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苏娟,郭锋,蔡会生,刘亮,陈宝东.Zn固溶量对Mg-Zn-Y合金组织的影响[J].稀有金属材料与工程(英文),2019,48(7):2179~2184.[Su Juan,Guo Feng,Cai Huisheng,Liu Liang and Chen Baodong.Effect of solid solution amount of Zn on Microstructure of Mg-Zn-Y alloy[J].Rare Metal Materials and Engineering,2019,48(7):2179~2184.]
Effect of solid solution amount of Zn on Microstructure of Mg-Zn-Y alloy
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Received:March 29, 2018  Revised:April 19, 2018
Key words: Rare earth Y  magnesium alloy  electrochemical  microstructure
Foundation item:国家自然科学基金(51661025)、内蒙古自治区自然科学基金(2013ZD10)、内蒙古工业大学科学研究项目(X201506)资助
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Su Juan,Guo Feng,Cai Huisheng,Liu Liang and Chen Baodong  
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      The second phase in Mg-Zn-Y alloy was successfully extracted by electrochemical phase separation, and the solid solution amount of alloy elements in Mg-Zn-Y alloy was obtained. A method for direct determination of solid solution in magnesium alloy was established. The activity and activity interaction coefficients of Zn in Mg-Zn-Y ternary alloy were calculated by using Miedema mixed enthalpy model and Toop model (symmetry) and Kohler model (asymmetric). The experimental measurements and calculations show that the interaction coefficients of Zn and Y in Mg-Zn-Y alloy are positive, which shows that Zn and Zn, Zn and Y are mutually exclusive in this system. The existence of Y can improve the activity of Zn, that is, the increase of Y solution will lead to the decrease of the solid solution amount of Zn. Thus, the supercooled degree of the liquid phase in the front of the solid-liquid interface is increased, so that the grain is refined, and the Mg3Y2Zn3 eutectic phase of the grain boundary is increased and the mesh is gradually continuous.