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- Title
Deformation of Heterogeneous Nanocrystalline Lamella with a Preexisting Crack.
- Authors
Huang, Sixie; Wang, Jian; Zhou, Caizhi
- Abstract
Molecular dynamics simulations were performed on heterogeneous nanocrystalline Al lamellae composed of nanocrystalline (NC) and single-crystalline (SC) layers to study the effect of the heterogeneous microstructures on the propagation of preexisting cracks. Under tensile loading, the heterogeneous NC Al lamella exhibited higher crack growth resistance than the pure NC Al. In addition, a lower volume fraction of the NC layer provided better crack growth resistance in heterogeneous lamellae (HL) samples, which agrees well with previous experiment results. After analyzing the distribution of the atom-level virial stress and microstructure evolution during the deformation, we found that the average stress on grain boundary atoms was much lower in HL samples than that in pure NC sample. When the crack approaches the interface, the heterogeneous microstructure can reduce the stress concentration by emitting dislocations from the interface into the SC layer.
- Subjects
NANOCRYSTALS; ALUMINUM; MICROSTRUCTURE; SURFACE cracks; DEFORMATIONS (Mechanics); MOLECULAR dynamics; CRYSTAL grain boundaries
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2018, Vol 70, Issue 1, p60
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-017-2626-x