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

被引：34

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

页码：114 / 118

页数：5

共 27 条

[1] Connections between the basal I1 "growth" fault and ⟨c plus a⟩ dislocations [J].