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

被引：8

作者：

Liu, Chaoqiang ^{[1
,2
]}

Chen, Houwen ^{[2
,3
]}

Song, Min ^{[1
]}

Nie, Jian-Feng ^{[4
]}

机构：

[1] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

[2] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[3] Chongqing Univ, Electron Microscopy Ctr, Chongqing 400044, Peoples R China

[4] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2021年 / 84卷

基金：

中国国家自然科学基金;

关键词：

Mg-Sn alloys; Metastable phase; Irradiation; HAADF-STEM; Density functional theory; AGE-HARDENING RESPONSE; ORIENTATION RELATIONSHIPS; MG; ZN; CRYSTALLOGRAPHY; MICROSTRUCTURE; PRECIPITATE; MAGNESIUM; SEGREGATION; RESISTANCE;

D O I：

10.1016/j.jmst.2020.12.043

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Aberration-corrected scanning transmission electron microscopy has been used to study a novel metastable phase, designated as beta '' phase, induced to form by electron beam irradiation in a Mg-9.8 wt.%Sn alloy. This phase is spherical in three dimensions, having a D0(19) structure with the lattice parameters of a = 0.642 nm, c =0.521 nm and space group of P6(3)/mmc. Its chemical formula is Mg3Sn, like the beta' metastable precipitate phase. The orientation relationship between the beta '' phase and the alpha-Mg matrix is such that [2 (1) over bar(1) over bar0](beta '')//[2 (1) over bar(1) over bar0](alpha) and (0001)(beta '')// (0001)(alpha). Its formation involves solely the ordering of Sn atoms in the solid solution magnesium matrix. First-principles calculations indicate that the formation of the beta '' phase is energetically favored. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：133 / 138

页数：6

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