Experimental study and cellular automaton simulation on solidification microstructure of Mg-Gd-Y-Zr alloy

作     者：Xu-Yang Wang Fei-Fan Wang Ke-Yan Wu Xian-Fei Wang Lv Xiao Zhong-Quan Li Zhi-Qiang Han Xu-Yang Wang;Fei-Fan Wang;Ke-Yan Wu;Xian-Fei Wang;Lv Xiao;Zhong-Quan Li;Zhi-Qiang Han

作者机构：School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology(Ministry of Education)Tsinghua UniversityBeijing 100084China Shanghai Spaceflight Precision Machinery InstituteShanghai 201600China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2021年第40卷第1期

页      面：128-136页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Key Research and Development Program of China(No.2016YFB0701204) the National Science and Technology Major Project of China(No.2017ZX04006001) the National Natural Science Foundation of China(No.U1737208) 

主　　题：Solidification microstructure Mg-Gd-Y-Zr alloy Cooling rate Zr content Nucleation Cellular automaton 

摘      要：The solidification microstructure of Mg-Gd-YZr alloy was investigated via an experimental study and cellular automaton(CA)*** this study,stepshaped castings were produced,and the temperature variation inside the casting was recorded using thermocouples during the solidification *** effects of the cooling rate and Zr content on the grain size of the Mg-Gd-Y-Zr alloy were *** results showed that the grain size decreased with an increase in the cooling rate and Zr *** on the experimental data,a quantitative model for calculating the heterogeneous nucleation rate was developed,and the model parameters were *** evolution of the solidification microstructure was simulated using the CA method,where the quantitative nucleation model was used and a solute partition ceoefficient was introduced to deal with the solute trapping in front of the solid-liquid(S/L)*** simulation results of the grain size were in good agreement with the experimental *** simulation also showed that the fraction of the eutectics decreased with an increasing cooling rate in the range of 2.6-11.0℃·s^(-1),which was verified indirectly by the experimental data.