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Self-metamorphic treatment method for eutectic aluminum-silicon alloy

A eutectic aluminum-silicon modification technology, which is applied in the field of self-modification treatment of eutectic aluminum-silicon alloys, can solve the problems of reducing the fluidity of liquid aluminum-silicon alloys, the deterioration effect is easy to decline, and the growth of silicon crystals is limited, so as to save energy. The cost of modification treatment, the effect of improving mechanical properties and reducing oxidation burning loss

Active Publication Date: 2018-12-21
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sodium has been widely used for a period of time because of its obvious modification effect, but the modification effect is easy to decline, and it will reduce the fluidity of liquid aluminum-silicon alloy, hindering its further application
After adding strontium to aluminum-silicon alloy, strontium forms a film and adsorbs on the surface of Si crystal grains and α crystal nuclei, so that the α crystal nuclei will be preferentially crystallized and grown after adding strontium, which limits the growth of silicon crystals and refines Eutectic silicon, but the casting is not easy to remove hydrogen after the deterioration of strontium, and it is easy to form pinholes, and phosphorus, boron, antimony, etc. will poison the deterioration effect of strontium, which has great limitations

Method used

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  • Self-metamorphic treatment method for eutectic aluminum-silicon alloy
  • Self-metamorphic treatment method for eutectic aluminum-silicon alloy
  • Self-metamorphic treatment method for eutectic aluminum-silicon alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First, take 150g of eutectic aluminum silicon alloy and put it in a tubular annealing furnace for spheroidizing annealing treatment at 577°C for 3h to obtain granular Al-12.6wt.%Si of eutectic silicon for use. Microstructure such as figure 1 Shown. Take 150gAl-12.6wt.%Si eutectic aluminum-silicon alloy to remelt at 680℃, use eutectic aluminum-silicon alloy 0.1wt% C 2 Cl 6 Remove gas and slag from the melt (as a pseudo-metamorphic eutectic aluminum silicon alloy). Use 0.15g spheroidizing annealing Al-12.6wt.%Si alloy) to self-modify the eutectic aluminum-silicon alloy melt (addition amount is 0.1wt.%), fully stir and keep for 4min. The self-modified eutectic aluminum-silicon alloy melt is poured into a mold preheated at 100° C. to prepare a eutectic aluminum-silicon alloy with a diameter of 10 mm and a length of 100 mm.

[0036] image 3 This is a photo of the microstructure of the eutectic Al-Si alloy after self-modification with 0.1wt.% spheroidizing annealing Al-12.6wt....

Embodiment 2

[0038] First, take 150g of eutectic aluminum silicon alloy and put it in a tubular annealing furnace for spheroidizing annealing treatment at 577°C for 3h to obtain granular Al-12.6wt.%Si of eutectic silicon for use. Microstructure such as figure 1 Shown. Take 150gAl-12.6wt.%Si eutectic aluminum-silicon alloy to remelt at 680℃, use eutectic aluminum-silicon alloy 0.1wt% C 2 Cl 6 Remove gas and slag from the melt. Use 0.3g spheroidizing annealing Al-12.6wt.%Si alloy to self-modify the eutectic aluminum-silicon alloy melt (addition amount is 0.2wt.%), fully stirring and keeping the temperature for 4min. The self-modified eutectic aluminum-silicon alloy melt is poured into a mold preheated at 100° C. to prepare a eutectic aluminum-silicon alloy with a diameter of 10 mm and a length of 100 mm.

[0039] Figure 4 This is a photo of the microstructure of the eutectic Al-Si alloy after self-modification using 0.2wt.% spheroidizing annealing Al-12.6wt.%Si alloy at 680℃. Quantitative ana...

Embodiment 3

[0041] First, take 150g of eutectic aluminum silicon alloy and put it in a tubular annealing furnace for spheroidizing annealing treatment at 577°C for 3h to obtain granular Al-12.6wt.%Si of eutectic silicon for use. Microstructure such as figure 1 Shown. Take 150gAl-12.6wt.%Si eutectic aluminum-silicon alloy for remelting at 680℃, using 0.1wt% C 2 Cl 6 Remove gas and slag from the melt. Using 0.6g spheroidizing annealing Al-12.6wt.%Si alloy to self-modify the eutectic aluminum-silicon alloy melt (adding amount is 0.4wt.%), fully stirring and keeping the temperature for 4min. The self-modified eutectic aluminum-silicon alloy melt is poured into a mold preheated at 100° C. to prepare a eutectic aluminum-silicon alloy with a diameter of 10 mm and a length of 100 mm.

[0042] Figure 5 This is a photo of the microstructure of the eutectic Al-Si alloy after self-modification using 0.4wt.% spheroidizing annealing Al-12.6wt.%Si alloy at 680°C. Quantitative analysis shows that the prim...

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Abstract

The invention relates to the field of nonferrous metal preparation, in particular to a self-metamorphic treatment method for an eutectic aluminum-silicon alloy. According to the self-metamorphic treatment method for the eutectic aluminum-silicon alloy, the eutectic aluminum-silicon alloy after spheroidizing annealing treatment is taken as a metamorphic agent to perform self-metamorphic treatment on an eutectic aluminum-silicon alloy body; and the spheroidized and annealed eutectic aluminum-silicon alloy with the weight percentage being 0.1-1.0% is adopted, after the metamorphic treatment is performed on the eutectic aluminum-silicon alloy within the temperature range of 630-750 DEG C, the microscopic tissue of the eutectic aluminum-silicon alloy is obviously improved, and the mechanical property of the eutectic aluminum-silicon alloy is significantly improved.

Description

Technical field [0001] The invention relates to the field of preparation and processing of non-ferrous metal materials, in particular to a self-modification treatment method of a eutectic aluminum-silicon alloy. Background technique [0002] Eutectic aluminum-silicon alloy has the advantages of easy casting and welding, light weight, strong corrosion resistance, etc. It is widely used in the automobile or piston preparation industry. In the unmodified eutectic aluminum-silicon alloy, the eutectic silicon exists in the form of thick lath or needles, which causes serious damage to the aluminum matrix and causes the stress to be concentrated on the sharp or angular parts of the structure. Furthermore, it is easy to cause the alloy to crack along the grain boundary or at the lath-like silicon phase, reducing the plasticity and cutting performance of the alloy. Technologists and industries often use modification treatment to improve the morphology and size of eutectic silicon to meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/02
CPCC22C1/026C22C1/03C22C21/02
Inventor 王建华李宏宝彭浩平涂浩苏旭平
Owner CHANGZHOU UNIV
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