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The effects of intergranular sliding on the fracture toughness of nanocrystalline materials with finest grains

Published online by Cambridge University Press:  12 May 2014

Yunbo Wu ,
Jianqiu Zhou ,
Hongxi Liu ,
Xuming Pang ,
Shu Zhang ,
Ying Wang ,
Lu Wang  and
Shuhong Dong
Yunbo Wu
Affiliation:
Department of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
Jianqiu Zhou*
Affiliation:
Department of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China; and Department of Mechanical & Electrical Engineering, Wuhan Institute of Technology, Wuhan, Hubei 430070, China
Hongxi Liu
Affiliation:
Department of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
Xuming Pang
Affiliation:
Department of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
Shu Zhang
Affiliation:
Department of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
Ying Wang
Affiliation:
Department of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
Lu Wang
Affiliation:
Department of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
Shuhong Dong
Affiliation:
Department of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
*
a)Address all correspondence to this author. e-mail: zhouj@njut.edu.cn
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Abstract

A new physical model of plastic deformation in nanocrystalline (NC) materials with finest grains (whose grain size is 2–4 nm) is suggested and theoretically described. The model represents the effect of the finest grains located at triple junctions on the fracture toughness of NC materials in the case that there are multiple dislocations pile-up at grain boundaries (GBs). The maximum number n of the pile-up dislocations is determined by both the capacity of dislocations emitting associated with the crack propagation and the capacity of dislocations pile-up due to the existence of the finest grains. The calculation indicates that the parameter n increases with increment of the grain size and decreases with the finest grain size increasing. The results theoretically reveal that the triple junctions with finest grains can significantly improve the fracture toughness of NC materials compared with the normal triple junctions in wide ranges of their structural parameters.

Keywords

nanocrystalline materialsfinest grainscrack initiationfracture toughness
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 9 , 14 May 2014 , pp. 1086 - 1094
Copyright
Copyright © Materials Research Society 2014 

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