CN115747592A - Isotropic high-strength wrought aluminum alloy and preparation method thereof - Google Patents
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims description 103
- 229910045601 alloy Inorganic materials 0.000 claims description 97
- 238000001125 extrusion Methods 0.000 claims description 36
- 229910052782 aluminium Inorganic materials 0.000 claims description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 24
- 238000005266 casting Methods 0.000 claims description 20
- 230000032683 aging Effects 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000011777 magnesium Substances 0.000 claims description 15
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 14
- 229910052787 antimony Inorganic materials 0.000 claims description 14
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 229910052749 magnesium Inorganic materials 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 238000007514 turning Methods 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 238000000265 homogenisation Methods 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 7
- 239000007769 metal material Substances 0.000 abstract description 2
- 230000018109 developmental process Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 229910052761 rare earth metal Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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Abstract
The invention discloses an isotropic high-strength wrought aluminum alloy and a preparation method thereof, belonging to the technical field of nonferrous metal materials and processing thereof, and comprising the following components by weight percent, cu3.5-5%, mg1.2-2%, mn0.5-0.8%, sc0.3-0.5%, zr0.2-0.4%, and Sb0.1-0.2%; the balance of Al and inevitable impurities. The invention well solves the problems of large anisotropy of the performance, insufficient pressure resistance, low load bearing capacity under complex loads of alternation, multidirectional and the like of the traditional extruded section, and greatly promotes the development of the aluminum alloy.
Description
Technical Field
The invention relates to the technical field of non-ferrous metal materials and processing thereof, in particular to an isotropic high-strength wrought aluminum alloy and a preparation method thereof.
Background
At present, a large number of mainstream processing methods of industrial aluminum alloy products still adopt casting production, such as die casting, extrusion casting, semi-solid thixoforming and the like; there is a great difference between the development potential of wrought aluminium alloys in terms of structural materials and the current situation of practical application.
It is mainly subject to the following significant technical drawbacks: the design of the aluminum alloy component purely according to the tensile property can bring potential safety hazards, particularly, the aluminum alloy component is most seriously shown under the complex load action of alternating load, multidirectional load and the like, the aluminum alloy bearing structural component at the present stage is restrained by the aluminum alloy component and is still obtained by adopting a die-casting or semi-solid mode and the like, the molding limitation of a casting method and a series of problems of large and thick structure, poor strength property, large brittleness, difficult plastic processing and the like of cast aluminum alloy are solved, and the application and popularization of the aluminum alloy are greatly limited.
Therefore, the low-temperature plastic deformation manufacturing technology of the high-strength wrought aluminum alloy is developed, a novel high-strength wrought aluminum alloy material with isotropic mechanical property is developed, the service capacity of the material under complex working conditions is improved, the light-weight high-strength characteristics of the wrought aluminum alloy can be fully exerted, and the material has very practical engineering value.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an isotropic high-strength wrought aluminum alloy and a preparation method thereof; the isotropic high-strength wrought aluminum alloy and the preparation method thereof well solve the problems that the traditional extruded section has large performance anisotropy, insufficient pressure resistance, low load bearing capacity under complex loads of alternating, multidirectional and the like, and greatly promote the development of the aluminum alloy.
In order to solve the technical problem, the isotropic high-strength wrought aluminum alloy provided by the invention comprises the following components, by weight, 3.5-5% of Cu3, 1.2-2% of Mg1, 0.5-0.8% of Mn0, 0.3-0.5% of Sc0, 0.2-0.4% of Zr0, and 0.1-0.2% of Sb0; the balance of Al and inevitable impurities.
The method for preparing the isotropic high-strength wrought aluminum alloy comprises the following steps,
step S1: preheating, namely weighing and preheating pure aluminum, pure magnesium, pure antimony, intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20 Zr;
step S2: smelting, namely melting pure aluminum, adding pure magnesium, pure antimony and intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr when heating to 700-720 ℃, and keeping the temperature until the alloy is completely melted and removing the surface scum; then heating to 730-740 ℃, uniformly stirring, then cooling to 690-700 ℃ and preserving heat to obtain alloy liquid;
and step S3: casting, namely casting the alloy liquid obtained in the step S2 into a mold to obtain an as-cast alloy;
and step S4: homogenizing, namely homogenizing the as-cast alloy obtained in the step S3;
step S5: machining, namely sawing the cast ingot obtained in the step S4 and turning the ingot into a skin for later use;
step S6: extruding, namely processing the aluminum bar obtained in the step S5 according to an extrusion process;
step S7: and (4) aging, namely performing heat treatment on the aluminum bar obtained in the step (S6) according to an aging process.
In a further improvement of the invention, in the step S1, the preheating temperature is 200-300 ℃.
In a further development of the invention, in step S3, the casting is a semi-continuous casting.
In the further improvement of the invention, in the step S4, the homogenization treatment is carried out for 12 to 24 hours at the temperature of 450 to 470 ℃.
In a further improvement of the invention, in the step S5, the size of the ingot after ingot sawing and skin turning is phi 300mm.
In the further improvement of the invention, in the step S6, the extrusion temperature of the extrusion process is 420-460 ℃, and the extrusion speed is 1.5-2.5 m.min -1 The extrusion ratio is 10-20.
In the further improvement of the invention, in the step S7, the aging process is to keep the temperature at 170-180 ℃ for 6-12 h.
Compared with the prior art, the invention has the following beneficial effects:
the invention well solves the problems of large anisotropy of the performance, insufficient pressure resistance, low load bearing capacity under complex loads of alternation, multi-direction and the like of the traditional extruded section, and greatly promotes the development of the aluminum alloy.
Drawings
To more clearly illustrate the background art or the technical solutions of the present invention, the following briefly introduces the prior art or the accompanying drawings used in the detailed description; it should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is to be given the full breadth of the present disclosure, and are not intended to limit the scope of the present disclosure.
FIG. 1 is a photograph of the microstructure of an aluminum alloy material according to example 1 of the present invention.
FIG. 2 is a photograph of the microstructure of an aluminum alloy material according to example 2 of the present invention.
FIG. 3 is a photograph of the microstructure of the aluminum alloy material according to example 3 of the present invention.
FIG. 4 is a photograph of the microstructure of the aluminum alloy material according to example 4 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following will make clear and complete description of the technical solution in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention shall fall within the protection scope of the present invention.
Meanwhile, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like referred to in this specification refer to the orientation or positional relationship indicated on the drawings, which is merely for convenience of description and simplification of description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, it is not to be understood as a limitation of the present invention, and a change or adjustment of the relative relationship thereof, without substantial technical change, should also be considered as the scope in which the present invention can be implemented.
Meanwhile, in the description of the present specification, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected", and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other, so that the specific meaning of the terms in the invention can be understood by those skilled in the art through specific situations.
At present, the development potential of the wrought aluminum alloy in the aspect of structural materials and the actual application status are greatly different; therefore, the manufacturing technology of the low-temperature plastic deformation of the high-strength wrought aluminum alloy is developed, the novel high-strength wrought aluminum alloy material with isotropic mechanical properties is developed, the service capacity of the material under the complex working condition is improved, the light-weight high-strength characteristics of the wrought aluminum alloy can be fully exerted, and the material has a very practical engineering value.
The isotropic high-strength wrought aluminum alloy well solves the problems that the traditional extruded section is large in performance anisotropy, insufficient in pressure resistance, low in load bearing capacity under complex loads such as alternating loads, multidirectional loads and the like, and greatly promotes the development of aluminum alloy.
According to the method for manufacturing the isotropic high-strength wrought aluminum alloy, the high-solid-solution element Mg and the high-solid-solution rare earth element Sc are added into aluminum, after homogenization treatment, an aluminum alloy as-cast blank with high solid solubility is formed, fine and dispersed precipitation phases can be formed in the subsequent plastic processing process and after multistage aging treatment, the strain hardening rate of the alloy is improved, the uniform strain degree of the alloy is improved, and the strength and the elongation of the alloy are improved.
According to the method for manufacturing the isotropic high-strength wrought aluminum alloy, fine dynamic recrystallization grains are obtained through one-time low-temperature pre-extrusion with a large extrusion ratio, the strengthening and elongation rate of the alloy are improved, meanwhile, the production period can be shortened, and the production cost is reduced.
By using the method for manufacturing the isotropic high-strength wrought aluminum alloy, the starting of non-basal plane slippage during plastic deformation is promoted by adding the rare earth element Sc, and the strong texture of the plastic deformation basal plane is greatly weakened through isothermal reciprocating extrusion combining elongation strain and compression strain, so that the anisotropy of mechanical properties caused by the texture is eliminated.
The method for manufacturing the isotropic high-strength wrought aluminum alloy realizes the composite strengthening effect of fine grains, solid solution and dispersed precipitation phases, and simultaneously eliminates the mechanical property anisotropy phenomenon caused by the texture, so that the aluminum alloy has excellent mechanical properties such as isotropic strength, elongation and the like.
The technical scheme is as follows:
an isotropic high-strength wrought aluminum alloy comprises the following components, by weight, 3.5-5% of Cu0.5-2% of Mg1.2-2%, 0.5-0.8% of Mn0.3-0.5% of Sc0.2-0.4% of Zr0, and 0.1-0.2% of Sb0.1; the balance of Al and inevitable impurities.
A method of making an isotropic high strength wrought aluminium alloy comprising the steps of,
step S1: preheating, namely weighing and preheating pure aluminum, pure magnesium, pure antimony, intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20 Zr;
step S2: smelting, namely melting pure aluminum, adding pure magnesium, pure antimony and intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr when heating to 700-720 ℃, and keeping the temperature until the alloy is completely melted and removing surface scum; then heating to 730-740 ℃, uniformly stirring, then cooling to 690-700 ℃ and preserving heat to obtain alloy liquid;
and step S3: casting, namely casting the alloy liquid obtained in the step S2 into a mould to obtain an as-cast alloy;
and step S4: homogenizing, namely homogenizing the cast alloy obtained in the step S3;
step S5: machining, namely sawing the cast ingot obtained in the step S4 and turning the ingot into a skin for later use;
step S6: extruding, namely processing the aluminum bar obtained in the step S5 according to an extrusion process;
step S7: and (5) aging, namely performing heat treatment on the aluminum bar obtained in the step (S6) according to an aging process.
In the step S1, the preheating temperature is 200-300 ℃; in the step S3, the casting is semi-continuous casting; in the step S4, the homogenization treatment is to keep the temperature at 450-470 ℃ for 12-24 h; in the step S5, the size of the ingot after ingot sawing and skin turning is phi 300mm; in step S6, the extrusion temperature of the extrusion process is 420-460 ℃, and the extrusion speed is 1.5-2.5 m.min -1 The extrusion ratio is 10-20; in the step S7, the aging process is to keep the temperature at 170-180 ℃ for 6-12 h.
Example 1
An isotropic high-strength wrought aluminium alloy comprises, by weight, cu3.5%, mg1.2%, mn0.5%, sc0.3%, zr0.2%, and Sb0.1%, with the balance being Al and unavoidable impurity elements.
The preparation method of the isotropic high-strength wrought aluminum alloy comprises the following steps:
step S1: preheating, namely weighing and preheating pure aluminum, pure magnesium, pure antimony, intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr by 250 ℃;
step S2: smelting, namely melting pure aluminum, adding pure magnesium, pure antimony and intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr when heating to 700 ℃, and keeping the temperature until the alloy is completely melted to remove surface scum; then heating to 740 ℃, stirring uniformly, then cooling to 690 ℃, and preserving heat to obtain alloy liquid;
and step S3: casting, namely casting the alloy liquid obtained in the step S2 into a mould to obtain an as-cast alloy;
and step S4: homogenizing, namely homogenizing the cast alloy obtained in the step S3, and keeping the temperature for 24 hours at 450 ℃;
step S5: machining, namely sawing and turning the cast ingot obtained in the step S4 to obtain a ingot with the diameter of 300mm;
step S6: extruding, namely performing extrusion process treatment on the aluminum bar obtained in the step S5, wherein the extrusion temperature is 450 ℃, and the extrusion speed is 1.5 m.min -1 The extrusion ratio is 15.
Step S7: and (5) aging, namely performing aging process treatment on the aluminum bar obtained in the step S6: keeping the temperature at 180 ℃ for 6h.
Example 2
An isotropic high-strength wrought aluminium alloy comprises, by weight, 4.0% of Cu0, 1.5% of Mg1, 0.6% of Mn0, 0.4% of Sc0, 0.3% of Zr0, 0.1% of Sb0, and the balance of Al and unavoidable impurity elements.
The preparation method of the isotropic high-strength wrought aluminum alloy comprises the following steps:
step S1: preheating, namely weighing and preheating pure aluminum, pure magnesium, pure antimony, intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr by 250 ℃;
step S2: smelting, namely melting pure aluminum, adding pure magnesium, pure antimony and intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr when heating to 720 ℃, and keeping the temperature until the alloy is completely melted and removing surface scum; then heating to 740 ℃, uniformly stirring, then cooling to 700 ℃ and preserving heat to obtain alloy liquid;
and step S3: casting, namely casting the alloy liquid obtained in the step S2 into a mold to obtain an as-cast alloy;
and step S4: homogenizing, namely homogenizing the cast alloy obtained in the step S3, and preserving heat for 24 hours at 470 ℃;
step S5: machining, namely sawing and turning the cast ingot obtained in the step S4 to obtain a ingot with the diameter of 300mm;
step S6: and (5) extruding, namely performing extrusion process treatment on the aluminum bar obtained in the step S5: the extrusion temperature is 450 ℃, and the extrusion speed is 2.0 m.min -1 The extrusion ratio is 15.
Step S7: and (5) aging, namely performing aging process treatment on the aluminum bar obtained in the step S6: keeping the temperature at 170 ℃ for 8h.
Example 3
An isotropic high-strength wrought aluminum alloy comprises, by weight, cu4.5%, mg1.8%, mn0.7%, sc0.4%, zr0.3%, and Sb0.2%, with the balance being Al and unavoidable impurity elements.
The preparation method of the isotropic high-strength wrought aluminum alloy comprises the following steps:
step S1: preheating, namely weighing and preheating pure aluminum, pure magnesium, pure antimony, intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr by 250 ℃;
step S2: smelting, namely melting pure aluminum, adding pure magnesium, pure antimony and intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr when heating to 710 ℃, and keeping the temperature until the alloy is completely melted to remove surface scum; then heating to 740 ℃, uniformly stirring, then cooling to 700 ℃ and preserving heat to obtain alloy liquid;
and step S3: casting, namely casting the alloy liquid obtained in the step S2 into a mold to obtain an as-cast alloy;
and step S4: homogenizing, namely homogenizing the cast alloy obtained in the step S3, and preserving heat for 24 hours at 470 ℃;
step S5: machining, namely sawing and turning the cast ingot obtained in the step S4 to obtain a ingot with the diameter of 300mm;
step S6: and (3) extruding, namely performing extrusion process treatment on the aluminum bar obtained in the step S5: the extrusion temperature is 460 ℃, and the extrusion speed is 2.5 m.min -1 The extrusion ratio was 15.
Step S7: and (5) aging, namely performing aging process treatment on the aluminum bar obtained in the step S6: keeping the temperature at 180 ℃ for 6h.
Example 4
An isotropic high-strength wrought aluminum alloy comprises, by weight, 5% of Cu, 1.2-2% of Mg1, 0.8% of Mn0.5%, 0.5% of Sc, 0.4% of Zr2, and 0.2% of Sb0, and the balance of Al and unavoidable impurity elements.
The preparation method of the isotropic high-strength wrought aluminum alloy comprises the following steps:
step S1: preheating, namely weighing and preheating pure aluminum, pure magnesium, pure antimony, intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr to 250 ℃;
step S2: smelting, namely melting pure aluminum, adding pure magnesium, pure antimony and intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr when heating to 720 ℃, and keeping the temperature until the alloy is completely melted and removing surface scum; then heating to 730-740 ℃, uniformly stirring, then cooling to 700 ℃ and preserving heat to obtain alloy liquid;
and step S3: casting, namely casting the alloy liquid obtained in the step S2 into a mould to obtain an as-cast alloy;
and step S4: homogenizing, namely homogenizing the cast alloy obtained in the step S3, and preserving heat for 24 hours at 470 ℃;
step S5: machining, namely sawing and turning the cast ingot obtained in the step S4 to obtain a ingot with the diameter of 300mm;
step S6: and (5) extruding, namely performing extrusion process treatment on the aluminum bar obtained in the step S5: the extrusion temperature is 460 ℃, the extrusion speed is 2.5 m.min < -1 >, and the extrusion ratio is 15.
Step S7: and (4) aging, namely performing aging process treatment on the aluminum bar obtained in the step S6: keeping the temperature at 180 ℃ for 6h.
As shown in FIGS. 1 to 4, the tensile test was conducted on the aluminum alloy sheet prepared in the comparative example and the aluminum alloy profiles prepared in examples 1, 2, 3 and 4 using a CMT5105 to 300kN microcomputer controlled electronic universal tester, and the test results are shown in Table 1.
TABLE 1 mechanical Property test results of the samples
| Alloy (I) | Tensile strength | Yield strength | Elongation percentage |
| Example 1 | 576 | 492 | 8.3 |
| Example 2 | 581 | 485 | 7.8 |
| Example 3 | 595 | 512 | 7.2 |
| Example 4 | 589 | 488 | 7.3 |
The method solves the technical problem that the high-temperature mechanical property of the aluminum alloy is poor in the prior art, and improves the thermal property, the mechanical property and the stability of the rare earth aluminum alloy; by controlling the Sc content in the aluminum alloy, the uniformity of the microstructure and the smaller grain size of the finally prepared aluminum alloy are ensured, the basal plane texture is converted into the rare earth texture, the non-basal plane slippage opening is promoted, the high plasticity is shown, the strength is not sacrificed when the plasticity is improved, and the tensile strength of the alloy is improved; in addition, the raw materials used for preparing the aluminum alloy are low in cost, the plasticity of the aluminum alloy can be obviously changed by only adding a small amount of rare earth elements, the preparation method is simple, only one-time traditional extrusion is needed, no complex processing technology is needed, the transportability is strong, and the method is convenient to realize in industry.
Although the present invention has been described in detail with reference to the preferred embodiments and the accompanying drawings, the present invention is not limited thereto, and those skilled in the art can make various equivalent modifications or substitutions on the embodiments of the present invention without departing from the spirit and scope of the present invention, and those modifications or substitutions should be considered as being within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and therefore, the scope of the present invention should be determined by the scope of the appended claims.
Claims (8)
1. An isotropic high-strength wrought aluminum alloy is characterized by comprising, by weight, 3.5-5% of Cu0.2-2% of Mg1.2, 0.5-0.8% of Mn0.3-0.5% of Sc0.2-0.4% of Zr0.1-0.2% of Sb0.1-0.2%; the balance of Al and inevitable impurities.
2. A method of making an isotropic high strength wrought aluminium alloy according to claim 1, comprising the steps of,
step S1: preheating, namely weighing and preheating pure aluminum, pure magnesium, pure antimony, intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20 Zr;
step S2: smelting, namely melting pure aluminum, adding pure magnesium, pure antimony and intermediate alloy Al-25Cu, intermediate alloy Al-20Mn, intermediate alloy Al-20Sc and intermediate alloy Al-20Zr when heating to 700-720 ℃, and keeping the temperature until the alloy is completely melted and removing surface scum; then heating to 730-740 ℃, stirring uniformly, then cooling to 690-700 ℃ and preserving heat to obtain alloy liquid;
and step S3: casting, namely casting the alloy liquid obtained in the step S2 into a mould to obtain an as-cast alloy;
and step S4: homogenizing, namely homogenizing the as-cast alloy obtained in the step S3;
step S5: machining, namely sawing the cast ingot obtained in the step S4 and turning the ingot into a skin for later use;
step S6: extruding, namely processing the aluminum bar obtained in the step S5 according to an extrusion process;
step S7: and (5) aging, namely performing heat treatment on the aluminum bar obtained in the step (S6) according to an aging process.
3. The method of claim 2, wherein the preheating temperature in step S1 is 200-300 ℃.
4. The method of producing an isotropic high-strength wrought aluminum alloy according to claim 2, wherein in step S3, the casting is semi-continuous casting.
5. The method of claim 2, wherein the homogenization treatment is performed by keeping the temperature of 450-470 ℃ for 12-24 hours in step S4.
6. The method according to claim 2, wherein in step S5, the ingot size after sawing and turning the ingot is Φ 300mm.
7. Isotropic high strength according to claim 2The preparation method of the wrought aluminum alloy is characterized in that in the step S6, the extrusion temperature of the extrusion process is 420-460 ℃, and the extrusion speed is 1.5-2.5 m.min -1 The extrusion ratio is 10-20.
8. The method for preparing an isotropic high-strength wrought aluminium alloy according to claim 2, wherein in step S7, the aging process is performed by holding at 170-180 ℃ for 6-12 h.
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| CN105441759A (en) * | 2015-11-27 | 2016-03-30 | 天津大学 | Sc-containing high-strength Al-Cu-Mg-Mn-Zr alloy and preparation method thereof |
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| WO2022041268A1 (en) * | 2020-08-30 | 2022-03-03 | 中南大学 | High-strength al-cu-mg-mn aluminum alloy and preparation method therefor |
| CN113564438A (en) * | 2021-07-15 | 2021-10-29 | 烟台南山学院 | Economical flame-retardant large-deformation aluminum alloy material and preparation method thereof |
| CN114875286A (en) * | 2022-05-30 | 2022-08-09 | 山东南山铝业股份有限公司 | Rare earth-free low-alloy high-strength and high-toughness aluminum alloy and preparation method thereof |
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