CN112553508A - Aluminum alloy, preparation method thereof and aluminum alloy structural part - Google Patents

Aluminum alloy, preparation method thereof and aluminum alloy structural part Download PDF

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Publication number
CN112553508A
CN112553508A CN201910851031.0A CN201910851031A CN112553508A CN 112553508 A CN112553508 A CN 112553508A CN 201910851031 A CN201910851031 A CN 201910851031A CN 112553508 A CN112553508 A CN 112553508A
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aluminum alloy
aluminum
raw
alloy
liquid
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霍皓皓
文丹华
郭强
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BYD Co Ltd
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BYD Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent

Abstract

The invention provides an aluminum alloy, a preparation method thereof and an aluminum alloy structural member, wherein the aluminum alloy comprises the following components in percentage by mass based on the total mass of the aluminum alloy: 7-10% of Si; 4.7-6.0% of Cu; 0.3-0.5% Mg; 0.4-0.5% Ti; 0-0.3% Fe; 0-0.03% of Sr; and 82.4-87.6% of Al. The aluminum alloy has good strength, toughness and die-casting performance, can meet the use requirements of structural members with higher requirements on strength and toughness, such as electronic equipment, and the like, and can be widely applied to structural members with small inner size and thin thickness, such as mobile phones, tablet computers, and the like.

Description

Aluminum alloy, preparation method thereof and aluminum alloy structural part
Technical Field
The invention relates to the technical field of materials, in particular to an aluminum alloy, a preparation method thereof and an aluminum alloy structural member.
Background
Along with the popularization of the application of the aluminum alloy, the application of the aluminum alloy is more and more extensive. Aluminum alloy is generally applied to traditional manufacturing industries of automobiles, airplanes and the like, and now along with the maturity of die-casting technology, more and more electronic products begin to use aluminum alloy as internal structural parts, so that higher requirements on the performance of the aluminum alloy are met. Because the electronic products have relatively small sizes and thinner thicknesses, the materials of the electronic products not only require high strength, but also have higher requirements on the elongation of the materials. But at present, the aluminum alloy material with high strength and high elongation can simultaneously have the yield index.
Thus, the current aluminum alloy-related technology still needs to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide an aluminum alloy having high strength, high toughness, and die-casting properties.
In one aspect of the invention, an aluminum alloy is provided. According to an embodiment of the present invention, the aluminum alloy includes, in mass percent, based on the total mass of the aluminum alloy: 7-10% of Si; 4.7-6.0% of Cu; 0.3-0.5% Mg; 0.4-0.5% Ti; 0-0.3% Fe; 0-0.03% of Sr; and 82.7-87.6% of Al. The aluminum alloy has good strength, toughness and die-casting performance, can meet the use requirements of structural members with higher requirements on strength and toughness, such as electronic equipment, and the like, and can be widely applied to structural members with small inner size and thin thickness, such as mobile phones, tablet computers, and the like.
In another aspect of the invention, the invention provides a method of making the foregoing aluminum alloy. According to an embodiment of the invention, the method comprises: heating and melting aluminum, a silicon-containing raw material, a copper-containing raw material, an iron-containing raw material, a strontium-containing raw material, a titanium-containing raw material and a magnesium-containing raw material to obtain an aluminum alloy liquid; and refining and casting the aluminum alloy liquid in sequence to obtain the aluminum alloy. The method is simple and convenient to operate and easy to implement industrially, and the obtained aluminum alloy has high toughness and good mechanical property and die-casting property.
In another aspect of the invention, the invention provides an aluminum alloy structural member. According to an embodiment of the invention, at least a part of the aluminium alloy structural part is formed using the aluminium alloy described above. The aluminum alloy structural member has all the features and advantages of the aluminum alloy described above, and thus, the description thereof is omitted.
Detailed Description
The following describes embodiments of the present invention in detail. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
In one aspect of the invention, an aluminum alloy is provided. According to an embodiment of the present invention, the aluminum alloy includes, in mass percent, based on the total mass of the aluminum alloy: 7-10% of Si; 4.7-6.0% of Cu; 0.3-0.5% Mg; 0.4-0.5% Ti; 0-0.3% Fe; 0-0.03% of Sr; and 82.7-87.6% of Al.
Specifically, the specific content of Si in the aluminum alloy can be 8%, 9% and the like, the Si is used as a main mechanical strengthening element and can be dissolved in Al to form an alpha-Al solid solution and an Al-Si eutectic or hypoeutectic phase, the mechanical property of the aluminum alloy is improved, the die-casting fluidity is ensured, and the yield of batch production is considered. Si in the content range can ensure that the aluminum alloy has better mechanical property and die-casting property at the same time.
Specifically, the specific content of Cu in the aluminum alloy may be 5%, 5.5%, or the like. Cu may form Al with Al2Cu acts as a strengthening phase in the aluminum alloy. Within a certain range, the strength of the aluminum alloy is continuously improved along with the improvement of the content of Cu, and the Cu is within the content range, so that the requirements of high strength and high toughness of the aluminum alloy can be met; if the Cu content is too high, the elongation of the material is greatly reduced, and if the Cu content is too low, the strength of the material is too low to meet the requirement of high strength.
Specifically, the specific content of Mg in the aluminum alloy may be 0.3%, 0.4%, 0.5%, or the like. Mg and Si can form Mg2The Si strengthening phase has obvious strengthening effect, and the strength of the aluminum alloy can be obviously improved by adding a small amount of the Si strengthening phase. However, when the Mg content is too high, the toughness and plasticity of the aluminum alloy are lowered. The inventor finds that the content of Mg in the range can enable the aluminum alloy to have excellent mechanical property and keep higher toughness at the same time after experimental verification. If the content of Mg is too high, the elongation of the material is greatly reduced, Mg is easily oxidized, and the melting cost is increased, and if the content of Mg is too highLow, the purpose of improving the strength of the material can not be achieved, and the requirement of high strength can not be met.
Specifically, the specific content of Ti in the aluminum alloy may be 0.4%, 0.45%, 0.5%, or the like. Compared with the aluminum alloy in the related technology, the content of Ti element in the aluminum alloy is increased, 0.4-0.5% of Ti is added, the alloy can be strengthened, the result of increasing the strength without reducing the elongation is achieved, and other excellent properties of the original material are maintained. If the Ti content is too high, the elongation of the material is lowered, and the toughness of the material is lowered, and if the Ti content is too low, the strength of the material is lowered, and the requirement for high strength cannot be satisfied.
Specifically, the aluminum alloy may contain Fe or not, and the specific content of Fe in the aluminum alloy may be 0%, 0.1%, 0.2%, 0.3%, or the like. Fe is an impurity element for die-casting aluminum alloy, and iron mostly exists in the form of long-needle intermetallic compounds, so that the mechanical property of the alloy is reduced. The influence of Fe on the mechanical property is relatively small in the content range, and the smelting difficulty is reduced because various intermediate alloys contain impurity iron elements. If the Fe content is too high, it may result in a decrease in strength and elongation of the material, especially a rapid decrease in elongation.
Specifically, the aluminum alloy of the present invention may contain Sr or may not contain Sr. The specific content of Sr in the aluminum alloy may be 0%, 0.01%, 0.02%, 0.03%, or the like. Sr element can refine crystal grains and has the function of fine-grain strengthening on aluminum alloy. If the Sr content is too high, the strength and the elongation of the material are reduced, and because the Al-Sr alloy has higher cost, the material waste is caused, the material price is increased, and other defects are caused.
Specifically, the specific content of aluminum in the aluminum alloy of the present invention may be 82.7%, 84%, 86%, 87.6%, and the like.
It will be appreciated by those skilled in the art that in the case of aluminum alloys, there is a negative correlation between the different properties, strength and toughness, i.e., the higher the strength of the possible aluminum alloy, the lower the toughness. The aluminum alloy provided by the invention can improve the strength of the aluminum alloy, ensure that the material has higher toughness and die-casting performance, can meet the use requirements of structural members with high toughness and strength requirements, and is suitable for manufacturing the structural members of electronic equipment with small size and thin thickness.
According to an embodiment of the present invention, the aluminum alloy includes, in mass percent, based on the total mass of the aluminum alloy: 8.5-9.5% of Si; 5-5.5% of Cu; 0.3-0.5% Mg; 0.4-0.5% Ti; 0-0.2% Fe; 0.02-0.03% of Sr; and 83.77-85.78% Al. Within this range, the toughness, strength and die-casting property of the aluminum alloy are relatively better.
According to an embodiment of the present invention, the total content of impurity elements in the aluminum alloy is less than 0.1% in mass percentage based on the total mass of the aluminum alloy. Specifically, since the purity of the raw material is hardly 100%, and since impurities are likely to be introduced during the production process, the aluminum alloy generally contains inevitable impurities (such as Zn, Mn, Ni, Cr, etc.), and in the present invention, the total content of impurity elements may be specifically 0.09%, 0.08%, 0.07%, 0.06%, 0.05%, 0.04%, 0.03%, 0.02%, 0.01%, etc. Therefore, various performances of the aluminum alloy can be well ensured to meet the requirements, and negative effects on the aluminum alloy can not be generated.
According to an embodiment of the present invention, the aluminum alloy is composed of, in mass percent, based on the total mass of the aluminum alloy: 7-10% of Si; 4.7-6.0% of Cu; 0.3-0.5% Mg; 0.4-0.5% Ti; 0-0.3% Fe; 0-0.03% of Sr; and the balance of Al. The aluminum alloy with the components and the proportion has good toughness, strength and die casting performance, can meet the requirements of high strength and high toughness, and is suitable for manufacturing structural members of electronic equipment.
According to an embodiment of the present invention, the aluminum alloy is composed of, in mass percent, based on the total mass of the aluminum alloy: : 8.5-9.5% of Si; 5-5.5% of Cu; 0.3-0.5% Mg; 0.4-0.5% Ti; 0-0.2% Fe; 0.02-0.03% of Sr; and the balance of Al. The aluminum alloy with the components and the proportion has relatively better toughness, strength and die casting performance, and is more suitable for preparing electronic equipment structural parts and the like.
According to an embodiment of the invention, the aluminum alloy satisfies at least one of the following conditions: the yield strength is greater than or equal to 220MPa, specifically 220-250 MPa (such as 220MPa, 230MPa, 240MPa, 250MPa and the like), the tensile strength is greater than or equal to 370MPa, specifically 380-420 MPa (such as 380MPa, 390MPa, 400MPa, 410MPa, 420MPa and the like), the elongation is greater than or equal to 3%, specifically 3.5-6% (such as 3.5%, 4%, 5%, 6.0% and the like); the fluidity is greater than or equal to 1000mm, and specifically may be 1000 to 1200mm (specifically, 1000mm, 1100mm, 1200mm, etc.). Specifically, the aluminum alloy satisfies any one of the above conditions, any two of the above conditions, any three of the above conditions, or all four of the above conditions. Therefore, the aluminum alloy has good strength, toughness and die casting performance, can meet the development requirements of high strength and high toughness, and is used for manufacturing electronic equipment structural members and the like.
In another aspect of the invention, the invention provides a method of making the foregoing aluminum alloy. According to an embodiment of the invention, the method comprises: heating and melting aluminum, a silicon-containing raw material, a copper-containing raw material, an iron-containing raw material, a strontium-containing raw material, a titanium-containing raw material and a magnesium-containing raw material to obtain an aluminum alloy liquid; and refining and casting the aluminum alloy liquid in sequence to obtain the aluminum alloy. The method is simple and convenient to operate and easy to implement industrially, and the obtained aluminum alloy has high toughness and high strength and die casting performance.
According to an embodiment of the present invention, the method may specifically include: heating and melting aluminum, adding the silicon-containing raw material, and heating and melting to obtain a first aluminum alloy liquid; adding the copper-containing raw material, the iron-containing raw material, the strontium-containing raw material and the titanium-containing raw material into the first aluminum alloy liquid, and heating and melting to obtain a second aluminum alloy liquid; adding a magnesium-containing raw material into the second aluminum alloy liquid, heating to melt, and then carrying out deslagging treatment to obtain a third aluminum alloy liquid; and refining and casting the third aluminum alloy liquid in sequence to obtain the aluminum alloy.
According to an embodiment of the present invention, the supply form of each raw material is not particularly limited, and may be flexibly selected according to actual needs, for example, aluminum may be supplied in the form of an aluminum ingot, and a silicon-containing raw material, a copper-containing raw material, an iron-containing raw material, a strontium-containing raw material, a titanium-containing raw material, and a magnesium-containing raw material may be supplied in the form of a simple substance or an intermediate alloy. In some embodiments of the invention, the method may comprise: heating and melting an aluminum ingot, adding the silicon-aluminum intermediate alloy, and heating and melting to obtain a first aluminum alloy liquid; adding an aluminum-copper intermediate alloy, an aluminum-iron intermediate alloy, an aluminum-strontium intermediate alloy and an aluminum-titanium intermediate alloy into the first aluminum alloy liquid, and heating and melting to obtain a second aluminum alloy liquid; adding a magnesium simple substance into the second aluminum alloy liquid, heating and melting, and then carrying out deslagging treatment to obtain a third aluminum alloy liquid; and refining and casting the third aluminum alloy liquid in sequence to obtain the aluminum alloy. The method is simple and convenient to operate and easy to implement industrially, and the obtained aluminum alloy has high toughness and good mechanical property and die-casting property.
Specifically, the method may include the steps of: preheating a smelting furnace at the temperature of 400-; reducing the furnace temperature to 760-770 ℃, adding the silicon-aluminum intermediate alloy into the aluminum melt, and continuing stirring for 15-16 minutes after the silicon-aluminum intermediate alloy is melted to obtain the first aluminum alloy liquid; reducing the furnace temperature to 700-710 ℃, and adding an aluminum-copper intermediate alloy, an aluminum-iron intermediate alloy, an aluminum-strontium intermediate alloy and an aluminum-titanium intermediate alloy into the first aluminum alloy liquid to obtain a second aluminum alloy liquid; adding the pure magnesium into the second aluminum alloy liquid, continuing stirring for 8-9 minutes after the pure magnesium is completely melted, and removing scum to obtain a third aluminum alloy liquid; and adding a refining agent into the third aluminum alloy liquid at the temperature of 700 ℃ and 710 ℃ for refining and stirring for 15-16 minutes, then performing casting, and obtaining the required aluminum alloy structural part product by a conventional die casting mode.
According to the embodiment of the invention, after refining and before casting, the aluminium alloy can be subjected to stokehold component analysis to check the component content of the alloy, the alloy liquid with qualified component content can be directly cast, and the alloy liquid with unqualified component content can be fed (when the component content is less) or diluted (when the component content is more) to reach the qualified range, and then casting is carried out.
According to an embodiment of the present invention, the method of preparing an aluminum alloy may further include subjecting the cast aluminum alloy ingot to natural aging. Therefore, the internal stress of the aluminum alloy ingot can be effectively eliminated, the structure and the size are stabilized, and the mechanical property is improved. Specifically, the time of the natural aging treatment may be 10 to 15 days.
In another aspect of the invention, the invention provides an aluminum alloy structural member. According to an embodiment of the invention, at least a part of the aluminium alloy structural part is formed using the aluminium alloy described above. The aluminum alloy structural part has good strength and ideal toughness, can be molded by a simple die-casting process, has good use effect and low preparation cost, and still has better use effect even when the aluminum alloy structural part has thinner thickness and/or smaller size.
According to an embodiment of the invention, the aluminum alloy structural member comprises an electronic device structural member. Therefore, the structural member has good mechanical strength and plasticity, can well meet the requirements of users on high strength and high toughness of products, and improves the user experience.
The following describes embodiments of the present invention in detail.
Example 1
The formula is as follows: based on 100 parts by weight of the aluminum alloy, the aluminum alloy contains 7.0 parts by weight of Si, 5.0 parts by weight of Cu, 0.3 parts by weight of Mg, 0.4 parts by weight of Ti, 0.1 parts by weight of Fe, 0.02 parts by weight of Sr and the balance of Al.
The preparation method comprises the following steps: firstly, preheating a smelting furnace at 400 ℃ for 25 minutes, purging with argon, and adding corresponding parts by weight of pure aluminum ingots for melting; when the temperature of the pure aluminum liquid reaches 800 ℃, standing for 25 minutes at constant temperature to ensure that the pure aluminum liquid is fully melted; reducing the furnace temperature to 760 ℃, adding corresponding amount of aluminum-silicon alloy, standing for 25 minutes at constant temperature, and continuing stirring for 15 minutes after the aluminum-silicon alloy is melted; cooling the smelting furnace to 700 ℃, adding the rest intermediate alloys (aluminum-copper intermediate alloy, aluminum-iron intermediate alloy, aluminum-strontium intermediate alloy and aluminum-titanium intermediate alloy), completely melting, and standing; finally, adding 0.3 weight part of pure magnesium, stirring for 8 minutes after complete melting, removing floating slag, adding a refining agent at 700 ℃ for refining, and stirring for 15 minutes; and then, performing stokehole component analysis, checking the component content of the alloy, and casting after the melt with unqualified component content reaches the qualified range in a material supplementing or diluting mode to obtain the aluminum alloy ingot.
Example 2-example 17
The formula is as follows: the specific formulation is detailed in table 1.
The preparation method comprises the following steps: the same as in example 1.
Comparative examples 1 to 12
The formula is as follows: the specific formulation is detailed in table 1.
The preparation method comprises the following steps: the same as in example 1.
TABLE 1 (unit wt%)
And (3) performance testing:
1. the standard tensile test specimens obtained after die casting the aluminum alloys in examples 1 to 17 of the present invention and comparative examples 1 to 12 were subjected to the first part of the tensile test of metallic materials of GB/T228.1-2010: room temperature test method for tensile strength, yield strength and elongation of aluminum alloy. The specific test results are shown in table 2.
2. Spiral line measurement of fluidity of heat-conducting aluminum alloy material: the aluminum alloys of examples 1-17 and comparative examples 1-12 were melted at 730 ℃ and after being completely melted, discharged from the furnace and air-cooled to 690 ℃, and the fluid specimens were cast and the length of the helical aluminum alloy pattern was measured. The specific results are shown in Table 2.
3. And (3) testing the content of impurities:
the contents of the components in the aluminum alloys obtained in examples 1 to 17 were measured by laser direct-reading spectroscopy, and the total content of impurities in all the aluminum alloys was 0.1% or less.
TABLE 2
From the data in the table above, it can be seen that the mechanical properties (yield strength and tensile strength), elongation and die-casting property (fluidity) of the aluminum alloy of the present invention are all high, and according to comparative examples 1-12, if the content of each component is not within the protection range of the present application, the mechanical properties (yield strength and tensile strength), elongation and fluidity of the aluminum alloy cannot be considered at the same time, or none of the above properties are good, or one or two of the above properties are good, and the other properties are not good, so that the mechanical properties (yield strength and tensile strength), elongation and fluidity cannot be well balanced. In conclusion, the aluminum alloy disclosed by the invention has the advantages that through the adjustment of the components and the proportion, the components are matched and cooperate with each other, so that the aluminum alloy has better mechanical property, elongation and fluidity, can well meet the use requirements of high strength and high toughness (elongation), and is suitable for preparing the structural member of the electronic equipment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. An aluminum alloy, characterized in that the aluminum alloy comprises, in mass percent based on the total mass of the aluminum alloy:
7-10% of Si;
4.7-6.0% of Cu;
0.3-0.5% Mg;
0.4-0.5% Ti;
0-0.3% Fe;
0-0.03% of Sr; and
82.7-87.6% of Al.
2. The aluminum alloy of claim 1, wherein the aluminum alloy comprises, in mass percent based on the total mass of the aluminum alloy:
8.5-9.5% of Si;
5-5.5% of Cu;
0.3-0.5% Mg;
0.4-0.5% Ti;
0-0.2% Fe;
0.02-0.03% of Sr; and
83.77-85.78% of Al.
3. The aluminum alloy of claim 1, wherein the total content of impurity elements in the aluminum alloy is less than 0.1% in mass percent, based on the total mass of the aluminum alloy.
4. The aluminum alloy of any one of claims 1-3, wherein at least one of the following conditions is satisfied:
the yield strength is greater than or equal to 220MPa, preferably 220-250 MPa;
the tensile strength is more than or equal to 370MPa, preferably 380-420 MPa;
the elongation is more than or equal to 3 percent, and preferably is 3.5 to 6 percent;
the fluidity is greater than or equal to 1000mm, preferably 1000-1200 mm.
5. A method of making the aluminum alloy of any of claims 1-4, comprising:
heating and melting aluminum, a silicon-containing raw material, a copper-containing raw material, an iron-containing raw material, a strontium-containing raw material, a titanium-containing raw material and a magnesium-containing raw material to obtain an aluminum alloy liquid;
and refining and casting the aluminum alloy liquid in sequence to obtain the aluminum alloy.
6. The method of claim 5, comprising:
heating and melting aluminum, adding the silicon-containing raw material, and heating and melting to obtain a first aluminum alloy liquid;
adding the copper-containing raw material, the iron-containing raw material, the strontium-containing raw material and the titanium-containing raw material into the first aluminum alloy liquid, and heating and melting to obtain a second aluminum alloy liquid;
adding a magnesium-containing raw material into the second aluminum alloy liquid, heating to melt, and then carrying out deslagging treatment to obtain a third aluminum alloy liquid;
and refining and casting the third aluminum alloy liquid in sequence to obtain the aluminum alloy.
7. The method of claim 6, comprising:
preheating a smelting furnace at the temperature of 400-;
reducing the furnace temperature to 760-770 ℃, adding the silicon-aluminum intermediate alloy into the aluminum melt, and continuing stirring for 15-16 minutes after the silicon-aluminum intermediate alloy is melted to obtain the first aluminum alloy liquid;
reducing the furnace temperature to 700-710 ℃, and adding an aluminum-copper intermediate alloy, an aluminum-iron intermediate alloy, an aluminum-strontium intermediate alloy and an aluminum-titanium intermediate alloy into the first aluminum alloy liquid to obtain a second aluminum alloy liquid;
adding the magnesium-containing raw material into the second aluminum alloy liquid, continuing stirring for 8-9 minutes after the magnesium-containing raw material is completely melted, and removing floating slag to obtain a third aluminum alloy liquid;
adding a refining agent to the third aluminum alloy liquid at the temperature of 700 ℃ and 710 ℃ for refining and stirring for 15-16 minutes, and then carrying out the casting.
8. The method according to any one of claims 5-7, further comprising:
and carrying out natural aging treatment on the aluminum alloy ingot obtained by casting.
9. An aluminum alloy structural member, characterized in that at least a part of the aluminum alloy structural member is constituted by the aluminum alloy according to any one of claims 1 to 4.
10. The aluminum alloy structural member of claim 9, wherein the aluminum alloy structural member comprises an electronic device structural member.
CN201910851031.0A 2019-09-10 2019-09-10 Aluminum alloy, preparation method thereof and aluminum alloy structural part Pending CN112553508A (en)

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JP2000212672A (en) * 1999-01-22 2000-08-02 Toyota Motor Corp Production of aluminum base casting having high strength and low residual strain
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US20110126947A1 (en) * 2008-07-30 2011-06-02 Rio Tinto Alcan International Limited Casting made from aluminium alloy, having high hot creep and fatigue resistance
CN102808118A (en) * 2012-07-16 2012-12-05 芜湖永裕汽车工业有限公司 High-performance cast aluminum alloy for cylinder cover
CN104878258A (en) * 2015-05-20 2015-09-02 柳州市百田机械有限公司 Preparation method of high-strength die casting aluminium alloy

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000212672A (en) * 1999-01-22 2000-08-02 Toyota Motor Corp Production of aluminum base casting having high strength and low residual strain
US20050199318A1 (en) * 2003-06-24 2005-09-15 Doty Herbert W. Castable aluminum alloy
CN1607261A (en) * 2003-10-13 2005-04-20 合金材料实验室 Die-casting aluminium alloy
CN1924335A (en) * 2005-09-01 2007-03-07 通用汽车环球科技运作公司 Pull-proof cylinder aluminium piston and aluminium cylinder hole association and method for making same
US20110126947A1 (en) * 2008-07-30 2011-06-02 Rio Tinto Alcan International Limited Casting made from aluminium alloy, having high hot creep and fatigue resistance
CN102808118A (en) * 2012-07-16 2012-12-05 芜湖永裕汽车工业有限公司 High-performance cast aluminum alloy for cylinder cover
CN104878258A (en) * 2015-05-20 2015-09-02 柳州市百田机械有限公司 Preparation method of high-strength die casting aluminium alloy

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