In-situ TEM study of crack propagation in crystal thinning area and crystal rotation at crack tip in Al

Yan, Kang; Chen, Zhongwei; Lu, Wenjie; Zhao, Yanni; Le, Wei; Xue, Yanqing; Naseem, Sufyan; Wafaa, Ali

doi:10.1016/j.msea.2021.141800

Cited by 11 publications

(2 citation statements)

References 33 publications

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“…Many types of research have revealed that crack propagation is extremely sensitive to the microstructure among which the grain size and grain boundary characteristic are very important considerations. [ 1–3 ] In general, more refined grain leads to better mechanical property according to Hall–Petch relationship. [ 4 ] Grain boundaries are known to be one of the major barriers to short crack growth.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Grain Boundary Content on Crack Propagation Behavior of Nanocrystalline Al by Molecular Dynamics Simulation

Dong

Zhou

et al. 2022

Physica Status Solidi (b)

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The nanocrystalline metal material has been an investigation hotspot due to its excellent mechanical property. The high content of grain boundaries (GBs) in microstructure is the key factor affecting its fracture behavior during service. Therefore, it is essential to investigate the effect mechanism of nanoscale GB on crack propagation. In this study, four molecular dynamics (MD) models of nanocrystalline aluminum (Al) with different GB contents are established. The results show that the high‐content GBs in polycrystals can increase the toughness and absorb energy, reducing the risk of brittle crack propagation. The presence of GB can reduce the stress concentration of the crack, and the dislocation emission from the crack tip can be absorbed by the front GB. The microstructure with high‐content GBs can actuate more plastic deformation mechanisms such as multiple slips, GB slip, and migration. The region with more GBs can induce a more even deformation of the whole microstructure by means of dislocation emission and GB migration to the region with fewer GBs. The purpose of this study is to provide a rational mechanism reference for the failure of nanocrystalline metal material.

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Section: Introductionmentioning

confidence: 99%

Investigation of Grain Boundary Content on Crack Propagation Behavior of Nanocrystalline Al by Molecular Dynamics Simulation

Dong

Zhou

et al. 2022

Physica Status Solidi (b)

View full text Add to dashboard Cite

show abstract

“…In addition, the size of dislocation sources (e.g. the Frank-Read sources) is approximately 100 nm [28,29], which is close to the specimen size of nanomaterials, suggesting lack of dislocation sources in the nano-scaled specimen. This condition is also essentially different from the case of a bulk metal containing plenty of dislocations and dislocation sources.…”

Section: Introductionmentioning

confidence: 75%

Defect formation mechanisms in metal nanowire under cyclic loading: a molecular dynamics study

Kubo

Kawai

Sumigawa

et al. 2023

Modelling Simul. Mater. Sci. Eng.

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A series of molecular dynamics simulations were conducted to reveal the fatigue mechanisms in metal nanowires. We applied axial cyclic loading deformation on a copper single-crystal nanowire model and observed the deformation process during cycle evolution. The detailed observation revealed that the deformation mechanisms in the nanowire is essentially diﬀerent from the case of the macro- and micro-scaled materials because of the lack of dislocation sources. We also found that atomic vacancies were formed continually by dislocation motion even under a simple single-slip condition. The accumulation of vacancies is expected to be a probable mechanism of fatigue in nanomaterials.

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Atomistic simulation for initiation of crystal slip deformation from surface of nanoscale copper single-crystal nanowires

Kawai

Kubo

Umeno

2023

Computational Materials Science

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In-situ TEM study of crack propagation in crystal thinning area and crystal rotation at crack tip in Al

Cited by 11 publications

References 33 publications

Investigation of Grain Boundary Content on Crack Propagation Behavior of Nanocrystalline Al by Molecular Dynamics Simulation

Investigation of Grain Boundary Content on Crack Propagation Behavior of Nanocrystalline Al by Molecular Dynamics Simulation

Defect formation mechanisms in metal nanowire under cyclic loading: a molecular dynamics study

Atomistic simulation for initiation of crystal slip deformation from surface of nanoscale copper single-crystal nanowires

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