Room Temperature Deformation-induced Solute Segregation and its Impact on Twin Boundary Mobility in a Mg-Y Alloy

被引：32

作者：

Wang, Xin ^{[1
]}

Hu, Yang ^{[1
]}

Yu, Kehang ^{[1
]}

Mahajan, Subhash ^{[2
]}

Beyerlein, Irene J. ^{[3
]}

Lavernia, Enrique J. ^{[1
]}

Rupert, Timothy J. ^{[1
]}

Schoenung, Julie M. ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Mat Sci & Engn, Irvine, CA 92617 USA

[2] Univ Calif Davis, Dept Mat Sci & Engn, Davis, CA USA

[3] Univ Calif Santa Barbara, Mech Engn Dept, Mat Dept, Santa Barbara, CA USA

来源：

SCRIPTA MATERIALIA | 2022年 / 209卷

基金：

美国国家科学基金会;

关键词：

Twinning; Basal-prismatic facet; Solute segregation; HAADF-STEM; Molecular dynamics; PLASTIC-DEFORMATION; MAGNESIUM; DUCTILITY; BEHAVIOR; BASAL; DISLOCATIONS; SLIP; MECHANISMS; GROWTH;

D O I：

10.1016/j.scriptamat.2021.114375

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Mechanical behavior of alloys is influenced by segregation of solute atoms, which affects deformation mechanisms, such as slip and twinning. In this study, we report on an atomic-scale investigation into room temperature, deformation-induced solute segregation in a Mg-Y alloy. High concentrations of Y were observed at the dislocation cores. In addition, we found that {10 (1) over bar2} twins were bounded by coher-ent twin boundaries and basal-prismatic facets, which contained periodic segregation of Y-rich columns and nano-sized Y-rich clusters, respectively. The observed segregation arrangement was energetically at-tributed to the fact that it minimizes the overall lattice distortion and is kinetically assisted by the dy-namic interaction between solute atoms and crystallographic defects and the slip-twin interaction during plastic deformation. Moreover, segregated Y atoms exert a pinning effect and lead to anisotropy on the mobility of twin boundaries. This finding offers a potentially new alloy design path to control the me-chanical response of Mg alloys. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：6