Interaction between dislocation and coherent twin boundary by quasicontinuum model
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/81236
Tipus de documentComunicació de congrés
Data publicació2015
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
The interaction between lattice dislocations and Coherent Twin Boundary Σ3{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 ½ <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 irial stress. Such information can be used as input for Discrete Dislocation Dynamics models
CitacióTran, H-S. [et al.]. Interaction between dislocation and coherent twin boundary by quasicontinuum model. A: COMPLAS XIII. "COMPLAS XIII : proceedings of the XIII International Conference on Computational Plasticity : fundamentals and applications". CIMNE ed. Barcelona: CIMNE, 2015, p. 992-1002.
ISBN978-84-944244-6-5
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Complas2015_992 ... ON BETWEEN DISLOCATION.pdf | 1,123Mb | Visualitza/Obre |