Aluminum-silicon alloy high-pressure heat treatment method and obtained product

A heat treatment method, aluminum-silicon alloy technology, applied in the field of metal materials, can solve problems such as coarse silicon phase, and achieve the effects of alleviating stress concentration, excellent plasticity, and uniform distribution

Inactive Publication Date: 2019-01-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of coarse silicon phase in the existing aluminum-silicon alloy, the present invention proposes a high-pressure heat treatment method based on T6 heat treatment

Method used

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  • Aluminum-silicon alloy high-pressure heat treatment method and obtained product
  • Aluminum-silicon alloy high-pressure heat treatment method and obtained product
  • Aluminum-silicon alloy high-pressure heat treatment method and obtained product

Examples

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Effect test

Embodiment 1

[0049] Adopt the method provided by the invention to prepare Al-7wt%Si alloy, concrete processing step is as follows:

[0050] Step 1: alloy melting;

[0051] Put industrial pure aluminum (99.7wt%) and industrial grade metal silicon (99.5wt%) into DD-25 high-frequency induction melting furnace, heat to 750°C to melt pure aluminum and metal silicon. After the raw materials are completely melted, they are kept at 750°C for 10 minutes, so that the silicon, magnesium, and copper elements can be completely diffused and dissolved to ensure a uniform melt.

[0052] Then blow high-purity argon with a graphite venting rod and add C2 Cl 6 Degassing and refining are carried out with the method, the gas flow rate is 0.8L / min, and the degassing time is 30min. After the melt is processed, let it stand for 10 minutes, wait for the temperature of the melt to drop to 720°C, and pour it into the L-shaped horizontal iron mold of the traditional casting stretching rod, and the cooling rate is a...

Embodiment 2

[0063] The product composition is the same as in Example 1, and the main difference with Example 1 is that the aging treatment time is 1h.

[0064] The aluminum-silicon alloy prepared by the method is subjected to a mechanical tensile test at room temperature, and the yield strength is 259MPa, the tensile strength is 330MPa, and the elongation at break is 30%.

Embodiment 3

[0066] The product composition is the same as in Example 1, and the main difference with Example 1 is that the aging treatment time is 10h.

[0067] The aluminum-silicon alloy prepared by the method of the invention is subjected to a mechanical tensile test at room temperature, and the yield strength is 277MPa, the tensile strength is 330MPa, and the elongation at break is 23%. The room temperature tensile curve of the alloy prepared in embodiment 1-3 is as figure 2 As shown, the elongation at break of the obtained alloys is above 20%. Alloys with different yield strength and uniform elongation can be obtained by changing the aging parameters reasonably. From the perspective of the engineering strain performance of the alloy, the aging treatment time of the alloy only added with silicon is preferably in the range of 0.1 to 1 h, and too long aging treatment time will not bring greater strain capacity.

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Abstract

The invention provides an aluminum-silicon alloy high-pressure heat treatment method. The aluminum-silicon alloy high-pressure heat treatment method comprises the steps of 1, alloy smelting, wherein after aluminum and other raw materials are molten in a smelting furnace at high temperature, casting is carried out, and the other raw materials comprise one or more of silicon, magnesium and copper; 2, high-pressure solid solution treatment, wherein the pressure of 1-10 GPa and the temperature of 600 DEG C to 750 DEG C are exerted to a casting, and quasi-hydrostatic pressure heat treatment is carried out; and 3, aging treatment, wherein aging treatment is carried out for 0.1 h to 10 h at the temperature of 150 DEG C to 200 DEG C. The invention further provides a product obtained through the aluminum-silicon alloy high-pressure heat treatment method. Silicon in an aluminum-silicon alloy obtained through the heat treatment method is evenly dispersed nano-particles; the obtained aluminum-silicon alloy has good plasticity; and the size of silicon in the aluminum-silicon alloy can be regulated and controlled through the aging temperature and time, and the alloy with different kinds of yieldstrength and even ductility can be obtained by reasonably changing the aging parameters.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a heat treatment method of an aluminum alloy and a product obtained therefrom. Background technique [0002] As a casting alloy with low density, high corrosion resistance and low expansion coefficient, aluminum silicon alloy has a wide range of applications in the fields of automobiles and machinery. Silicon phase is an important strengthening phase in aluminum-silicon alloys, but its size is usually coarse and aggregated at the grain boundaries of the alloy. During the process of stress, the silicon phase is easy to cause stress concentration, which induces crack initiation and propagation, and finally leads to the fracture of the alloy. Therefore, the morphology and size of the silicon phase in the Al-Si alloy directly affect the mechanical properties of the alloy, especially the plasticity and fracture toughness. [0003] In the traditional process, the morphology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C21/14C22C21/16C22C1/02C22F1/043C22F1/057
CPCC22C1/026C22C21/02C22C21/14C22C21/16C22F1/043C22F1/057
Inventor 马朝利刘茂文肖文龙郑瑞晓
Owner BEIHANG UNIV
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