Semi-solid Microstructure Evolution of Mg-6Zn-1Cu-0.3Mn Magnesium Alloy
HUANG Xiaofeng1,2, ZHANG Qiaoqiao1, MA Yajie1, WEI Langlang1, YANG Jianqiao1
1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050 2 Key Laboratory of Non-ferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050
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.
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2019, Vol. 33 
