Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.actamat.2009.11.033
Title: On intrinsic brittleness and ductility of intergranular fracture along symmetrical tilt grain boundaries in copper
Authors: Cheng, Y.
Jin, Z.-H.
Zhang, Y.W. 
Gao, H.
Keywords: Atomistic simulation
Dislocation
Fracture
Grain boundary
Issue Date: Apr-2010
Source: Cheng, Y., Jin, Z.-H., Zhang, Y.W., Gao, H. (2010-04). On intrinsic brittleness and ductility of intergranular fracture along symmetrical tilt grain boundaries in copper. Acta Materialia 58 (7) : 2293-2299. ScholarBank@NUS Repository. https://doi.org/10.1016/j.actamat.2009.11.033
Abstract: The intrinsic brittleness and ductility of intergranular fracture along a number of symmetrical [1 1 0] tilt grain boundaries (GBs) in Cu are investigated via combined atomistic and continuum studies of dislocation nucleation from an atomically sharp crack tip. In all cases investigated, the classical model of Rice predicts a directional anisotropy in that, along a given GB, brittle cleavage is favored for crack propagation in one direction while dislocation emission from the crack tip is preferred in the opposite direction. This prediction is validated by atomistic simulations of crack propagation along coherent GBs, including Σ 3 (1 over(1, ̄) 1) and Σ 11 (1 over(1, ̄) 3). However, for incoherent GBs such as Σ 9 (2 over(2, ̄) 1), Σ 9 (1 over(1, ̄) 4) and Σ 11 (3 over(3, ̄) 2), such directional anisotropy in intrinsic ductility is not observed; instead, we show that dislocation emission is favored in both crack propagation directions. The reason for this discrepancy is shown to be dislocation emission at a distance ahead of the crack tip along an incoherent GB, which violates the assumption in Rice's model that dislocation emission occurs directly at the crack tip. © 2010.
Source Title: Acta Materialia
URI: http://scholarbank.nus.edu.sg/handle/10635/86604
ISSN: 13596454
DOI: 10.1016/j.actamat.2009.11.033
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