On the role of weak interface in crack blunting process in nanoscale layered composites

Yi Li; Qing Zhou; Shuang Zhang; Ping Huang; Kewei Xu; Fei Wang; Tianjian Lu

doi:10.1016/j.apsusc.2017.10.002

On the role of weak interface in crack blunting process in nanoscale layered composites

Yi Li, Qing Zhou, Shuang Zhang, Ping Huang, Kewei Xu, Fei Wang, Tianjian Lu

Xi'an Jiaotong University

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

26 Scopus citations

Abstract

Heterointerface in a nanoscale metallic layered composite could improve its crack resistance. However, the influence of metallic interface structures on crack propagation has not been well understood at atomic scale. By using the method of molecular dynamics (MD) simulation, the crack propagation behavior in Cu-Nb bilayer is compared with that in Cu-Ni bilayer. We find that the weak Cu-Nb interface plays an important role in hindering crack propagation in two ways: (i) dislocation nucleation at the interface releases stress concentration for the crack to propagate; (ii) the easily sheared weak incoherent interface blunts the crack tip. The results are helpful for understanding the interface structure dependent crack resistance of nanoscale bicrystal interfaces.

Original language	English
Pages (from-to)	957-962
Number of pages	6
Journal	Applied Surface Science
Volume	433
DOIs	https://doi.org/10.1016/j.apsusc.2017.10.002
State	Published - 1 Mar 2018
Externally published	Yes

Keywords

Crack
Dislocation
Interface
Molecular dynamics

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10.1016/j.apsusc.2017.10.002

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title = "On the role of weak interface in crack blunting process in nanoscale layered composites",

abstract = "Heterointerface in a nanoscale metallic layered composite could improve its crack resistance. However, the influence of metallic interface structures on crack propagation has not been well understood at atomic scale. By using the method of molecular dynamics (MD) simulation, the crack propagation behavior in Cu-Nb bilayer is compared with that in Cu-Ni bilayer. We find that the weak Cu-Nb interface plays an important role in hindering crack propagation in two ways: (i) dislocation nucleation at the interface releases stress concentration for the crack to propagate; (ii) the easily sheared weak incoherent interface blunts the crack tip. The results are helpful for understanding the interface structure dependent crack resistance of nanoscale bicrystal interfaces.",

keywords = "Crack, Dislocation, Interface, Molecular dynamics",

author = "Yi Li and Qing Zhou and Shuang Zhang and Ping Huang and Kewei Xu and Fei Wang and Tianjian Lu",

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doi = "10.1016/j.apsusc.2017.10.002",

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T1 - On the role of weak interface in crack blunting process in nanoscale layered composites

AU - Li, Yi

AU - Zhou, Qing

AU - Zhang, Shuang

AU - Huang, Ping

AU - Xu, Kewei

AU - Wang, Fei

AU - Lu, Tianjian

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Heterointerface in a nanoscale metallic layered composite could improve its crack resistance. However, the influence of metallic interface structures on crack propagation has not been well understood at atomic scale. By using the method of molecular dynamics (MD) simulation, the crack propagation behavior in Cu-Nb bilayer is compared with that in Cu-Ni bilayer. We find that the weak Cu-Nb interface plays an important role in hindering crack propagation in two ways: (i) dislocation nucleation at the interface releases stress concentration for the crack to propagate; (ii) the easily sheared weak incoherent interface blunts the crack tip. The results are helpful for understanding the interface structure dependent crack resistance of nanoscale bicrystal interfaces.

AB - Heterointerface in a nanoscale metallic layered composite could improve its crack resistance. However, the influence of metallic interface structures on crack propagation has not been well understood at atomic scale. By using the method of molecular dynamics (MD) simulation, the crack propagation behavior in Cu-Nb bilayer is compared with that in Cu-Ni bilayer. We find that the weak Cu-Nb interface plays an important role in hindering crack propagation in two ways: (i) dislocation nucleation at the interface releases stress concentration for the crack to propagate; (ii) the easily sheared weak incoherent interface blunts the crack tip. The results are helpful for understanding the interface structure dependent crack resistance of nanoscale bicrystal interfaces.

KW - Crack

KW - Dislocation

KW - Interface

KW - Molecular dynamics

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DO - 10.1016/j.apsusc.2017.10.002

M3 - 文章

AN - SCOPUS:85032006100

SN - 0169-4332

VL - 433

SP - 957

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JO - Applied Surface Science

JF - Applied Surface Science

ER -

On the role of weak interface in crack blunting process in nanoscale layered composites

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Keywords

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