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Tran H.-S.,University of Liege | Tummala H.,Grenoble Institute of Technology | Duchene L.,University of Liege | Peron-Luhrs V.,University of Liege | And 3 more authors.
Proceedings of the 8th International Conference on Computational Plasticity - Fundamentals and Applications, COMPLAS 2015 | Year: 2015

The interaction between lattice dislocations and Coherent Twin Boundary S3 {111} of copper has been studied using Quasi-Continuum method. The coherent twin boundary provides high barrier to slip transmission. The dislocation pile-up modifies the stress field at its intersection with the grain boundary. A different reaction process compared with the case of single dislocations is noticed. One observes the nucleation of a Lomer-type dislocation with Burgers vector of ^ <110 > and its glide on the (100) cube plane in the adjacent grain. This phenomenon has been observed with Transmission Electron Microscopy at room temperature and in other Molecular Dynamics simulations. We also show a novel interaction mechanism between Lomer-type dislocation and Coherent Twin Boundary. This interaction process leaves a dislocation with a Burgers vector coincident with the complete lattice shift of the Coherent Twin Boundary. Quantitative estimation of critical stress for various transmission phenomena is performed by using virial stress. Such information can be used as input for Discrete Dislocation Dynamics models. Source

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