Pyramidal II to basal transformation of 'c plus a' edge dislocations in Mg-Y alloys

被引：32
|
作者：
Ahmad, Rasool [1 ]
Wu, Zhaoxuan [1 ,2 ]
Groh, Sebastien [3 ]
Curtin, W. A. [1 ]
机构：
[1] Ecole Polytech Fed Lausanne, Inst Mech Engn, Lab Multiscale Mech Modeling, CH-1015 Lausanne, Switzerland
[2] Inst High Performance Comp, 1 Fusionopolis Way,16-16 Connexis, Singapore 138632, Singapore
[3] Univ Basel, Dept Biomed Engn, CH-4123 Allschwil, Switzerland
来源：
SCRIPTA MATERIALIA | 2018年 / 155卷
基金：
瑞士国家科学基金会;
关键词：
mg-Y alloy; 'c plus a' dislocations; Molecular dynamics simulations; MEAM potentials; AUTOMOTIVE INDUSTRY; SOLID-SOLUTION; HCP METALS; MAGNESIUM; SLIP; DUCTILITY; TEMPERATURE; FAULT;
D O I：
10.1016/j.scriptamat.2018.06.026
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Transitions of pyramidal 'c + a' dislocations to sessile structures contribute to poor ductility in pure Mg. Mg-3 wt% Rare Earth (RE) alloys have good ductility, possibly due to 'c + a' dislocation stabilization upon addition of RE solutes. Here, 'c + a' stability is investigated in a model Mg-3 at.%Y random solid solution alloy using molecular dynamics simulations. Favorable fluctuations of Y solutes lower all dislocation energies and have no appreciable effects on the transition mechanism, energy barrier, or time. Enhanced 'c + a' activity and improved ductility in Mg-3 wt%RE alloys are thus not likely associated with solute-stabilization of pyramidal 'c + a' dislocations. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：114 / 118
页数：5
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