TY - JOUR
T1 - Anomalous bias factors of dislocations in bcc iron
AU - Chang, Zhongwen
AU - Terentyev, Dmitry
AU - Sandberg, Nils
AU - Samuelsson, K.
AU - Olsson, Pâr
N1 - Score=10
PY - 2015/3/17
Y1 - 2015/3/17
N2 - Dislocation bias factors in bcc Fe have been calculated based on atomistic interaction energy maps on three kinds of dislocations, namely the a0/2h111i{110} screw, a0/2h111i{110} and a0h100i{001} edge dislocations. The results show that the dislocation bias is higher for the a0/2h111i edge dislocation than for the a0h100i edge dislocation, even though the latter possesses a larger Burgers vector. This indicates the importance of the dislocation core contribution. For the a0/2h111i{110} screw dislocation, a negative dislocation bias has been obtained, which implies a more efficient absorption of vacancies than of SIAs. The effect of coexistence of both edge- and screw dislocations are assessed by a total bias. A possible complementary mechanism for explaining the long swelling incubation time in bcc metals is suggested and discussed.
AB - Dislocation bias factors in bcc Fe have been calculated based on atomistic interaction energy maps on three kinds of dislocations, namely the a0/2h111i{110} screw, a0/2h111i{110} and a0h100i{001} edge dislocations. The results show that the dislocation bias is higher for the a0/2h111i edge dislocation than for the a0h100i edge dislocation, even though the latter possesses a larger Burgers vector. This indicates the importance of the dislocation core contribution. For the a0/2h111i{110} screw dislocation, a negative dislocation bias has been obtained, which implies a more efficient absorption of vacancies than of SIAs. The effect of coexistence of both edge- and screw dislocations are assessed by a total bias. A possible complementary mechanism for explaining the long swelling incubation time in bcc metals is suggested and discussed.
KW - bias factors
KW - dislocations
KW - bcc iron
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/26871196
U2 - 10.1016/j.jnucmat.2015.03.025
DO - 10.1016/j.jnucmat.2015.03.025
M3 - Article
VL - 461
SP - 221
EP - 229
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -