半固态等温热处理对Mg-7Zn-1Cu-0.3V镁合金非枝晶组织的影响

doi:10.11896/cldb.19060165

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Abstract In this paper, the effects of holding temperature and holding time on the semi-solid non-dendritic microstructure evolution of Mg-7Zn-1Cu-0.3V magnesium alloy were studied by semi-solid isothermal heat treatment. The results show that the semi-solid isothermal heat treatment can transform the original dendritic structure of the Mg-7Zn-1Cu-0.3V alloy into semi-solid non-dendritic structure, and finally obtain small, round and evenly distributed spherical particles. Prolonging the isothermal time or increasing the holding temperature is beneficial to the separation and spheroidization of non-dendritic structures. However, when the holding temperature is too high or the time is too long, the semi-solid particles will merge and grow, and the main evolution mechanism is in accordance with the Ostwald ripening mechanism. During the whole isothermal heat treatment process, the semi-solid microstructure evolution mainly experienced three stages: initial coarsening, tissue separation and spheroidization, particle combination and ripening. The best isothermal heat treatment process of Mg-7Zn-1Cu-0.3V alloy is held for 35 min at the holding temperature of 580 ℃. The average size, solid phase rate and shape factor of non-dendritic particles are 33.25 μm, 45% and 1.33, respectively.

Key words： Mg-7Zn-1Cu-0.3V magnesium alloy semi-solid isothermal heat treatment non-dendritic structure microstructural evolution

Published: 14 July 2020

CLC number:

TG146.22

Fund:This work was financially supported by the National Natural Science Foundation of China (51464032).

About author:: Xiaofeng Huangreceived his Ph.D. degree from Harbin Institute of Technology (HIT) in January 2002 and obtained post-doctoral from Shanghai Jiao Tong University in May 2004, and entered Lanzhou University of Technology/State Key Laboratory of Advanced Proces-sing and Recycling of Nonferrous Metals, Lanzhou University of Technology in June 2004. He is currently an associate professor and master tutor. His research inte-rests focus on the advanced and high performance light metals, semi-solid forming of light alloy and precision plastic working. He hosted and participated in 3 provincial and ministerial level fund projects and two “863” programs. He has published more than 80 journal papers, applied 4 national invention patents, and is also a reviewer of several academic journals.

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	HUANG Xiaofeng
	WEI Langlang
	YANG Jianqiao
	ZHANG Qiaoqiao
	SHANG Wentao
	LI Xujiao

Cite this article:

HUANG Xiaofeng,WEI Langlang,YANG Jianqiao, et al. Effect of Semi-Solid Isothermal Heat Treatment on Non-dendritic Structure of Mg-7Zn-1Cu-0.3V Magnesium Alloy[J]. Materials Reports, 2020, 34(14): 14116-14121.

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http://www.mater-rep.com/EN/10.11896/cldb.19060165 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14116

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