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Quantitative understanding of the effect of grain rotation on the nanovoid growth

Published online by Cambridge University Press:  02 November 2018

Xudong Li  and
Jianqiu Zhou
Xudong Li
Affiliation:
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu Province 210009, China; and Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing Tech University, Nanjing, Jiangsu Province 210009, China
Jianqiu Zhou*
Affiliation:
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu Province 210009, China; Department of Mechanical Engineering, Wuhan Institute of Technology, Wuhan, Hubei Province 430070, China; and Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing Tech University, Nanjing, Jiangsu Province 210009, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A mechanical model is developed to explain the influence of grain rotation on nanovoid growth in nanocrystalline solids in the current paper. In the framework of the mechanical model, the dislocations released from the nanovoid surface will be affected by four stresses: the driving stress induced by far-field stress, the stress arising from grain rotation, the image stress caused by the free surface of the nanovoid, and the back stress generated by the previously emitted dislocations. Furthermore, under the condition of different rotational strength and surface effects, we analyzed in detail the influence of the important parameters such as nanovoid radius, nucleation radius, dislocation emission angle, relative distance, rotation grain size, rotation coefficient, and direction angle on the critical stress. Finally, we discuss the effect of the coupling of rotational deformation and the grain boundary on the growth of the nanovoid. As a conclusion, the high stress nearby the nanovoid can be released by grain rotation, which inhibits the growth of the nanovoid.

Keywords

nanovoidgrain rotationnanocrystallinedislocationgrainboundaryrotational strength
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 2 , 28 January 2019 , pp. 271 - 281
Copyright
Copyright © Materials Research Society 2018 

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