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Molecular dynamics simulation of screw dislocation interaction with stacking fault tetrahedron in face-centered cubic Cu

Published online by Cambridge University Press:  31 January 2011

Hyon-Jee Lee ,
Jae-Hyeok Shim  and
Brian D. Wirth
Hyon-Jee Lee*
Affiliation:
Nuclear Engineering Department, University of California, Berkeley, California 94720
Jae-Hyeok Shim
Affiliation:
Nuclear Engineering Department, University of California, Berkeley, California 94720; and Materials Science and Technology Research Division, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Brian D. Wirth
Affiliation:
Nuclear Engineering Department, University of California, Berkeley, California 94720
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The interaction of a gliding screw dislocation with stacking fault tetrahedron (SFT) in face-centered cubic (fcc) copper (Cu) was studied using molecular dynamics simulations. Upon intersection, the screw dislocation spontaneously cross slips on the SFT face. One of the cross-slipped Shockley partials glides toward the SFT base, partially absorbing the SFT. At low applied stress, partial absorption produces a superjog, with detachment of the trailing Shockley partial via an Orowan process. This leaves a small perfect SFT and a truncated base behind, which subsequently form a sheared SFT with a pair of opposite sense ledges. At higher applied shear stress, the ledges can self-heal by gliding toward an SFT apex and transform the sheared SFT into a perfect SFT. However, complete absorption or collapse of an SFT (or sheared SFT) by a moving screw dislocation is not observed. These observations provide insights into defect-free channel formation in deformed irradiated Cu.

Keywords

CuDefectsDislocations
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 10 , October 2007 , pp. 2758 - 2769
Copyright
Copyright © Materials Research Society 2007

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