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Summary: 1
Transmission of a Screw Dislocation
Across a Coherent, Slipping Interface
Yao Shen(a)
and Peter M. Anderson(b)
(a)
School of Materials Science and Engineering, Shanghai Jiao Tong University
800 Dongchuan Road, Shanghai 200240, P.R. China
(b)
Department of Materials Science and Engineering, Ohio State University
2041 College Road, Columbus, OH 43210, USA
Abstract
A Peierls model is used to study the role of interfacial sliding during dislocation
transmission. A straight screw dislocation parallel to a bimaterial interface is considered, with
incoming and outgoing slip planes that are continuous and coplanar. Interfacial sliding is
predicted to increase the critical applied shear crit of interfaces for transmission. A simple
explanation is that sliding delocalizes the dislocation core within the interface, thereby creating a
larger, more abrupt fluctuation in dislocation line energy during transmission. Interfacial sliding
and dislocation trapping are promoted by weak interfacial bonding, which is characterized
primarily by small interfacial unstable stacking fault energy. The results are consistent with
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