TY - JOUR
T1 - Blunting of a brittle crack at grain boundaries: An atomistic study in BCC Iron
AU - Terentyev, Dmitry
AU - Gao, F.
A2 - Bonny, Giovanni
N1 - Score = 10
PY - 2013/8
Y1 - 2013/8
N2 - We investigated the interaction of a brittle crack with low and high angle grain boundaries in BCC Iron by means of atomistic simulations at finite temperatures. It is demonstrated that both low and high angle grain boundaries exhibit resistance to brittle crack propagation. The resistance is controlled by the ability of a grain boundary interface to structurally transform, which can involve grain boundary sliding or the emission of misfit dislocations. Here, we observed deformation mechanisms which generally correspond to those reported in experiments for Fe–Si polycrystals. We show that low and high angle grain boundaries exhibit different intensities of plastic deformation upon interaction with a brittle crack, thereby offering different resistance to its propagation.
AB - We investigated the interaction of a brittle crack with low and high angle grain boundaries in BCC Iron by means of atomistic simulations at finite temperatures. It is demonstrated that both low and high angle grain boundaries exhibit resistance to brittle crack propagation. The resistance is controlled by the ability of a grain boundary interface to structurally transform, which can involve grain boundary sliding or the emission of misfit dislocations. Here, we observed deformation mechanisms which generally correspond to those reported in experiments for Fe–Si polycrystals. We show that low and high angle grain boundaries exhibit different intensities of plastic deformation upon interaction with a brittle crack, thereby offering different resistance to its propagation.
KW - Metal
KW - Crack
KW - Grain boundary
KW - Fracture
KW - Twinning deformation
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_136504
UR - http://knowledgecentre.sckcen.be/so2/bibref/11744
U2 - 10.1016//j.msea.2013.04.012
DO - 10.1016//j.msea.2013.04.012
M3 - Article
SN - 0921-5093
VL - 576
SP - 231
EP - 238
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
ER -