Non-dendritic Microstructure Evolution Process and Mechanism of Mg-7Zn-0.2Ti-xCu Magnesium Alloys
HUANG Xiaofeng1,2,*, ZHANG Zhanyu1, SHANG Wentao1, YANG Fan1, ZHANG Sheng1
1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 2 Key Laboratory of Nonferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: Semi-solid billets of Mg-7Zn-0.2Ti-xCu (x=0, 0.5, 1.0, 1.5, mass fraction/%) alloys were prepared by isothermal heat treatment. The effects of Cu content on the as-cast and semi-solid microstructure of Mg-7Zn-0.2Ti-xCu alloy were investigated. Meanwhile, the effects of isothermal temperature and holding time on the evolution of the semi-solid microstructure of Mg-7Zn-0.2Ti-1Cu alloy were also studied, and the evolution mechanism of non-dendritic microstructure during isothermal heat treatment was analyzed. The results show that during the semi-solid thermal transformation, the size and shape factor of solid particles decrease first and then increase with the increase of isothermal temperature and holding time. Meanwhile, the as-cast microstructure and the diffusion behavior of solute atoms are the main factors affecting the non-dendritic microstructure and evolution of the non-dendritic microstructure during isothermal heat treatment. When Cu content reaches 1.0% (mass fraction), the as-cast microstructure of the alloy is fine, and the optimization effect of Cu on the non-dendritic microstructure is the best. The non-dendritic microstructure of Mg-7Zn-0.2Ti-1Cu alloy obtained by holding at 600 ℃ for 30 min is relatively ideal, and the average solid particles size, shape factor, and solid fraction are 43.12 μm, 1.46 and 59.77%, respectively, which meet the requirements of semi-solid metal forming.
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2022, Vol. 36 
