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Preparation process of hypoeutectic aluminum-silicon alloy inoculated by high-entropy alloy

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

Active Publication Date: 2019-01-04
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 process of hypoeutectic aluminum-silicon alloy inoculated by high-entropy alloy
  • Preparation process of hypoeutectic aluminum-silicon alloy inoculated by high-entropy alloy
  • Preparation process of hypoeutectic aluminum-silicon alloy inoculated by high-entropy alloy

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Embodiment

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

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

[0021] (3) 0.8wt% C2Cl6 is covered with aluminum foil and pressed into the melt of step (1), high-purity argon gas is introduced, stirring and refining, slag removal and degassing, and then poured into a metal mold at 720 ° C...

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Abstract

The invention discloses a preparation process of hypoeutectic aluminum-silicon alloy inoculated by high-entropy alloy. The preparation process comprises the following steps: first, preparing AlCoCrFeNiTix (x=0.5-1.5) high-entropy alloy; mixing pure aluminum and Al-20 Si alloy, melting to obtain an alloy melt and obtaining hypoeutectic Al-(6-9)Si alloy through refined pouring; adding the high-entropy alloy as an inoculant in the hypoeutectic Al-(6-9)Si alloy at different mass fractions for inoculation treatment to obtain a fine and uniform eutectic silicon alpha-Al equiaxed crystal structure. Therefore, the mechanical property of the hypoeutectic aluminum-silicon alloy is improved. The preparation process disclosed by the invention has the benefits that the inoculant can refine alpha-Al crystal grains and obtain the fine and uniformly-distributed eutectic silicon structure, so that the trends of a splitting effect and a stress concentration on a matrix are reduced.

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 cast 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 of low density, high specific strength, good thermal conductivity, low thermal expansion coefficient, wear resistance and corrosion resistance. , cylinder head, wheel hub and piston and other components, reduce the weight of the car, reduce fuel consumption and carbon dioxide gas emissions. The microstructure of the hypoeutectic Al-Si alloy is mainly composed of α-Al and eutectic silicon. The α-Al is a coarse dendrite, while the eutectic silicon is slender needle-like The microstructure severely disrupts the continuity of the alloy matrix; thus, the mechanical proper...

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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 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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