Significantly enhanced crack blunting by nanograin rotation in nanocrystalline materials

Jianjun Li; Shaohua Chen; George J. Weng

doi:10.1016/j.scriptamat.2018.03.030

Significantly enhanced crack blunting by nanograin rotation in nanocrystalline materials

Jianjun Li^*
, Shaohua Chen
, George J. Weng

^*Corresponding author for this work

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

5 Citations (Scopus)

Abstract

Experiments have shown that stress-driven grain growth is closely related to the enhanced crack growth resistance and the exceptional tensile ductility as observed in several nano-metals. However, the quantitative correlation remains unsolved. Here we developed a theoretical model to investigate the effect of nanograin rotation, one of the main modes of stress-driven grain growth, on dislocation emission from the tip of a semi-infinite crack in a nanograined solid. Our findings show that the nanograin rotation can significantly enhance the capability of the crack to emit dislocations, thus leading to strong crack blunting in nanomaterials.

Original language	English
Pages (from-to)	19-23
Number of pages	5
Journal	Scripta Materialia
Volume	151
DOIs	https://doi.org/10.1016/j.scriptamat.2018.03.030
Publication status	Published - 1 Jul 2018
Externally published	Yes

Keywords

Crack blunting
Dislocation emission
Nanocrystalline materials
Nanograin rotation
Toughening

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10.1016/j.scriptamat.2018.03.030

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@article{21b75cacce41447aa05c6b496f1f317f,

title = "Significantly enhanced crack blunting by nanograin rotation in nanocrystalline materials",

abstract = "Experiments have shown that stress-driven grain growth is closely related to the enhanced crack growth resistance and the exceptional tensile ductility as observed in several nano-metals. However, the quantitative correlation remains unsolved. Here we developed a theoretical model to investigate the effect of nanograin rotation, one of the main modes of stress-driven grain growth, on dislocation emission from the tip of a semi-infinite crack in a nanograined solid. Our findings show that the nanograin rotation can significantly enhance the capability of the crack to emit dislocations, thus leading to strong crack blunting in nanomaterials.",

keywords = "Crack blunting, Dislocation emission, Nanocrystalline materials, Nanograin rotation, Toughening",

author = "Jianjun Li and Shaohua Chen and Weng, \{George J.\}",

note = "Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

year = "2018",

month = jul,

day = "1",

doi = "10.1016/j.scriptamat.2018.03.030",

language = "English",

volume = "151",

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journal = "Scripta Materialia",

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TY - JOUR

T1 - Significantly enhanced crack blunting by nanograin rotation in nanocrystalline materials

AU - Li, Jianjun

AU - Chen, Shaohua

AU - Weng, George J.

PY - 2018/7/1

Y1 - 2018/7/1

N2 - Experiments have shown that stress-driven grain growth is closely related to the enhanced crack growth resistance and the exceptional tensile ductility as observed in several nano-metals. However, the quantitative correlation remains unsolved. Here we developed a theoretical model to investigate the effect of nanograin rotation, one of the main modes of stress-driven grain growth, on dislocation emission from the tip of a semi-infinite crack in a nanograined solid. Our findings show that the nanograin rotation can significantly enhance the capability of the crack to emit dislocations, thus leading to strong crack blunting in nanomaterials.

AB - Experiments have shown that stress-driven grain growth is closely related to the enhanced crack growth resistance and the exceptional tensile ductility as observed in several nano-metals. However, the quantitative correlation remains unsolved. Here we developed a theoretical model to investigate the effect of nanograin rotation, one of the main modes of stress-driven grain growth, on dislocation emission from the tip of a semi-infinite crack in a nanograined solid. Our findings show that the nanograin rotation can significantly enhance the capability of the crack to emit dislocations, thus leading to strong crack blunting in nanomaterials.

KW - Crack blunting

KW - Dislocation emission

KW - Nanocrystalline materials

KW - Nanograin rotation

KW - Toughening

UR - https://www.scopus.com/pages/publications/85044571685

U2 - 10.1016/j.scriptamat.2018.03.030

DO - 10.1016/j.scriptamat.2018.03.030

M3 - Article

AN - SCOPUS:85044571685

SN - 1359-6462

VL - 151

SP - 19

EP - 23

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Significantly enhanced crack blunting by nanograin rotation in nanocrystalline materials

Abstract

Keywords

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