[en] The interaction between pure screw dislocation with dislocation line directions lying parallel to the twin plane and Coherent Twin Boundary Σ3 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. We introduce a methodology to calculate the stress barriers during slip–GB interaction. Screw dislocation approaching the boundary from one side may either propagate into the adjacent twin grain by cutting through the twin boundary. Quantitative estimation of critical stress for transmission phenomena is performed by using virial stress. The mechanism and critical stress obtained were in line with the literature. Such information can be used as input for Discrete Dislocation Dynamics models
Disciplines :
Materials science & engineering
Author, co-author :
Tran, Hoang Son ; Université de Liège > Département ArGEnCo > Département Argenco : Secteur MS2F
Duchene, Laurent ; Université de Liège > Département ArGEnCo > Analyse multi-échelles des matériaux et struct. du gén. civ.
Habraken, Anne ; Université de Liège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Quasicontinuum analysis of interaction between screw dislocation and coherent twin boundary
Publication date :
07 September 2016
Event name :
15th European Mechanics of Materials Conference
Event organizer :
European Mechanics Society
Event place :
Brussels, Belgium
Event date :
from 7-10-2016 to 9-10-2016
By request :
Yes
Audience :
International
References of the abstract :
The interaction between pure screw dislocation with dislocation line directions lying parallel to the twin plane and Coherent Twin Boundary Σ3 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. We introduce a methodology to calculate the stress barriers during slip–GB interaction. Screw dislocation approaching the boundary from one side may either propagate into the adjacent twin grain by cutting through the twin boundary. Quantitative estimation of critical stress for transmission phenomena is performed by using virial stress. The mechanism and critical stress obtained were in line with the literature. Such information can be used as input for Discrete Dislocation Dynamics models
