Segregation and clustering of solutes at grain boundaries in Mg-rare earth solid solutions

被引：192

作者：

Bugnet, M. ^{[1
]}

Kula, A. ^{[1
,2
]}

Niewczas, M. ^{[1
]}

Botton, G. A. ^{[1
]}

机构：

[1] McMaster Univ, Dept Mat Sci & Engn, Hamilton, ON L8S 4L7, Canada

[2] AGH Univ Sci & Technol, Krakow, Poland

来源：

ACTA MATERIALIA | 2014年 / 79卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Magnesium-rare earth alloy; Solid solution; Segregation; Grain boundary; Scanning transmission electron microscopy; TRANSMISSION ELECTRON-MICROSCOPY; PEAK HARDNESS CONDITION; MAGNESIUM-BASED ALLOYS; DEFORMATION-BEHAVIOR; STRUCTURAL-CHANGES; HAADF-STEM; TEXTURE; GD; PHASE; RECRYSTALLIZATION;

D O I：

10.1016/j.actamat.2014.06.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present study validates the previously reported investigations about segregation of rare-earth (RE) elements at grain boundaries in Mg-RE alloys and ultimately provides a direct visualization of the distribution of the solute atoms in the structure of a Mg-Gd alloy. It is demonstrated that Gd forms a solid solution within the Mg matrix in addition to substantial segregation at high-angle grain boundaries in the form of 1-2 nm clusters, with a postulated face-centered cubic Gd structure. The results suggest significant implications for the texture development during alloy processing and recrystallization, and thus for the mechanical behavior and properties of Mg-RE alloys. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：66 / 73

页数：8

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