CN116574944A - Heat treatment-free aluminum alloy for new energy automobile battery pack and preparation method thereof - Google Patents
Heat treatment-free aluminum alloy for new energy automobile battery pack and preparation method thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 94
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 238000004512 die casting Methods 0.000 claims abstract description 104
- 239000012535 impurity Substances 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000000956 alloy Substances 0.000 claims description 195
- 229910045601 alloy Inorganic materials 0.000 claims description 189
- 229910052782 aluminium Inorganic materials 0.000 claims description 63
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 62
- 238000005266 casting Methods 0.000 claims description 51
- 238000002844 melting Methods 0.000 claims description 49
- 230000008018 melting Effects 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 41
- 238000007872 degassing Methods 0.000 claims description 36
- 238000012360 testing method Methods 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 31
- 238000007670 refining Methods 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 27
- 229910052710 silicon Inorganic materials 0.000 claims description 27
- 238000003825 pressing Methods 0.000 claims description 24
- 238000005070 sampling Methods 0.000 claims description 24
- 239000010703 silicon Substances 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 22
- 229910052720 vanadium Inorganic materials 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000000155 melt Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 13
- 229910018182 Al—Cu Inorganic materials 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 239000011888 foil Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 230000003595 spectral effect Effects 0.000 claims description 12
- 238000009864 tensile test Methods 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 35
- 230000000052 comparative effect Effects 0.000 description 27
- 229910018575 Al—Ti Inorganic materials 0.000 description 20
- 230000000694 effects Effects 0.000 description 11
- 238000012545 processing Methods 0.000 description 10
- 229910052772 Samarium Inorganic materials 0.000 description 8
- 238000012986 modification Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000011573 trace mineral Substances 0.000 description 4
- 235000013619 trace mineral Nutrition 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 239000003562 lightweight material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 239000002244 precipitate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- -1 rare earth compound Chemical class 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- 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
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
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Abstract
The application relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack and a preparation method thereof, wherein the aluminum alloy comprises the following components in percentage by mass: 8.75-10.25wt.% of Si, 0.03-0.27wt.% of Mg, 0.4-0.8wt.% of Mn, 0.01-0.11wt.% of Cu, 0.08-0.27wt.% of Fe, 0.06-0.13wt.% of Ti, 0.013-0.039wt.% of Sr, 0.015-0.07wt.% of V, 0.005-0.018wt.% of Ga, 0.003-0.15wt.% of Sm; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al. The heat-treatment-free aluminum alloy can achieve higher yield strength and elongation without heat treatment, and meets the performance requirements of the integrated die-casting heat-treatment-free aluminum alloy for the battery pack of the new energy automobile.
Description
Technical Field
The application belongs to the field of aluminum alloy materials, and relates to an aluminum alloy material with high strength and high toughness without heat treatment and a preparation method thereof.
Background
In recent years, under the requirement of a dual-carbon target, the design and manufacture of parts in the new energy automobile industry are rapidly developed towards the light-weight and integrated target. The battery pack case serves as a carrying and protecting mechanism for the power battery and occupies an important position in the battery pack system. At present, the traditional battery pack box body has larger quality, and the improvement of the energy density of a battery pack system and the light weight of a new energy automobile are seriously influenced, so that the traditional battery pack box body has a large space for reducing weight and improving efficiency.
An important means for lightening the battery pack case is to apply a lightweight material, wherein the aluminum alloy material is an excellent battery pack lightweight material, and a high-vacuum die casting process is generally adopted for a long time, and a high-strength heat-treatable reinforced AlSi10MnMg material is combined to manufacture the battery pack, however, with the rapid development of energy-saving and emission-reduction automobiles, the lightweight, integration and maximization of the aluminum alloy die casting structural part put many new performance requirements on the die casting alloy, including good casting performance, flowability, no heat treatment, excellent strength and toughness requirements in an as-cast state, and the like. For example, the Silafont-36 alloy of the Rhin Germany company has good mechanical properties, but special high-vacuum die casting is needed, the requirement of improving the comprehensive mechanical properties of castings can be met through T6 heat treatment strengthening, the heat treatment of the die casting increases the consumption of process flow and cost, and the heat treatment easily deforms the castings, so that the qualification rate of finished products is not high. The C611 alloy is a non-heat treatment die casting alloy developed by aluminum company, and the material has good toughness and is suitable for the requirements of certain automobile structural parts, but the material has low Si content and low yield strength, and cannot meet the requirements of the battery pack on strength performance. A high-strength and high-toughness heat-treatment-free material (patent publication No. CN 114293058A) disclosed by Tianjin New Lizhong alloy group Co-Ltd is prepared by adding refractory Nb element, high-melting Cr element, ti element and B element, so that the overall comprehensive mechanical property of a casting is improved. A high-strength high-toughness die-casting aluminum alloy with 160MPa of yield strength, 270MPa of tensile strength and 7% of elongation can be obtained mainly by adding rare earth compound modification effect in the preparation method (patent publication No. CN 109881056A) disclosed by Shanghai Yongmaotai automobile parts.
Disclosure of Invention
The application aims to provide the heat-treatment-free aluminum alloy material for the new energy automobile battery pack, which has the characteristics of high strength and high toughness without heat treatment, solves the problems of casting deformation, bulge and the like after heat treatment of the integrated thin-wall structural member, and is easy to realize market application. In addition, research and development of novel high-strength and high-toughness die-casting aluminum alloy with higher tolerance to Fe element promote application of regenerated aluminum alloy on automobile die-casting structural parts, and the novel high-strength and high-toughness die-casting aluminum alloy is beneficial to cost control of parts and can also greatly reduce carbon emission in a raw material acquisition stage, so that the product competitiveness is remarkably improved.
The technical proposal is as follows:
the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following alloy components in percentage by mass: 8.75 to 10.25wt.% of Si, 0.03 to 0.27wt.% of Mg, 0.4 to 0.8wt.% of Mn, 0.01 to 0.11wt.% of Cu, 0.08 to 0.27wt.% of Fe, 0.06 to 0.13wt.% of Ti, 0.013 to 0.039wt.% of Sr, V:0.015-0.07wt.%, ga 0.005-0.018wt.%, sm 0.003-0.15wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200-220 ℃ and drying.
2) Smelting: heating to 740-760 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sr intermediate alloy, al-Ti intermediate alloy and Al-Sm intermediate alloy for melting, cooling to 700-720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool to prevent the Mg from burning on the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring.
3) Refining and degassing: preserving heat at 720-730 ℃, adopting rotary jetting degassing equipment, introducing nitrogen with refining agent powder into the melt for powder jetting refining, wherein the adding amount of the refining agent is 0.1-0.5%, and degassing the melt for 8-10min.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process has the die casting pressure of 350-500bar, the injection speed of 4-6m/s, the vacuum degree of 10-40mbar, the die casting temperature of 680-710 ℃ and the die temperature of 180-220 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack.
6) Sampling and testing: and (3) sampling the body of the obtained casting flat plate die, performing linear cutting to obtain test pieces with rectangular cross sections, and performing mechanical property testing by using an electronic universal tensile testing machine.
The heat treatment-free aluminum alloy obtained by adopting the components and the preparation method has the tensile strength in the die-casting state: 300-340MPa, yield strength: 145-175MPa, elongation: 10-15%.
The application has the advantages and positive effects that:
compared with the prior art, the application has the following advantages:
through experiments and production practices of a large number of die-casting aluminum alloys, the inventor finds that the mechanical properties of the alloy can be obviously optimized by adding certain trace elements into the alloy, and the action mechanism is as follows:
the alloy is added with trace element Sm, has better refining and deterioration effects on Al-Si alloy, and has fine punctiform and short rod-shaped deterioration effects on eutectic Si, and simultaneously Sm is added with a matrix to form rare earth phase Al 11 Sm 3 Becomes a substrate for alpha-Al nucleation, promotes the nucleation rate to be increased in the solidification process, and achieves the effect of grain refinement. The trace element Ga is added, and along with the increase of the content of Ga, ga can promote the precipitation of Mg at a crystal boundary, thereby promoting the strengthening phase Mg 2 The precipitation of Si can effectively improve the mechanical property of the alloy. Adding trace element V, and extractingThe tensile strength and the elongation of the high-aluminum alloy are high, and the V element precipitates a spherical AlFeSi (Mn+V) phase in the matrix, so that the flaky iron-rich phase in the matrix is effectively reduced, the improvement of the toughness of the material is facilitated, and the aim of tolerating higher Fe content is fulfilled.
The application creatively adds three elements V, ga and Sm in a certain proportion into the aluminum alloy matrix, and produces synergistic strengthening effect on the alloy. On the basis of Sr modification, sm and Sr can be added to compound modification, so that the modification effect is further enhanced, and V and Ga are added to effectively improve the toughness of the alloy, and the three elements act together to improve the comprehensive mechanical property of the alloy. In addition, the alloy provided by the application has a solid solution strengthening effect by adding a proper amount of Cu element, so that the tensile strength of the material is improved.
The alloy proportion can effectively reduce the influence degree of high iron content on the alloy performance, namely tolerates higher Fe content, thereby meeting the condition of using the recycled aluminum in the future and meeting the requirement of green low-carbon circular economy development.
The aluminum alloy has excellent performance and good die casting performance in a die casting state, and the yield strength in the die casting state is as follows: 145-175MPa, tensile strength: 300-340MPa, elongation: 10-15% (conventional commercial AlSi10MnMg alloy, die-cast tensile strength about 260MPa, yield strength about 130MPa, elongation about 4%).
In conclusion, the heat treatment-free aluminum alloy for the new energy automobile battery pack prepared by the method has the characteristics of high strength and high toughness, meets the requirement of the integrated die-casting heat treatment-free aluminum alloy for the new energy automobile battery pack, and has a very good market application prospect.
Drawings
FIG. 1 shows the microstructure morphology (200) of the alloy of the present application in the as-die cast state.
FIG. 2 shows the microstructure morphology (x 500) of the die-cast alloy of the present application (eutectic silicon in the microstructure is in the form of fine dots and short bars).
FIG. 3 is a graph showing the tensile mechanical properties at room temperature of the aluminum alloy materials prepared in example 4 and comparative example 6 according to the present application.
Detailed Description
Preferably, the heat treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 8.75 to 9.5wt.% of Si, 0.03 to 0.12wt.% of Mg, 0.4 to 0.6wt.% of Mn, 0.01 to 0.05wt.% of Cu, 0.08 to 0.12wt.% of Fe, 0.07 to 0.1wt.% of Ti, 0.013 to 0.03wt.% of Sr, V:0.015-0.03wt.%, ga 0.005-0.01wt.%, sm 0.003-0.08wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
Preferably, the heat treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 9.5 to 9.8wt.% of Si, 0.12 to 0.20wt.% of Mg, 0.4 to 0.6wt.% of Mn, 0.03 to 0.07wt.% of Cu, 0.12 to 0.18wt.% of Fe, 0.07 to 0.1wt.% of Ti, 0.02 to 0.035wt.% of Sr, V:0.03-0.05wt.%, ga 0.008-0.012wt.%, sm 0.08-0.12wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
Preferably, the heat treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 9.8 to 10.25wt.% of Si, 0.20 to 0.27wt.% of Mg, 0.4 to 0.6wt.% of Mn, 0.05 to 0.11wt.% of Cu, 0.18 to 0.27wt.% of Fe, 0.07 to 0.1wt.% of Ti, 0.028 to 0.039wt.% of Sr, V:0.05-0.07wt.%, ga 0.013-0.018wt.%, sm 0.09-0.15wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
Preferably, the heat treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 9.15wt.% Si, 0.18wt.% Mg, 0.5wt.% Mn, 0.03wt.% Cu, 0.11wt.% Fe, 0.08wt.% Ti, 0.035wt.% Sr, V:0.02wt.%, ga 0.008wt.%, sm 0.1wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
Preferably, the heat treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 9.83wt.% Si, 0.16wt.% Mg, 0.5wt.% Mn, 0.03wt.% Cu, 0.25wt.% Fe, 0.08wt.% Ti, 0.038wt.% Sr, V:0.04wt.%, ga 0.015wt.%, sm 0.15wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
The technical solution of the present application is further described in detail below with reference to the specification, the drawings and the specific embodiments, so that the advantages and features of the present application can be more easily understood by those skilled in the art, but the scope of application of the present application is not limited thereto.
Example 1:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by mass: 8.75% of Si; mn 0.6%; 0.15% of Mg; 0.03% of Cu; 0.07% of Ti; 0.08% of Fe; 0.035% of Sr; v is 0.015%; ga 0.01%; 0.003 percent of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min; the refining agent adopts a slag-removing refining covering agent produced by Zhenjiang Zhenhua flux factories, and the following is the same;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified;
5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Example 2:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by weight: 9.1% of Si; mn 0.6%; 0.15% of Mg; 0.03% of Cu; 0.07% of Ti; 0.25% of Fe; 0.035% of Sr; v is 0.015%; ga 0.01%; 0.09% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified; 5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Example 3:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by weight: 9.5% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.08% of Fe; 0.035% of Sr; v is 0.02%; ga 0.015%; 0.08% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified; 5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Example 4:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.15% of Fe; 0.035% of Sr; v is 0.02%; ga 0.015%; 0.1% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified; 5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Example 5:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.25% of Fe; 0.035% of Sr; v is 0.02%; ga 0.015%; 0.1% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified;
5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Example 6:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by weight: 10.2% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.12% of Fe; 0.035% of Sr; v is 0.02%; ga 0.005%; 0.09% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified;
5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Example 7:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by weight: 10.2% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.12% of Fe; 0.035% of Sr; v is 0.02%; ga 0.015%; 0.1% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified; 5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Example 8:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.15% of Cu; 0.07% of Ti; 0.12% of Fe; 0.035% of Sr; v is 0.02%; ga 0.015%; 0.12% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Example 9:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.25% of Cu; 0.07% of Ti; 0.12% of Fe; 0.035% of Sr; v is 0.02%; ga 0.015%; 0.1% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified; 5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Example 10:
the embodiment relates to a heat treatment-free aluminum alloy for a new energy automobile battery pack, which comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.15% of Fe; 0.035% of Sr; v0.06%; ga 0.018%; 0.15% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack comprises the following steps:
1) Material preparation and preheating: preparing materials according to the proportion of the alloy components, preheating prepared raw materials of pure aluminum, industrial silicon, pure Mg, al-Mn intermediate alloy, al-Cu intermediate alloy, al-Sr intermediate alloy, al-V intermediate alloy and Al-Ti intermediate alloy to 220 ℃ and drying the Al-Sm intermediate alloy;
2) Smelting: heating to 740 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sm intermediate alloy and Al-Ti intermediate alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing into the bottom of a crucible by a tool to prevent burning at the liquid level, and pressing Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting after the Mg is completely melted;
3) Refining and degassing: adding 0.5% refining agent into the molten aluminum, degassing the melt for 10min by using argon-introducing rotary degassing equipment, removing scum on the liquid surface, and standing for 15min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified;
5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process adopts die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 15mbar, die casting temperature of 690 ℃ and die temperature of 200 ℃. The die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: sampling the obtained casting body, processing the casting body into a test piece with a rectangular section through linear cutting, and testing mechanical properties on a universal tensile testing machine.
Comparative example 1:
the aluminum alloy prepared in comparative example 1 comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.15% of Fe; 0.035% of Sr; v is 0.02%; the impurity is equal to 0.08%, and the balance is aluminum.
The aluminum alloy of this comparative example was prepared in the same manner as in the above examples.
Comparative example 2:
the aluminum alloy prepared in comparative example 2 comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.15% of Fe; 0.035% of Sr; ga 0.015%; the impurity is equal to 0.08%, and the balance is aluminum.
The aluminum alloy of this comparative example was prepared in the same manner as in the above examples.
Comparative example 3:
the aluminum alloy prepared in comparative example 3 comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.15% of Fe; 0.035% of Sr; 0.1% of Sm; the impurity is equal to 0.08%, and the balance is aluminum.
The aluminum alloy of this comparative example was prepared in the same manner as in the above examples.
Comparative example 4:
the aluminum alloy prepared in comparative example 4 comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.15% of Fe; 0.035% of Sr; the impurity is equal to 0.08%, and the balance is aluminum.
The aluminum alloy of this comparative example was prepared in the same manner as in the above examples.
Comparative example 5:
the aluminum alloy prepared in comparative example 5 comprises the following components in percentage by weight: 9.8% of Si; mn 0.6%; 0.18% of Mg; 0.03% of Cu; 0.07% of Ti; 0.28% of Fe; 0.035% of Sr; the impurity is equal to 0.08%, and the balance is aluminum.
The aluminum alloy of this comparative example was prepared in the same manner as in the above examples.
Comparative example 6:
the aluminum alloy prepared in comparative example 6 comprises the following components in percentage by weight: 10.7% of Si; mn 0.6%; 0.33% of Mg; 0.07% of Ti; 0.22% of Fe; 0.02% of Sr; the balance being aluminum.
The aluminum alloy of this comparative example was prepared in the same manner as in the above examples.
The results of the above examples and comparative examples are shown in tables 1 and 2.
TABLE 1 (mass fraction wt%)
Table 2 (mechanical properties of die casting aluminum alloy)
Table 1 shows the mass fractions of the aluminum alloy materials of examples 1 to 10 and comparative examples 1 to 6, and Table 2 shows the mechanical properties of the die-cast aluminum alloys corresponding to Table 1. From the results of the examples and comparative examples in tables 1 and 2 above, it can be seen that: example 4 is compared with comparative examples 1, 2, 3 and 4, the overall mechanical properties of the alloy are poor when the V, ga and Sm elements are not added to the alloy at all and one of the elements is added to the alloy, and when the three elements are added to the alloy (example 4) in a certain proportion, the tensile strength is improved by about 40MPa, the yield strength is improved by about 27MPa and the elongation is improved by about 4% compared with the alloy which is not added to the alloy at all (comparative example 4), which shows that the addition of the V, ga and Sm elements has a remarkable effect on the improvement of the mechanical properties of the alloy. In addition, when the addition amount of the element is high (example 10), the improvement of the mechanical property is not obvious.
As can be seen from comparison of examples 4 and 5 with comparative examples 4 and 5, when V, ga and Sm elements are added into the alloy, the elongation of the alloy is not changed greatly along with the continuous increase of the Fe content in the alloy, the plasticity of the material is kept in a good state, and the elongation of the alloy without addition is reduced more. The above shows that the V, ga and Sm elements can weaken the deterioration degree of the alloy performance of Fe, and the aluminum alloy can tolerate higher Fe content without affecting the mechanical performance of the alloy.
As can be seen from fig. 1 and 2, the microstructure of the alloy of the application is uniform, the crystal grains are fine, eutectic Si in the alloy structure is in a fine dot shape and a short bar shape, which indicates that the alloy has obvious modification effect, and the alloy can be proved by combining the mechanical properties of table 2. According to the description, a certain proportion of V, ga and Sm elements are added into the aluminum alloy, so that the microstructure can be effectively improved, and the comprehensive mechanical property of the alloy can be improved. FIG. 3 is a graph showing the room temperature tensile mechanical properties of example 4 and comparative example 6, and comparative example 6 is a conventional commercial AlSi10MnMg alloy, and it can be seen that the mechanical properties of the alloy of the present application are more excellent.
The application adds V, ga and Sm elements in a certain proportion into an aluminum alloy matrix, and improves the mechanical property of the alloy mainly through synergistic strengthening effect. The Sm element and the Sr element produce the effects of compound modification and grain refinement, the V element and the Ga element effectively improve the toughness of the alloy, and the combined action of the three elements improves the comprehensive mechanical property of the alloy. The alloy can reduce the influence of high iron content on the alloy performance, can tolerate higher Fe content, meets the condition of producing automobile die castings by using secondary aluminum in the future, and meets the requirement of green low-carbon cyclic development.
The foregoing describes embodiments of the present application in detail, but is merely a preferred embodiment of the application and is not to be construed as limiting the scope of the application. All equivalent changes and modifications within the scope of the present application should be made within the scope of the present patent.
Claims (8)
1. The heat treatment-free aluminum alloy for the new energy automobile battery pack is characterized by comprising the following alloy components in percentage by mass: 8.75 to 10.25wt.% of Si, 0.03 to 0.27wt.% of Mg, 0.4 to 0.8wt.% of Mn, 0.01 to 0.11wt.% of Cu, 0.08 to 0.27wt.% of Fe, 0.06 to 0.13wt.% of Ti, 0.013 to 0.039wt.% of Sr, V:0.015-0.07wt.%, ga 0.005-0.018wt.%, sm 0.003-0.15wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
2. The heat-treatment-free aluminum alloy for the new energy automobile battery pack according to claim 1, wherein the heat-treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 8.75 to 9.5wt.% of Si, 0.03 to 0.12wt.% of Mg, 0.4 to 0.6wt.% of Mn, 0.01 to 0.05wt.% of Cu, 0.08 to 0.12wt.% of Fe, 0.07 to 0.1wt.% of Ti, 0.013 to 0.03wt.% of Sr, V:0.015-0.03wt.%, ga 0.005-0.01wt.%, sm 0.003-0.08wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
3. The heat-treatment-free aluminum alloy for the new energy automobile battery pack according to claim 1, wherein the heat-treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 9.5 to 9.8wt.% of Si, 0.12 to 0.20wt.% of Mg, 0.4 to 0.6wt.% of Mn, 0.03 to 0.07wt.% of Cu, 0.12 to 0.18wt.% of Fe, 0.07 to 0.1wt.% of Ti, 0.02 to 0.035wt.% of Sr, V:0.03-0.05wt.%, ga 0.008-0.012wt.%, sm 0.08-0.12wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
4. The heat-treatment-free aluminum alloy for the new energy automobile battery pack according to claim 1, wherein the heat-treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 9.8 to 10.25wt.% of Si, 0.20 to 0.27wt.% of Mg, 0.4 to 0.6wt.% of Mn, 0.05 to 0.11wt.% of Cu, 0.18 to 0.27wt.% of Fe, 0.07 to 0.1wt.% of Ti, 0.028 to 0.039wt.% of Sr, V:0.05-0.07wt.%, ga 0.013-0.018wt.%, sm 0.09-0.15wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
5. The heat-treatment-free aluminum alloy for the new energy automobile battery pack according to claim 1, wherein the heat-treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 9.15wt.% Si, 0.18wt.% Mg, 0.5wt.% Mn, 0.03wt.% Cu, 0.11wt.% Fe, 0.08wt.% Ti, 0.035wt.% Sr, V:0.02wt.%, ga 0.008wt.%, sm 0.1wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
6. The heat-treatment-free aluminum alloy for the new energy automobile battery pack according to claim 1, wherein the heat-treatment-free aluminum alloy comprises the following alloy components in percentage by mass: 9.83wt.% Si, 0.16wt.% Mg, 0.5wt.% Mn, 0.03wt.% Cu, 0.25wt.% Fe, 0.08wt.% Ti, 0.038wt.% Sr, V:0.04wt.%, ga 0.015wt.%, sm 0.15wt.%; the total amount of other impurities is less than or equal to 0.2wt.%, and the balance is Al.
7. The preparation method of the heat treatment-free aluminum alloy for the new energy automobile battery pack is characterized by comprising the following steps of:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200-220 ℃ and drying;
2) Smelting: heating to 740-760 ℃, firstly melting pure aluminum and industrial silicon, respectively adding Al-Cu intermediate alloy, al-Mn intermediate alloy, al-V intermediate alloy, al-Sr intermediate alloy, al-Ti intermediate alloy and Al-Sm intermediate alloy for melting, cooling to 700-720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool to prevent the Mg from burning on the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring;
3) Refining and degassing: preserving heat at 720-730 ℃, adopting rotary jetting degassing equipment, introducing nitrogen with refining agent powder into the melt for powder jetting refining, wherein the adding amount of the refining agent is 0.1-0.5%, and degassing the melt for 8-10min;
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into an ingot after the components are qualified;
5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, wherein the die casting process in the die casting process has the die casting pressure of 350-500bar, the injection speed of 4-6m/s, the vacuum degree of 10-40mbar, the die casting temperature of 680-710 ℃ and the die temperature of 180-220 ℃; the die used for die casting is a flat die close to the thickness of an actual battery pack;
6) Sampling and testing: and (3) sampling the body of the obtained casting flat plate die, performing linear cutting to obtain test pieces with rectangular cross sections, and performing mechanical property testing by using an electronic universal tensile testing machine.
8. The method for preparing the heat-treatment-free aluminum alloy for the new energy automobile battery pack, as claimed in claim 7, is characterized in that the heat-treatment-free aluminum alloy prepared by the preparation method has the tensile strength in a die-casting state: 300-340MPa, yield strength: 145-175MPa, elongation: 10-15%.
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| CN117187628A (en) * | 2023-09-13 | 2023-12-08 | 山西瑞格金属新材料有限公司 | Brazing heat treatment-free aluminum alloy for die casting and preparation method thereof |
| CN117568671A (en) * | 2023-08-21 | 2024-02-20 | 小米汽车科技有限公司 | Die-casting aluminum alloy material free of heat treatment, preparation method thereof and automobile structural member |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117568671A (en) * | 2023-08-21 | 2024-02-20 | 小米汽车科技有限公司 | Die-casting aluminum alloy material free of heat treatment, preparation method thereof and automobile structural member |
| CN117187628A (en) * | 2023-09-13 | 2023-12-08 | 山西瑞格金属新材料有限公司 | Brazing heat treatment-free aluminum alloy for die casting and preparation method thereof |
| CN117187628B (en) * | 2023-09-13 | 2024-06-04 | 山西瑞格金属新材料有限公司 | Brazing heat treatment-free aluminum alloy for die casting and preparation method thereof |
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Inventor after: Lin Maogu Inventor after: Yan Guoqing Inventor after: Cao Chang Inventor after: Zhang Xu Inventor before: Lin Maogu Inventor before: Yan Guoqing Inventor before: Cao Chang Inventor before: Zhang Xu Inventor before: Zhai Kai |