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High-performance low-carbon aluminum alloy and preparation method

A carbon-aluminum alloy, high-performance technology, applied in the field of aluminum alloy materials, can solve problems such as unfavorable cost control, rare earth-rich phase precipitation restricting performance improvement, etc.

Active Publication Date: 2022-03-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It adds 1 to 2% Re elements to the aluminum-silicon alloy to obtain higher toughness, but this technology adds a large amount of rare earth elements, and the precipitation of the rich rare earth phase restricts the performance improvement, and is not conducive to cost control

Method used

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  • High-performance low-carbon aluminum alloy and preparation method

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preparation example Construction

[0045] The second aspect provides a method for preparing the high-performance low-carbon aluminum alloy described in the first aspect, comprising:

[0046] S1: Proportion raw materials according to the required chemical composition, the raw materials are pure aluminum and other raw material master alloys;

[0047] S2: Preheating the raw materials;

[0048] S3: Melting and refining the preheated raw materials, pouring and cooling after all the raw materials are melted, to obtain aluminum alloy castings;

[0049] S4: The aluminum alloy casting is subjected to solution heat treatment, using a two-stage solution process: the temperature of the first solution treatment is 400-450°C, the time of the first solution treatment is 4-10h, and the temperature of the second solution solution is 500°C. ~510℃, the secondary solid solution treatment time is 8~20h;

[0050] S5: performing water quenching and artificial aging on the aluminum alloy casting after the solution heat treatment to ...

Embodiment 1

[0070] A high-performance low-carbon aluminum alloy, its chemical composition is calculated by mass percentage: Si 7.23%, Cu 3.38%, Mg 0.26%, Fe 0.39%, Mn 0.38%, Ti 0.02%, La 0.07%, the rest is Al and unavoidable impurities.

[0071] The preparation method of above-mentioned alloy, according to the following steps:

[0072] S1. Raw material selection: Proportion according to the above-mentioned high-performance low-carbon aluminum alloy composition, and the raw material is an intermediate alloy of pure aluminum and other raw materials;

[0073] S2. Pretreatment: All raw materials are subjected to surface grinding and polishing and ultrasonic vibration pretreatment to remove the influence of oxides and impurities; Use after drying;

[0074] S3. Smelting: add pure aluminum, aluminum-silicon, aluminum-iron, aluminum-manganese, and aluminum-copper intermediate alloys in the raw materials preheated in step S2 into the furnace in sequence, and the temperature in the furnace is rai...

Embodiment 2

[0083] A high-performance low-carbon aluminum alloy, its chemical composition is calculated by mass percentage, Si: 7.29%, Cu: 3.49%, Mg: 0.28%, Fe: 0.38%, Mn: 0.37%, Ti: 0.02%, La: 0.11 %, the rest is aluminum and unavoidable impurities. The preparation method of the alloy is carried out according to the process steps of Example 1.

[0084] According to the method of embodiment 1, the obtained aluminum alloy is sampled, processed and tested, and the light microscope photo after the corrosion treatment, the photomicrograph after the eutectic silicon has deteriorated, and the SEM electron microscope image after the heat treatment are respectively as follows figure 1 , figure 2 , image 3 Figure (b) in. The results show that the average secondary dendrite arm spacing in Example 2 is 13.42 μm, the average equivalent diameter of eutectic silicon is 3.63 μm, and the average circularity is 0.47.

[0085] According to the method of Example 1, the mechanical properties of the obt...

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Abstract

The invention provides a high-performance low-carbon aluminum alloy and a preparation method, and belongs to the technical field of aluminum alloy materials. The aluminum alloy comprises the following chemical components in percentage by mass: 6%-8% of Si, 3%-5% of Cu, 0.2%-0.6% of Mg, less than or equal to 0.8% of Fe, 0.3%-0.6% of Mn, 0.02%-0.04% of Ti, 0.05%-0.15% of La and the balance of Al and inevitable impurities. Through component optimization and process parameter adjustment, the yield strength of a casting reaches 400 MPa or above, the tensile strength reaches 430 MPa or above, the hardness reaches 155 HV or above, and the ductility reaches 4.0% or above. The method serves the major strategy of carbon peak reaching and carbon neutralization in China, the manufacturing process is free of pollution, the carbon emission is only 5% of that of a high-performance aluminum alloy structural part produced by electrolytic aluminum, and the bottleneck problem that regenerated aluminum alloy cannot be applied to high-end products is thoroughly solved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy materials, in particular to a high-performance low-carbon aluminum alloy and a preparation method. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, good corrosion resistance and recyclability. It is widely used in automobiles, aerospace and other fields. However, the high energy consumption and carbon emissions of the aluminum electrolysis process restrict the further development of the industry. In response to my country's major national strategy of "carbon peaking and carbon neutrality" and the core technical problems of "low-carbon aluminum", the recycled casting aluminum alloy technology reduces carbon emissions by more than 95%, which has good application value and development prospects. [0003] Aluminum-silicon alloys have become the most important casting aluminum alloys due to their good casting performance, small shrinkage cav...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/03C22F1/043
CPCC22C21/04C22C1/026C22C1/03C22F1/043C22F1/002
Inventor 王俊升刘鑫秀王兵杨兴海田光元李全
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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