Al<sub>3</sub>Ti/Al-Si-Cu-V-Zr合金复合材料显微组织及拉伸性能

doi:10.11896/cldb.21020142

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Abstract In this work, K₂TiF₆ salt was added into the Al-Si-Cu-V-Zr alloy melt, and the Al₃Ti strengthening phases of different contents were introduced into Al-Si-Cu-V-Zr alloy through the melting in-situ reaction method. The microstructure and mechanical properties of the as-cast xAl₃Ti/Al-Si-Cu-V-Zr composite were studied. The results showed that the composite was composed of α-Al, eutectic Si, Al₂Cu and (Al,Si)₃M((Al,Si)₃-(Zr,V), (Al,Si)₃(Ti,Zr,V)) phases. With the addition of K₂TiF₆ salt increasing, the (Al,Si)₃M phase changed from strip to equiaxed particle, and the α-Al phase turned more fine and the strip eutectic silicon changed into the fine short fiber. The aspect ratio of eutectic silicon and the ave-rage particle size of (Al,Si)₃M phase decreased with K₂TiF₆ salt addition increasing. The tensile properties of aluminum matrix composites were improved after introducing (Al,Si)₃M reinforcing phase. The tensile strength and yield strength of composites containing 6wt%Al₃Ti were 239.3 MPa and 85.3 MPa, respectively, 28.6% and 28.8% higher than those of the matrix alloys. It was found that the Al₃Ti phase in the residual liquid phase indirectly refined the eutectic silicon by refining the α-Al in the eutectic structure. Fine and short fiber eutectic silicon reinforcement and fine (Al,Si)₃M particle reinforcement were the main reasons for the improvement of the mechanical properties of the composites, while coarse (Al,Si)₃M brittle phase was harmful to the improvement of mechanical properties.

Key words： Al-Si-Cu alloy the average particle size aspect ratio microstructure tensile properties

Published: 25 April 2022 Online: 2022-04-27

CLC number:

TG146.2

Fund:Special Project of Material Processing of Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials (2021GXMPSF04), Nanning Scientific Research and Technology Development Program (20171005-1), Guangxi University Research Fund Project (XJZ100343) and Innovation and Entrepreneurship Training Program for College Students of Guangxi University (202010593056).

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	ZENG Guangkai
	CUI Junge
	WANG Yuchen
	CHEN Kailun
	PAN Senxin
	PAN Liwen
	HU Zhiliu

Cite this article:

ZENG Guangkai,CUI Junge,WANG Yuchen, et al. Microstructure and Tensile Properties of Al₃Ti/Al-Si-Cu-V-Zr Alloy Composites[J]. Materials Reports, 2022, 36(8): 21020142-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21020142 OR http://www.mater-rep.com/EN/Y2022/V36/I8/21020142

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