Strong crack blunting by shear-coupled migration of grain boundaries in nanocrystalline materials

Jianjun Li; Shaohua Chen; Xiaolei Wu; A. K. Soh

doi:10.1016/j.scriptamat.2014.04.020

Strong crack blunting by shear-coupled migration of grain boundaries in nanocrystalline materials

Jianjun Li^*
, Shaohua Chen
, Xiaolei Wu
, A. K. Soh

^*Corresponding author for this work

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

6 Citations (Scopus)

Abstract

A theoretical model is proposed to illustrate the effect of shear-coupled migration of grain boundaries on the emission of lattice dislocations from a semi-infinite crack tip in nanocrystalline materials. The results obtained show that the shear-coupled migration process is able to considerably enhance the capability of the crack to emit dislocations, thus leading to strong crack blunting. Moreover, the combination of grain boundary migration and dislocation emission can serve as an effective toughening mechanism in nanocrystalline materials.

Original language	English
Pages (from-to)	51-54
Number of pages	4
Journal	Scripta Materialia
Volume	84-85
DOIs	https://doi.org/10.1016/j.scriptamat.2014.04.020
Publication status	Published - Aug 2014
Externally published	Yes

Keywords

Cracks
Dislocation emission
Nanocrystalline materials
Shear-coupled migration of grain boundaries
Toughening mechanism

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10.1016/j.scriptamat.2014.04.020

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title = "Strong crack blunting by shear-coupled migration of grain boundaries in nanocrystalline materials",

abstract = "A theoretical model is proposed to illustrate the effect of shear-coupled migration of grain boundaries on the emission of lattice dislocations from a semi-infinite crack tip in nanocrystalline materials. The results obtained show that the shear-coupled migration process is able to considerably enhance the capability of the crack to emit dislocations, thus leading to strong crack blunting. Moreover, the combination of grain boundary migration and dislocation emission can serve as an effective toughening mechanism in nanocrystalline materials.",

keywords = "Cracks, Dislocation emission, Nanocrystalline materials, Shear-coupled migration of grain boundaries, Toughening mechanism",

author = "Jianjun Li and Shaohua Chen and Xiaolei Wu and Soh, \{A. K.\}",

year = "2014",

month = aug,

doi = "10.1016/j.scriptamat.2014.04.020",

language = "English",

volume = "84-85",

pages = "51--54",

journal = "Scripta Materialia",

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TY - JOUR

T1 - Strong crack blunting by shear-coupled migration of grain boundaries in nanocrystalline materials

AU - Li, Jianjun

AU - Chen, Shaohua

AU - Wu, Xiaolei

AU - Soh, A. K.

PY - 2014/8

Y1 - 2014/8

N2 - A theoretical model is proposed to illustrate the effect of shear-coupled migration of grain boundaries on the emission of lattice dislocations from a semi-infinite crack tip in nanocrystalline materials. The results obtained show that the shear-coupled migration process is able to considerably enhance the capability of the crack to emit dislocations, thus leading to strong crack blunting. Moreover, the combination of grain boundary migration and dislocation emission can serve as an effective toughening mechanism in nanocrystalline materials.

AB - A theoretical model is proposed to illustrate the effect of shear-coupled migration of grain boundaries on the emission of lattice dislocations from a semi-infinite crack tip in nanocrystalline materials. The results obtained show that the shear-coupled migration process is able to considerably enhance the capability of the crack to emit dislocations, thus leading to strong crack blunting. Moreover, the combination of grain boundary migration and dislocation emission can serve as an effective toughening mechanism in nanocrystalline materials.

KW - Cracks

KW - Dislocation emission

KW - Nanocrystalline materials

KW - Shear-coupled migration of grain boundaries

KW - Toughening mechanism

UR - https://www.scopus.com/pages/publications/84901745207

U2 - 10.1016/j.scriptamat.2014.04.020

DO - 10.1016/j.scriptamat.2014.04.020

M3 - Article

AN - SCOPUS:84901745207

SN - 1359-6462

VL - 84-85

SP - 51

EP - 54

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Strong crack blunting by shear-coupled migration of grain boundaries in nanocrystalline materials

Abstract

Keywords

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