to a low-density high-modulus high-strength aluminum alloy and a preparation method thereof, belonging to the technical field of preparation of metal structure materials.
Background
The aluminum alloy is used as a lightweight structural material for vehicles such as aerospace vehicles, ground traffic vehicles and the like, and has high cost performance and wide application range. The low-density high-modulus high-strength aluminum alloy plays a decisive role in realizing weight reduction, efficiency improvement and long service life of a vehicle structure. The high strength is a common characteristic of high-performance aluminum alloy, the elasticity modulus of the aluminum alloy is greatly improved and the density is reduced under the similar strength condition, and the high-strength aluminum alloy is a main development direction for realizing the weight reduction of a delivery vehicle.
The high-strength aluminum alloy for a vehicle mainly comprises Al-Zn-Mg-Cu series aluminum alloy, Al-Cu-Mg series and Al-Li series alloy. The tensile strength of the Al-Zn-Mg-Cu aluminum alloy can reach 700MPa, but the Al-Zn-Mg-Cu aluminum alloy has lower elastic modulus (lower than 71GPa) and higher density (more than 2.8 g/cm)3). The tensile strength of the Al-Cu-Mg series aluminum alloy is lower than 550MPa, the elastic modulus is lower than 71GPa, and the density is higher than 2.75g/cm3The Al-Li alloy has a tensile strength and an elastic modulus of 600MPa to 78GPa, but has a modulus which is further improved.
Chinese patent No. CN201711159037.9 (patent No. CN201711159037.9) mentions a high-strength high-elasticity modulus aluminum alloy and a preparation method thereof, although the elasticity modulus can reach 90GPa, the tensile strength and the yield strength are obviously lower, respectively only 400MPa, and the yield strength reaches 360 MPa. Chinese patent (CN201711047739.8) mentions a high elastic modulus cast aluminum alloy, which is realized by adding tungsten, nickel and cobalt with high melting point (more than 1800 ℃), although its modulus is high, and the melting point of aluminum is lower than 700 ℃, which results in low plasticity of the cast alloy, obviously unable to be realized by conventional aluminum alloy industrialized method, and is not suitable for mass production. Chinese patent No. CN202011487861.9 (patent No. CN202011487861.9) mentions a high specific modulus aluminum alloy and a preparation method thereof, and although the elastic modulus can reach 89GPa, the tensile strength and the yield strength are obviously lower. Chinese patent (CN202011487859.1) mentions a high specific strength and high specific modulus aluminum alloy and a preparation method thereof, although the strength and the modulus are high, the difficulty of the casting process of the alloy is increased due to the addition of high-content Mg element, and the density of the alloy is larger due to the addition of high-density Cu element.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a low-density high-modulus high-strength aluminum alloy and a preparation method thereof. The invention has simple preparation process and can be used as a low-density high-modulus high-strength lightweight structural material.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a low-density high-modulus high-strength aluminum alloy which comprises the following components in percentage by weight: li: 2.5-3.5%, Be 0.2-1.5%, Mn: 1-3%, Mg 0.05-2.0%, Zr: 0.05-0.15%, Sc: 0.05-0.15% and the balance of Al.
In the low-density high-modulus high-strength aluminum alloy provided by the invention, Li, Be, Mn and Mg are necessary elements and directly influence the elastic modulus, density and strength of an aluminum matrix alloy, Zr and Sc are crystal grain regulating elements and are used for refining crystal grains of an aluminum matrix, and the low-density high-modulus high-strength aluminum alloy is finally formed under the cooperation of the two aspects.
In the invention, beryllium (0.2-1.5%) is originally added, and the inventor finds that on one hand, the beryllium in the range can improve the high elastic modulus of the aluminum alloy and reduce the density, but the beryllium cannot be undissolved in an aluminum matrix, so the addition amount needs to be controlled, and the strength of the material is reduced by excessively adding the beryllium; on the other hand, in the conventional high-temperature smelting process, the addition of trace beryllium (0.001%) can protect the melt and reduce the oxidation of the alloy, further, the reduction of the oxygen content can improve the performance of the alloy material, and the smelting in the atmospheric environment can be realized. And 1-3% of manganese is added into the alloy to form fine Al in the alloy6Mn、Al4Mn and other high modulus compounds, thereby improving the elastic modulus of the matrix alloy. 2.5-3.5% of Li is added into the alloy, so that on one hand, the overall density of the alloy is reduced, and on the other hand, high-modulus Al is precipitated from the alloy in the subsequent heat treatment process3A Li phase. While the addition of trace Mg mainly reduces the matrixThe density of the alloy is improved, and the strength is improved.
The invention relates to a low-density high-modulus high-strength aluminum alloy which comprises the following components in percentage by weight: li: 2.5-3.5%, Be 0.2-1.5%, Mn: 1 to 2.5%, Mg 0.05 to 1.0%, Zr: 0.05-0.15%, Sc: 0.05-0.15% and the balance of Al. Under the condition of the component proportion, the performance of the finally obtained alloy material is optimal.
The invention relates to a low-density high-modulus high-strength aluminum alloy, the density of which is less than or equal to 2.6g/cm3The tensile strength is more than or equal to 535MPa, the yield strength is more than or equal to 446MPa, the elastic modulus is more than or equal to 83, and the elongation is more than or equal to 6.7%.
According to the preferred scheme, the density of the high-strength aluminum alloy is 2.48-2.58 g/cm3The tensile strength is 535-550 MPa, the yield strength is 446-492 MPa, the elastic modulus is 83-87, and the elongation is 6.7-9.2%.
It can be seen that under optimised conditions the density of the alloy provided by the present invention is less than 2.6g/cm3The tensile strength reaches 550MPa, the yield strength reaches 480MPa, and the elastic modulus reaches 87 GPa.
The invention relates to a preparation method of a low-density high-modulus high-strength aluminum alloy, which comprises the following steps: weighing the components according to the designed aluminum alloy component ratio, melting aluminum, lithium, aluminum-manganese intermediate alloy, aluminum-beryllium intermediate alloy, magnesium, aluminum-zirconium intermediate alloy and aluminum-scandium intermediate alloy by adopting a melting method under a vacuum environment or an atmosphere environment protected by inert gas, then filling argon into the melt for composite degassing and deslagging treatment, standing, casting and forming to obtain an ingot, and then carrying out annealing treatment, hot extrusion deformation, solid solution treatment and aging treatment on the ingot to obtain the high-strength aluminum alloy.
According to the preparation method, the ingot is obtained by a smelting method, because a small amount of beryllium is added, the oxidation of the alloy in the smelting process can be greatly reduced, the alloy performance is improved, and in the subsequent heat treatment process, the inventor finds that the composition advantages of the invention can be furthest exerted by adopting the combination of annealing treatment, hot extrusion deformation, solution treatment and aging treatment, and finally the low-oxygen-content, low-density, high-modulus and high-strength aluminum alloy is obtained under the coordination of the components and the process.
According to the preparation method of the low-density high-modulus high-strength aluminum alloy, the annealing temperature is 450-510 ℃, and the annealing time is 24-48 hours.
As a preferred scheme, the preparation method of the low-density high-modulus high-strength aluminum alloy has the advantages that the hot extrusion deformation temperature is 440-480 ℃, and the extrusion ratio is more than or equal to 5.
According to the preparation method of the low-density high-modulus high-strength aluminum alloy, the temperature of the solution treatment is 480-520 ℃, and the time of the solution treatment is 1-3 hours. And after the solution treatment is finished, cooling the water to room temperature.
According to the preparation method of the low-density high-modulus high-strength aluminum alloy, the temperature of the aging treatment is 130-160 ℃, and the time of the aging treatment is 10-200 h.
The density of the low-density high-modulus high-strength aluminum alloy prepared by the process method is lower than 2.6g/cm after subsequent thermomechanical treatment3The tensile strength reaches 550MPa, the yield strength reaches 480MPa, and the elastic modulus reaches 87 GPa.
The invention has the characteristics that:
the aging strengthening type aluminum alloy with excellent performance is obtained by regulating and controlling the content and proportion of main elements (Li, Be, Mn and Mg) and the content of grain refining elements (Zr and Sc), ingot annealing process, solid solution process and aging treatment process conditions of the low-density high-modulus high-strength aluminum alloy prepared by the process method, and the prepared aluminum alloy has excellent low density, high modulus and high strength.
Detailed Description
Comparative example 1
A typical 7085 aluminum-zinc-magnesium alloy of Al-Zn-Mg-Cu series is adopted, the components of the alloy are Al-7.5Zn-1.5Mg-1.6Cu-0.2Zr, and raw materials are added in the forms of A00 pure aluminum, industrial pure magnesium, pure zinc, Al-5Cu alloy, Al-4Zr alloy and the like. Alloy melting is carried out in a resistance furnace and the melt is cast into a hot metal mold at a temperature of 720 ℃. Homogenizing the cast ingot at 450 ℃ for 24h, then hot-extruding the cast ingot into a bar at 430 ℃ in an extrusion ratio of 10, carrying out solution treatment on the alloy, then carrying out water quenching at room temperature, and carrying out aging treatment at 120 ℃ for 24 h. The density, elastic modulus and room temperature tensile property of the material are shown in table 1, and the oxygen content in the alloy is 0.08%.
Comparative example 2
A typical Al-Li alloy is adopted, the composition of the Al-Li alloy is Al-2.2Li-5.0Mg-0.1Zr, and raw materials are added in the form of A00 pure aluminum, industrial pure magnesium, Al-10Mn, Al-4Zr alloy and the like. Alloy smelting is carried out in a vacuum smelting furnace for smelting and casting, then the alloy is hot rolled into a plate with the thickness of 5mm, the alloy is subjected to solution treatment and then water quenching at room temperature, and the aging treatment is carried out for 48 hours at the temperature of 145 ℃. The density, elastic modulus and room temperature tensile property of the material are shown in table 1, and the oxygen content in the alloy is 0.09%.
Comparative example 3
A typical Al-Cu-Mg alloy is adopted, the components of the alloy are Al-3.8Cu-0.36Ag-1.1Li-0.36Mg-0.1Zr, and raw materials are added in the forms of A00 pure aluminum, industrial pure magnesium, pure silver, Al-50Cu, Al-10Li and Al-4Zr alloy and the like. Alloy smelting is carried out in a vacuum smelting furnace for smelting and casting, then the alloy is hot rolled into a plate with the thickness of 30mm, the alloy is subjected to solution treatment and then water quenching at room temperature, and the aging treatment is carried out for 32h at the temperature of 145 ℃. The density, elastic modulus and room temperature tensile property of the material are shown in table 1, and the oxygen content in the alloy is 0.07%.
Comparative example 4
The typical high specific strength aluminum alloy with high specific modulus mentioned in Chinese patent (CN202011487859.1) is composed of Al-4Li-3Mn-0.05Zr-0.15Ti-0.3 Sc. The raw materials are added in the forms of pure aluminum, pure lithium, Al-10Mn alloy, Al-5Ti alloy, Al-4Zr alloy, Al-2Sc alloy and the like. Smelting the alloy in a vacuum smelting furnace, smelting and casting, then hot-extruding into a bar at 440 ℃ in an extrusion ratio of 5, carrying out water quenching at room temperature after the alloy is subjected to solution treatment, and carrying out aging treatment for 20 hours at 170 ℃. The density, modulus of elasticity and room temperature tensile properties of the materials are shown in Table 1. The oxygen content in the alloy is 0.07%.
Comparative example 5
The alloy comprises the components of, by weight, Al-2.5Li-0.15Be-1Mn-0.05Mg-0.05Zr-0.05 Sc. The preparation method comprises the following steps: under vacuum, putting pure aluminum, pure lithium, pure magnesium, aluminum beryllium intermediate alloy, aluminum manganese intermediate alloy, aluminum zirconium intermediate alloy and aluminum scandium intermediate alloy into a smelting furnace for melting, degassing and deslagging through argon, standing and casting for forming. Annealing the cast ingot, wherein the soaking process comprises the following steps: keeping the temperature at 450 ℃ for 48 h. The annealed ingot was extruded into a rod at 440 ℃ in an extrusion ratio of 5. The hot extrusion bar alloy is insulated for 3 hours at 480 ℃. After the solution treatment is finished, cooling the mixture to room temperature by water, and then cooling the mixture at 130 ℃ for 200 hours to obtain a finished product. The density, elastic modulus and room temperature tensile property of the material are shown in table 1, and the oxygen content in the alloy is 0.05%.
Comparative example 6
The alloy comprises the components of, by weight, Al-4Li-0.2Be-1Mn-0.05Mg-0.05Zr-0.05 Sc. The preparation method comprises the following steps: under vacuum, putting pure aluminum, pure lithium, pure magnesium, aluminum beryllium intermediate alloy, aluminum manganese intermediate alloy, aluminum zirconium intermediate alloy and aluminum scandium intermediate alloy into a smelting furnace for melting, degassing and deslagging through argon, standing and casting for forming. Annealing the cast ingot, wherein the soaking process comprises the following steps: keeping the temperature at 450 ℃ for 48 h. The annealed ingot was extruded into a rod at 440 ℃ in an extrusion ratio of 5. The hot extrusion bar alloy is insulated for 3 hours at 480 ℃. After the solution treatment is finished, cooling the mixture to room temperature by water, and then cooling the mixture at 130 ℃ for 200 hours to obtain a finished product. The density, elastic modulus and room temperature tensile property of the material are shown in table 1, and the oxygen content in the alloy is 0.06%.
Example 1
The alloy comprises the components of, by weight, Al-2.5Li-0.2Be-1Mn-0.05Mg-0.05Zr-0.05 Sc. The preparation method comprises the following steps: under vacuum, putting pure aluminum, pure lithium, pure magnesium, aluminum beryllium intermediate alloy, aluminum manganese intermediate alloy, aluminum zirconium intermediate alloy and aluminum scandium intermediate alloy into a smelting furnace for melting, degassing and deslagging through argon, standing and casting for forming. Annealing the cast ingot, wherein the soaking process comprises the following steps: keeping the temperature at 450 ℃ for 48 h. The annealed ingot was extruded into a rod at 440 ℃ in an extrusion ratio of 5. The hot extrusion bar alloy is insulated for 3 hours at 480 ℃. After the solution treatment is finished, cooling the mixture to room temperature by water, and then cooling the mixture at 130 ℃ for 200 hours to obtain a finished product. The density, elastic modulus and room temperature tensile property of the material are shown in Table 1, and the oxygen content in the alloy is 0.008%.
Example 2
The alloy comprises the components of, by weight, Al-2.5Li-0.2Be-1Mn-0.05Mg-0.05Zr-0.05 Sc. The preparation method comprises the following steps: under the atmospheric environment, under the protection of argon, putting pure aluminum, pure lithium, pure magnesium, aluminum-beryllium intermediate alloy, aluminum-manganese intermediate alloy, aluminum-zirconium intermediate alloy and aluminum-scandium intermediate alloy into a smelting furnace for melting, degassing and deslagging through argon, and standing, casting and forming. Annealing the cast ingot, wherein the soaking process comprises the following steps: keeping the temperature at 440 ℃ for 48 h. The annealed ingot was extruded into a rod at 450 ℃ at an extrusion ratio of 10. The hot extrusion bar alloy is insulated for 3 hours at 480 ℃. After the solution treatment is finished, cooling the mixture to room temperature by water, and then cooling the mixture at 130 ℃ for 200 hours to obtain a finished product. The density, elastic modulus and room temperature tensile property of the material are shown in Table 1, and the oxygen content in the alloy is 0.008%.
Example 3
The alloy comprises the components of, by weight, Al-3.5Li-1.5Be-2.5Mn-0.05Mg-0.15r-0.15 Sc. The preparation method comprises the following steps: under the vacuum environment, putting pure aluminum, pure lithium, pure magnesium, aluminum beryllium intermediate alloy, aluminum manganese intermediate alloy, aluminum zirconium intermediate alloy and aluminum scandium intermediate alloy into a smelting furnace for melting, degassing and deslagging through argon gas, standing and casting for forming. Annealing the cast ingot, wherein the soaking process comprises the following steps: and keeping the temperature at 510 ℃ for 24 h. The annealed ingot was extruded into a rod at 480 ℃ in an extrusion ratio of 15. The hot extruded bar alloy was held at 520 ℃ for 2 h. After the solution treatment is finished, cooling to room temperature by water, and then cooling at 145 ℃ for 68h to obtain a finished product. The density, elastic modulus and room temperature tensile property of the material are shown in Table 1, and the oxygen content in the alloy is 0.003%.
Example 4
The alloy comprises the components of Al-3Li-1.0Be-1.5Mn-0.05Mg-0.1Zr-0.1Sc in percentage by weight. The preparation method comprises the following steps: under the vacuum environment, putting pure aluminum, pure lithium, pure magnesium, aluminum beryllium intermediate alloy, aluminum manganese intermediate alloy, aluminum zirconium intermediate alloy and aluminum scandium intermediate alloy into a smelting furnace for melting, degassing and deslagging through argon gas, standing and casting for forming. Annealing the cast ingot, wherein the soaking process comprises the following steps: keeping the temperature at 490 ℃ for 36 h. The annealed ingot was extruded into a rod at 460 ℃ in an extrusion ratio of 20. The hot extruded bar alloy was held at 510 ℃ for 2 h. After the solution treatment is finished, cooling the mixture to room temperature by water, and then cooling the mixture at 160 ℃ for 10 hours to obtain a finished product. The density, elastic modulus and room temperature tensile property of the material are shown in Table 1, and the oxygen content in the alloy is 0.005%.
Example 5
The alloy comprises the components of Al-3Li-1.0Be-1.5Mn-0.05Mg-0.1Zr-0.1Sc in percentage by weight. The preparation method comprises the following steps: under the atmospheric environment, under the protection of argon, putting pure aluminum, pure lithium, pure magnesium, aluminum-beryllium intermediate alloy, aluminum-manganese intermediate alloy, aluminum-zirconium intermediate alloy and aluminum-scandium intermediate alloy into a smelting furnace for melting, degassing and deslagging through argon, and standing, casting and forming. Annealing the cast ingot, wherein the soaking process comprises the following steps: keeping the temperature at 490 ℃ for 36 h. The annealed ingot was extruded into a rod at 460 ℃ in an extrusion ratio of 9. The hot extruded bar alloy was held at 510 ℃ for 2 h. After the solution treatment is finished, cooling the mixture to room temperature by water, and then cooling the mixture at 160 ℃ for 10 hours to obtain a finished product. The density, elastic modulus and room temperature tensile property of the material are shown in Table 1, and the oxygen content in the alloy is 0.007%.
Example 6
The alloy comprises the components of Al-3Li-1.0Be-1.2Mn-2.0Mg-0.1Zr-0.1Sc in percentage by weight. The preparation method comprises the following steps: under the atmospheric environment, under the protection of argon, putting pure aluminum, pure lithium, pure magnesium, aluminum-beryllium intermediate alloy, aluminum-manganese intermediate alloy, aluminum-zirconium intermediate alloy and aluminum-scandium intermediate alloy into a smelting furnace for melting, degassing and deslagging through argon, and standing, casting and forming. Annealing the cast ingot, wherein the soaking process comprises the following steps: keeping the temperature at 500 ℃ for 24 h. The annealed ingot was extruded into a rod at 460 ℃ in an extrusion ratio of 10. The hot extruded bar alloy was held at 520 ℃ for 2 h. After the solution treatment is finished, cooling the mixture to room temperature by water, and then cooling the mixture at 145 ℃ for 100 hours to obtain a finished product. The density, elastic modulus and room temperature tensile property of the material are shown in Table 1, and the oxygen content in the alloy is 0.005%.
Example 7
The alloy comprises the components of Al-3Li-1.0Be-1.2Mn-1.0Mg-0.1Zr-0.1Sc in percentage by weight. The preparation method comprises the following steps: under the atmospheric environment, under the protection of argon, putting pure aluminum, pure lithium, pure magnesium, aluminum-beryllium intermediate alloy, aluminum-manganese intermediate alloy, aluminum-zirconium intermediate alloy and aluminum-scandium intermediate alloy into a smelting furnace for melting, degassing and deslagging through argon, and standing, casting and forming. Annealing the cast ingot, wherein the soaking process comprises the following steps: keeping the temperature at 500 ℃ for 24 h. The annealed ingot was extruded into a rod at 460 ℃ in an extrusion ratio of 12. The hot extruded bar alloy was held at 520 ℃ for 2 h. After the solution treatment is finished, cooling the mixture to room temperature by water, and then cooling the mixture at 145 ℃ for 100 hours to obtain a finished product. The density, elastic modulus and room temperature tensile property of the material are shown in Table 1, and the oxygen content in the alloy is 0.003%.
TABLE 1 Properties of the alloys of the invention
Comparing the values of the performance parameters of the examples with those of the comparative examples, it can be seen that: the comprehensive properties of the aluminum alloy prepared by the invention, such as modulus, elastic modulus, room temperature tensile property and the like, are obviously higher than those of the alloy of the comparative example.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A low-density high-modulus high-strength aluminum alloy is characterized in that: comprises the following components in percentage by weight: li: 2.5-3.5%, Be 0.2-1.5%, Mn: 1-3%, Mg 0.05-2.0%, Zr: 0.05-0.15%, Sc: 0.05-0.15% and the balance of Al.
2. A low density, high modulus, high strength aluminum alloy according to claim 1, wherein: comprises the following components in percentage by weight: li: 2.5-3.5%, Be 0.2-1.5%, Mn: 1 to 2.5%, Mg 0.05 to 1.0%, Zr: 0.05-0.15%, Sc: 0.05-0.15% and the balance of Al.
3. A low density, high modulus, high strength aluminum alloy according to claim 1, wherein: the density of the high-strength aluminum alloy is less than or equal to2.6g/cm3The tensile strength is more than or equal to 535MPa, the yield strength is more than or equal to 446MPa, the elastic modulus is more than or equal to 83, and the elongation is more than or equal to 6.7%.
4. A low density high modulus high strength aluminum alloy according to claim 3 wherein: the density of the high-strength aluminum alloy is 2.48-2.58 g/cm3The tensile strength is 535-550 MPa, the yield strength is 446-492 MPa, the elastic modulus is 83-87, and the elongation is 6.7-9.2%.
5. A method of making a low density, high modulus, high strength aluminum alloy according to any one of claims 1 to 4, wherein: weighing the components according to the designed aluminum alloy component ratio, melting aluminum, lithium, aluminum-manganese intermediate alloy, aluminum-beryllium intermediate alloy, magnesium, aluminum-zirconium intermediate alloy and aluminum-scandium intermediate alloy by adopting a melting method under a vacuum environment or an atmosphere environment protected by inert gas, then filling argon into the melt for composite degassing and deslagging treatment, standing, casting and forming to obtain an ingot, and then carrying out annealing treatment, hot extrusion deformation, solid solution treatment and aging treatment on the ingot to obtain the high-strength aluminum alloy.
6. A method of making a low density, high modulus, high strength aluminum alloy according to claim 5 wherein: the temperature of the annealing treatment is 450-510 ℃, and the annealing time is 24-48 h.
7. A method of making a low density, high modulus, high strength aluminum alloy according to claim 5 wherein: the temperature of the hot extrusion deformation is 440-480 ℃, and the extrusion ratio is more than or equal to 5.
8. A method of making a low density, high modulus, high strength aluminum alloy according to claim 5 wherein: the temperature of the solid solution treatment is 480-520 ℃, and the time of the solid solution treatment is 1-3 h.
9. A method of making a low density, high modulus, high strength aluminum alloy according to claim 5 wherein: the temperature of the aging treatment is 130-160 ℃, and the time of the aging treatment is 10-200 h.
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| CN115558827A (en) * | 2022-10-18 | 2023-01-03 | 中国航发北京航空材料研究院 | Al-Cu-Mg-Ag-Si-Sc-Mn-Zr high-strength high-heat-resistance aluminum alloy and preparation method thereof |
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| CN115558827A (en) * | 2022-10-18 | 2023-01-03 | 中国航发北京航空材料研究院 | Al-Cu-Mg-Ag-Si-Sc-Mn-Zr high-strength high-heat-resistance aluminum alloy and preparation method thereof |
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