(Y,Gd)H_(2) phase formation in as-cast Mg-6Gd-3Y-0.5Zr alloy

作     者：Fei Wang Bin-guo Fu Yu-feng Wang Tian-shun Dong Guo-lu Li Xue-bo Zhao Jin-hai Liu Gui-xian Zhang Fei Wang;Bin-guo Fu;Yu-feng Wang;Tian-shun Dong;Guo-lu Li;Xue-bo Zhao;Jin-hai Liu;Gui-xian Zhang

作者机构：School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China Tianjin Institute of Aerospace Mechanical and Electrical EquipmentTianjin 300301China Key Laboratory of Research and Application of Mould Materials for Glass and Rubber in Hebei ProvinceHuanghua 061000China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2021年第18卷第3期

页      面：217-222页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by the Key Project of Equipment Pre-research Field Fund under Grant No.61409230407 the National Natural Science Foundation of China(NSFC)under Grant No.51601054 the Central Government Guides Local Science and Technology Development Fund Projects under Grant No.206Z1005G 

主　　题：Mg-6Gd-3Y-0.5Zr alloy as-cast microstructure (Y,Gd)H_(2)phase formation mechanism 

摘      要：In this work,a new(Y,Gd)H_(2) precipitate was identified and systematically investigated in the as-cast Mg-6Gd-3Y-0.5Zr alloy by XRD,SEM with EDS,TEM with EDS techniques and thermodynamics *** show that the as-cast alloy contains α-Mg,Mg_(24)(Gd,Y)_(5),and(Y,Gd)H_(2) ***(Y,Gd)H_(2) phase usually forms near the eutectic phase Mg_(24)(Gd,Y)_(5) or in the α-Mg grains,displaying a *** Mg_(24)(Gd,Y)_(5) and(Y,Gd)H_(2) phases crystalize in bcc and fcc structure,respectively,and the(Y,Gd)H_(2) phase has a semi-coherent relationship with α-Mg *** thermodynamics calculation results reveal that the hydrogen dissolved in the melt leads to the formation of *** is also found that the(Y,Gd)H_(2) hydride can form directly from the liquid phase during ***,it can precipitate by the decomposition of Mg_(24)(Gd,Y)_(5) phase due to absorbing hydrogen from the remaining melt.