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An energy analysis of nanovoid nucleation in nanocrystalline materials with grain boundary sliding accommodations

Published online by Cambridge University Press:  15 January 2014

Lu Wang ,
Jianqiu Zhou ,
Shu Zhang ,
Yingguang Liu ,
Hongxi Liu ,
Ying Wang  and
Shuhong Dong
Lu Wang
Affiliation:
Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China
Jianqiu Zhou*
Affiliation:
Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China; and Department of Mechanical Engineering, Wuhan Institute of Technology, Wuhan, Hubei 430070, China
Shu Zhang
Affiliation:
Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China
Yingguang Liu
Affiliation:
Department of Energy and Power Engineering, North China Electric Power University, Baoding, Hebei 071003, China
Hongxi Liu
Affiliation:
Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China
Ying Wang
Affiliation:
Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China
Shuhong Dong
Affiliation:
Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China
*
a)Address all correspondence to this author. e-mail: zhouj@njut.edu.cn
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Abstract

A theoretical model of nanovoid nucleation at triple junctions in nanocrystalline materials is developed in this article. The sliding of grain boundaries (GBs) meeting at triple junctions, which can be attributed to the gliding of GB dislocations (GBDs), provides the driving force for nanovoid nucleation. The GB sliding is accommodated by the emission of partial dislocations from GBs as well as GB diffusion. The corresponding energy characteristics of the pile-ups of GBDs, the emission of partial dislocations from the GBs, and GB diffusion are calculated, respectively. Furthermore, an energy balance method to calculate the nucleation of nanovoid at triple junctions is studied. The analysis demonstrates that the nucleation of the triple junction nanovoid depends mainly on the applied stress, the GB length (length of the pile-up), the GB structures, and the GB sliding accommodations.

Keywords

void nucleationnanocrystalline materialsdislocationsgrain boundary sliding
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 2 , 28 January 2014 , pp. 277 - 287
Copyright
Copyright © Materials Research Society 2013 

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References

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