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Effect of void defect on c-axis deformation of single-crystal Ti under uniaxial stress conditions: Evolution of tension twinning and dislocations

Published online by Cambridge University Press:  02 October 2019

Yuming Qi ,
Xiuhua Chen  and
Miaolin Feng
Yuming Qi
Affiliation:
Department of Engineering Mechanics, State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai 200240, People’s Republic of China
Xiuhua Chen
Affiliation:
School of Aeronautics & Astronautics, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Miaolin Feng*
Affiliation:
Department of Engineering Mechanics, State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai 200240, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: mlfeng@sjtu.edu.cn
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Abstract

Deformation twins have a major role in the microstructure evolution of hexagonal close packed (HCP) metals. Voids are common defects in metals and have a significant impact on their properties. In this work, using molecular dynamics, a tension simulation of single-crystal titanium (Ti) with different void sizes under uniaxial stress conditions was performed. The results showed that the evolution and dominance of the $\left\{ {10\bar{1}2} \right\}$ twin system using the Henning potential was not consistent with the Schmid criterion when the single-crystal Ti contained void defects. From a microscopic perspective, the authors analyzed the relationship between the nucleation and growth of twins and the emission of dislocation loops. The authors found that the existence of voids not only contributes to the emission of dislocation loops but also hinders the movement of these loops. With the increase in void size, the peak dislocation density of ${1 \over 3}\left\langle {\bar{1}100} \right\rangle$ partial dislocation loops decreased. This work is helpful to further investigate the nucleation and evolution of tension twins and to form an effective growth criterion for twins to study the twinning process of HCP metals during plastic deformation.

Keywords

tension twinningdislocation loops emissiontwin variantsvoid defectsSchmid factor
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 21 , 14 November 2019 , pp. 3699 - 3706
Copyright
Copyright © Materials Research Society 2019 

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