Preparation Technology of Hypoeutectic Al-Si Alloy Inoculated with High Entropy Alloy

A high-entropy alloy and aluminum-silicon alloy technology is applied in the field of aluminum-silicon alloy inoculation, which can solve the problems of splitting the continuity of the alloy matrix and reducing the mechanical properties of the hypoeutectic aluminum-silicon alloy.

Active Publication Date: 2021-01-29
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The microstructure of the hypoeutectic aluminum-silicon alloy is mainly composed of α-Al and eutectic silicon. The α-Al is a thick dendrite, while the eutectic silicon is in the shape of elongated needles. The structure severely splits the continuity of the alloy matrix; thereby significantly reducing the mechanical properties of the hypoeutectic Al-Si alloy

Method used

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  • Preparation Technology of Hypoeutectic Al-Si Alloy Inoculated with High Entropy Alloy
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  • Preparation Technology of Hypoeutectic Al-Si Alloy Inoculated with High Entropy Alloy

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Embodiment

[0019] (1) First prepare the AlCoCrFeNiTix (x=0.5~1.5) high-entropy alloy inoculant, and mix the six metal elements of Al, Co, Cr, Fe, Ni, and Ti with a purity greater than 99.9% according to the molar ratio, and put them into a vacuum In an electric arc furnace, under the protection of high-purity argon, it was smelted with a current of 200A for 2.0min to 5.0min until it was completely melted, and it was smelted repeatedly for 5 to 6 times to ensure that its composition was uniform, and then a 40g high-entropy alloy sample was obtained.

[0020] (2) Mix industrial pure aluminum and Al-20Si alloy in proportion, heat it in a Si-C rod crucible furnace at 800°C until completely melted, then keep it at 750°C for 15 minutes to obtain Al-(6~9) Si alloy melt;

[0021] (3) 0.8wt%C 2 C l6 Cover with aluminum foil and press into the melt in step (2), pass high-purity argon, stir and refine, remove slag and gas, and then pour it into a metal mold at 720 ° C to solidify and form to obta...

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Abstract

The invention discloses a high-entropy alloy-inoculated hypoeutectic aluminum-silicon alloy preparation process. First, AlCoCrFeNiTix (x=0.5-1.5) high-entropy alloy is prepared; pure aluminum and Al-20Si alloy are mixed and melted to obtain an alloy melt, which is obtained by refining and pouring Hypoeutectic Al-(6-9) Si alloy; the high-entropy alloy is used as an inoculant and added to the hypo-eutectic Al-(6-9) Si alloy with different mass fractions to inoculate it to obtain fine and uniform The eutectic silicon α-Al equiaxed crystal structure improves the mechanical properties of the hypoeutectic aluminum-silicon alloy. The beneficial effect of the present invention is that the inoculant can refine α-Al grains, obtain fine and evenly distributed eutectic silicon structures, and reduce the tendency of splitting the matrix and stress concentration.

Description

technical field [0001] The invention belongs to the technical field of aluminum-silicon alloy inoculation, and relates to a preparation process for inoculating a hypoeutectic aluminum-silicon alloy. Background technique [0002] Aluminum-silicon alloy is a casting alloy with aluminum and silicon as the main elements. It is widely used in the production of cylinder blocks of automobile engines due to its advantages such as low density, high specific strength, good thermal conductivity, small thermal expansion coefficient, wear resistance, and corrosion resistance. , cylinder head, wheel hub and piston and other components, reduce vehicle weight, reduce fuel consumption and carbon dioxide gas emissions. The microstructure of the hypoeutectic aluminum-silicon alloy is mainly composed of α-Al and eutectic silicon. The α-Al is a thick dendrite, while the eutectic silicon is in the shape of elongated needles. The organization severely splits the continuity of the alloy matrix; th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/02
CPCC22C1/026C22C1/03C22C21/02
Inventor 李庆林赵尚住玉乾李斌强兰晔峰刘建军
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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