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Atomistic simulation of the strain-hardening behavior of bicrystal Cu nanowires

Published online by Cambridge University Press:  16 December 2013

Lin Yuan ,
Debin Shan ,
Zhenhai Xu ,
Lumeng Wang  and
Bin Guo
Lin Yuan
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Debin Shan*
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Zhenhai Xu
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Lumeng Wang
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Bin Guo
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
*
a)Address all correspondence to this author. e-mail: d.b.shan@gmail.com
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Abstract

To determine whether plastic-hardening behavior occurs in metal nanowires, an atomistic simulation was performed to investigate the tension process in a bicrystal Cu nanowire. The results indicate that bicrystal Cu nanowires exhibit strain-hardening behavior, unlike their single-crystal counterparts. The strain-hardening behavior is related to the orientation of two crystal grains, and the number of atoms determines whether strain-hardening behavior occurs in the asymmetrically tilted bicrystal Cu nanowires. Strain hardening occurs in almost bicrystal Cu nanowires with different orientation angles. The initial yield stress is determined by the grain whose orientation angle is closer to 45° among the two crystal grains, resulting in a high value of the tilting tendency factor, and thus making it easier to generate slip.

Keywords

strain hardeningnanowiresyield stressplasticityatomistic simulation
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 24 , 28 December 2013 , pp. 3339 - 3346
Copyright
Copyright © Materials Research Society 2013 

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