TY - JOUR
T1 - Energetics of residual dislocations associated with slip-twin and slip-GBs interactions
AU - Sangid, Michael D.
AU - Ezaz, Tawhid
AU - Sehitoglu, Huseyin
N1 - Funding Information:
We note that the authors MDS and TE contributed equally in writing this paper. Support for this work was provided primarily by the National Science Foundation , Virginia, USA, Division of Materials Research, through Grant Number DMR 08-03270 . Work of MDS was partially funded by Rolls-Royce Corporation . The authors gratefully acknowledge the use of the parallel computing resource as part of the Turing cluster maintained and operated by the Computational Science and Engineering Program at the University of Illinois.
PY - 2012/4/30
Y1 - 2012/4/30
N2 - During direct slip transmission of a dislocation through a twin or grain boundary, typically a residual dislocation remains in the boundary plane. Through atomistic simulations, we show systematic cases of slip transmission through various types of 〈1. 1. 0〉 tilts and 〈1. 1. 1〉 twists grain boundaries (GBs). Additionally, one specific type of GB, the coherent twin boundary (CTB), is viewed to investigate the effects of orientation and dislocation type on the slip transmission process. In every case, we measure the residual Burgers vector within the boundary and energy barrier for slip to transmit through the CTB or GB. There exists a direct correlation between the magnitude of the residual Burgers vector and the energy barrier for slip transmission. Hence, in cases of easy slip transmission (i.e. low energy barrier), a small residual dislocation is left in the GB; meanwhile in cases where it is difficult for slip to transmit past the CTB or GB (i.e. high energy barrier), a large residual Burgers vector remains within the boundary.
AB - During direct slip transmission of a dislocation through a twin or grain boundary, typically a residual dislocation remains in the boundary plane. Through atomistic simulations, we show systematic cases of slip transmission through various types of 〈1. 1. 0〉 tilts and 〈1. 1. 1〉 twists grain boundaries (GBs). Additionally, one specific type of GB, the coherent twin boundary (CTB), is viewed to investigate the effects of orientation and dislocation type on the slip transmission process. In every case, we measure the residual Burgers vector within the boundary and energy barrier for slip to transmit through the CTB or GB. There exists a direct correlation between the magnitude of the residual Burgers vector and the energy barrier for slip transmission. Hence, in cases of easy slip transmission (i.e. low energy barrier), a small residual dislocation is left in the GB; meanwhile in cases where it is difficult for slip to transmit past the CTB or GB (i.e. high energy barrier), a large residual Burgers vector remains within the boundary.
KW - Dislocation
KW - Grain boundaries (GB)
KW - Grain boundary energy
KW - Molecular dynamics simulations (MD simulations)
KW - Residual Burgers vectors
KW - Twins
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U2 - 10.1016/j.msea.2012.02.023
DO - 10.1016/j.msea.2012.02.023
M3 - Article
AN - SCOPUS:84858441572
VL - 542
SP - 21
EP - 30
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -