Electron beam irradiation induced metastable phase in a Mg-9.8 wt%Sn alloy

作     者：Chaoqiang Liu Houwen Chen Min Song Jian-Feng Nie Chaoqiang Liu;Houwen Chen;Min Song;Jian-Feng Nie

作者机构：State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha410083China College of Materials Science and EngineeringChongqing UniversityChongqing400044China Electron Microscopy CenterChongqing UniversityChongqing400044China Department of Materials Science and EngineeringMonash UniversityVictoria3800Australia 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第84卷第25期

页      面：133-138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 National Natural Science Foundation of China(51771036 and 51421001) 

主　　题：Mg-Sn alloys Metastable phase Irradiation HAADF-STEM Density functional theory 

摘      要：Aberration-corrected scanning transmission electron microscopy has been used to study a novel metastable phase,designated asβ’’phase,induced to form by electron beam irradiation in a Mg-9.8 wt.%Sn *** phase is spherical in three dimensions,having a D019 structure with the lattice parameters of a=0.642 nm,c=0.521 nm and space group of P63/*** chemical formula is Mg_(3)Sn,like theβ’metastable precipitate *** orientation relationship between theβ’’phase and theα-Mg matrix is such that■_(β)’’//■_(α)and(0001)_(β)’’//(0001)_(α).Its formation involves solely the ordering of Sn atoms in the solid solution magnesium ***-principles calculations indicate that the formation of theβ’’phase is energetically favored.