(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 

机构地区：[1]School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300401,China [2]Tianjin Institute of Aerospace Mechanical and Electrical Equipment,Tianjin 300301,China [3]Key Laboratory of Research and Application of Mould Materials for Glass and Rubber in Hebei Province,Huanghua 061000,China

出　　处：《China Foundry》2021年第3期217-222,共6页中国铸造（英文版）

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。

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 analysis.Results show that the as-cast alloy contains α-Mg,Mg_(24)(Gd,Y)_(5),and(Y,Gd)H_(2) phase.The(Y,Gd)H_(2) phase usually forms near the eutectic phase Mg_(24)(Gd,Y)_(5) or in the α-Mg grains,displaying a rectangle-shape.The 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 matrix.The thermodynamics calculation results reveal that the hydrogen dissolved in the melt leads to the formation of hydrides.It is also found that the(Y,Gd)H_(2) hydride can form directly from the liquid phase during solidification.Additionally,it can precipitate by the decomposition of Mg_(24)(Gd,Y)_(5) phase due to absorbing hydrogen from the remaining melt.

关 键 词：Mg-6Gd-3Y-0.5Zr alloy AS-CAST microstructure (Y Gd)H_(2)phase formation mechanism 

分 类 号：TG146.22[一般工业技术—材料科学与工程]