Anomalous dislocation multiplication in FCC metals.
Direct atomistic simulations of dislocation multiplication in fcc aluminum reveal an unexpected mechanism, in which a Frank-Read source emits dislocations with Burgers vectors different from that of the source itself. The mechanism is traced to a spontaneous nucleation of partial dislocation loops within the stacking fault. Understanding and a quantitative description of this unusual process are achieved through the development of a continuum model for dislocation nucleation based on the coarse-grained dislocation dynamics approach and a minimal amount of atomistic input.
de Koning
Maurice
M
Lawrence Livermore National Laboratory, P.O. Box 808, L-371, Livermore, California 94550, USA.
Cai
Wei
W
Bulatov
Vasily V
VV