Semi-solid microstructure evolution of Mg-7Zn-0.3Mn-xCu alloy

被引：0
|
作者：
Huang X.-F. [1 ,2 ]
Yang J.-Q. [1 ]
Wei L.-L. [1 ]
Zhang Q.-Q. [1 ]
Shang W.-T. [1 ]
Li X.-J. [1 ]
机构：
[1] State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou
[2] Key Laboratory of Non-ferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou
来源：
Huang, Xiao-Feng (huangxf_lut@163.com) | 1600年 / Central South University of Technology卷 / 30期
基金：
中国国家自然科学基金;
关键词：
Cu content; Evolution mechanism; Mg-7Zn-0.3Mn-1Cu magnesium alloy; Non-dendritic microstructure;
D O I：
10.11817/j.ysxb.1004.0609.2020-36434
中图分类号：
学科分类号：
摘要：
The effects of Cu content (0%, 0.5%, 1.0%, 1.5%), remelting temperature and holding time on the evolution of semi-solid non-dendrites of Mg-7Zn-0.3Mn magnesium alloy were studied. The results show that the cast microstructure of the Mg-7Zn-0.3Mn-1Cu alloy is composed of white α-Mg matrix and black eutectic phase (α-Mg+Mg4Zn7+ MgZn2+CuMnZn). And Cu accelerated the separation and spheroidization of non-dendritic particles during isothermal heat treatment, and the effect is optimal when the Cu content (mass fraction) is 1.0%. By properly raising the holding temperature or extending the holding time, Mg-7Zn-0.3Mn-1Cu can obtain finer and more uniform spherical particles. However, when the holding temperature exceeds 585℃ or the holding time exceeds 20 min, semi-solid particles will gradually coarsene. This coarsening growth phenomenon is generated by the combined growth mechanism and Ostwald maturation mechanism. During the whole isothermal heat treatment process, the semi-solid microstructure evolution mainly experiences four stages: initial coarsening, tissue separation, spheroidization and final coarsening. The best parameters of isothermal heat treatment of Mg-7Zn-0.3Mn-1Cu are 585℃ in holding temperature, 20 min in holding time, and the average particle size, shape factor and solid fraction are 38.85 μm, 1.39 and 53.38%, respectively. © 2020, Science Press. All right reserved.
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页码：1238 / 1248
页数：10
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