[en] methodAbstract.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 onthe (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 interactionprocess 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
Disciplines :
Materials science & engineering
Author, co-author :
Hoang, Son Tran; Université de Liège - ULiège > ArGENCO > MSM
Tummala, Hareesh; simap.grenoble-inp France
Duchene, Laurent ; Université de Liège > Département ArGEnCo > Analyse multi-échelles des matériaux et struct. du gén. civ.
Péron Luhrs, Vincent; Université de Liège - ULiège > A&M > de L Noels
Fivel, Marc; grenoble-inp France
Habraken, Anne ; Université de Liège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Interaction between dislocation and coherent twin boundary by quasicontinuum model
Publication date :
02 September 2015
Event name :
XIII International Conference on Computational Plasticity. Fundamentals and Applications COMPLAS XIII E
Event organizer :
E. Oñate, D.R.J. Owen, D. Peric and M. Chiumenti
Event place :
Barcelona, Spain
Event date :
1-3 Septembre 2015
By request :
Yes
Audience :
International
Main work title :
Proceedings of XIII International Conference on Computational Plasticity. Fundamentals and Applications COMPLAS ebook open accesss XIII
Peer reviewed :
Peer reviewed
Name of the research project :
PAI P7/21 INTEMATE
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
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