Crack nucleation due to dislocation pile-ups at twin boundary-grain boundary intersections

Shu Zhang; Jianqiu Zhou; Lu Wang; Hongxi Liu; Shuhong Dong

doi:10.1016/j.msea.2015.02.048

Crack nucleation due to dislocation pile-ups at twin boundary-grain boundary intersections

Shu Zhang, Jianqiu Zhou, Lu Wang, Hongxi Liu, Shuhong Dong

School of energy science and engineering

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

According to the mechanism of wedge crack nucleation at twin boundary-grain boundary intersections, a corresponding model was built to analyze the nucleation of crack quantitatively. The results showed that crack nucleation was easier for a higher applied stress or an increasing twin lamellae thickness. For different boundary orientation, the resolved shear stress on boundary was different, which led to the variations of the energy of pile-up dislocations and the energy of crack nucleation. Thus, boundary orientation also had a significant influence on crack nucleation. Moreover, decreasing grain size resulted in a smaller critical twin lamellae thickness for crack nucleation.

Original language	English
Pages (from-to)	78-81
Number of pages	4
Journal	Materials Science and Engineering: A
Volume	632
DOIs	https://doi.org/10.1016/j.msea.2015.02.048
State	Published - 4 Apr 2015

Keywords

Crack nucleation
Dislocation pile-ups
Nanotwinned materials
Twin boundary-grain boundary intersection

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10.1016/j.msea.2015.02.048

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title = "Crack nucleation due to dislocation pile-ups at twin boundary-grain boundary intersections",

abstract = "According to the mechanism of wedge crack nucleation at twin boundary-grain boundary intersections, a corresponding model was built to analyze the nucleation of crack quantitatively. The results showed that crack nucleation was easier for a higher applied stress or an increasing twin lamellae thickness. For different boundary orientation, the resolved shear stress on boundary was different, which led to the variations of the energy of pile-up dislocations and the energy of crack nucleation. Thus, boundary orientation also had a significant influence on crack nucleation. Moreover, decreasing grain size resulted in a smaller critical twin lamellae thickness for crack nucleation.",

keywords = "Crack nucleation, Dislocation pile-ups, Nanotwinned materials, Twin boundary-grain boundary intersection",

author = "Shu Zhang and Jianqiu Zhou and Lu Wang and Hongxi Liu and Shuhong Dong",

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doi = "10.1016/j.msea.2015.02.048",

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T1 - Crack nucleation due to dislocation pile-ups at twin boundary-grain boundary intersections

AU - Zhang, Shu

AU - Zhou, Jianqiu

AU - Wang, Lu

AU - Liu, Hongxi

AU - Dong, Shuhong

PY - 2015/4/4

Y1 - 2015/4/4

N2 - According to the mechanism of wedge crack nucleation at twin boundary-grain boundary intersections, a corresponding model was built to analyze the nucleation of crack quantitatively. The results showed that crack nucleation was easier for a higher applied stress or an increasing twin lamellae thickness. For different boundary orientation, the resolved shear stress on boundary was different, which led to the variations of the energy of pile-up dislocations and the energy of crack nucleation. Thus, boundary orientation also had a significant influence on crack nucleation. Moreover, decreasing grain size resulted in a smaller critical twin lamellae thickness for crack nucleation.

AB - According to the mechanism of wedge crack nucleation at twin boundary-grain boundary intersections, a corresponding model was built to analyze the nucleation of crack quantitatively. The results showed that crack nucleation was easier for a higher applied stress or an increasing twin lamellae thickness. For different boundary orientation, the resolved shear stress on boundary was different, which led to the variations of the energy of pile-up dislocations and the energy of crack nucleation. Thus, boundary orientation also had a significant influence on crack nucleation. Moreover, decreasing grain size resulted in a smaller critical twin lamellae thickness for crack nucleation.

KW - Crack nucleation

KW - Dislocation pile-ups

KW - Nanotwinned materials

KW - Twin boundary-grain boundary intersection

UR - http://www.scopus.com/inward/record.url?scp=84924698838&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2015.02.048

DO - 10.1016/j.msea.2015.02.048

M3 - 文章

AN - SCOPUS:84924698838

SN - 0921-5093

VL - 632

SP - 78

EP - 81

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Crack nucleation due to dislocation pile-ups at twin boundary-grain boundary intersections

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Keywords

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