Mg-6Zn-1Cu-0.3Mn镁合金的半固态组织演变

doi:10.11896/cldb.18080139

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Abstract The effects of remelting temperature and holding time for the semi-solid microstructure evolution of Mg-6Zn-1Cu-0.3Mn magnesium alloy were studied by semi-solid isothermal heat treatment. The results show that with holding temperature and time prolonging, the acceleration of the remelting process and change in the microstructure is acquired, in the process of spherical evolution at different temperatures for 30 min or at 585 ℃ for different time. The average size and shape factor of the spherical semi-solid microstructure first decrease and then increase, while the solid fraction decreases sharply. The grain boundaries and sub-boundaries both provide the solute atoms with diffusion aisles and the liquid phase with interpenetration path, and the “liquid pools” of high solute concentration form at the rich Zn, Cu and Mn solute atoms regions and the dendrite arms overlap. With the holding temperature exceeding 585 ℃ or the heat preservation time over 30 min, the primary particles tend to merge and grow up, consistent with the rule of Ostwald ripening mechanism. The fitting heat treatment parameters is reheating for 30 min at 585 ℃ for semi-solid isothermal heat treatment of the alloy, and the average particle size, shape factor and solid fraction of the alloy are 29.91 μm, 1.09 and 47.55%, respectively.

Key words： Mg-6Zn-1Cu-0.3Mn magnesium alloy semi-solid structure semi-solid isothermal heat treatment spherical evolution

Published: 29 August 2019

CLC number:

TG146.22

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 three provincial and ministerial level fund projects and two “863” programs. He has published more than 80 journal papers, applied four national invention patents, and he is also a reviewer of several academic journals.

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	HUANG Xiaofeng
	ZHANG Qiaoqiao
	MA Yajie
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	YANG Jianqiao

Cite this article:

HUANG Xiaofeng,ZHANG Qiaoqiao,MA Yajie, et al. Semi-solid Microstructure Evolution of Mg-6Zn-1Cu-0.3Mn Magnesium Alloy[J]. Materials Reports, 2019, 33(20): 3441-3447.

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http://www.mater-rep.com/EN/10.11896/cldb.18080139 OR http://www.mater-rep.com/EN/Y2019/V33/I20/3441

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