Effect of twin boundary on the initial yield behavior of magnesium nanopillars under compression: molecular dynamics simulations

被引：2
作者：
Mei, Hai [1 ]
Xu, Shuang [2 ]
Liu, Lisheng [2 ]
She, Wuchang [2 ]
Li, Jun [2 ]
Fu, Zhengyi [1 ]
机构：
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
[2] Wuhan Univ Technol, Hubei Key Lab Theory & Applicat Adv Mat Mech, Wuhan 430070, Hubei, Peoples R China
来源：
MATERIALS RESEARCH EXPRESS | 2018年 / 5卷 / 02期
基金：
中国国家自然科学基金;
关键词：
twin boundary; magnesium; Nanopilar; yield behavior; molecular dynamics simulation; DEFORMATION MECHANISMS; NANOTWINNED METALS; ALLOY; CRYSTALS;
D O I：
10.1088/2053-1591/aaab91
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Nanotwinned Mg nanopillars under uniaxial compression were investigated by molecular dynamics simulations. The simulation results indicate that more {10 (1) over bar1} < 10 (1) over bar(2) over bar > TBs and less {10 (1) over bar2} < 10 (1) over bar(1) over bar > TBs are recommended to introduce for obtaining Mg nanopillars being of higher compressive yield strength. The pre-built {10 (1) over bar1} < 10 (1) over bar(2) over bar > TBs restrains the nucleation of new twins, and subsequently causes the increase of the yield strength. The initial yield behavior of nanotwinned Mg nanopillars with {10 (1) over bar1} < 10 (1) over bar(2) over bar > TBs was found to be twinning nucleation, and the nucleation mechanism is a shuffling mechanism. The introduction of {10 (1) over bar2} < 10 (1) over bar(1) over bar > TBs bring sources of dislocations into Mg nanopillars and subsequently causes the decrease of yield strength.
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页数：8
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