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“Positive” and “negative” interactions between specified numbers of piled-up lattice dislocations and +Σ11(3¯11¯) and -Σ11(1¯31) symmetrical tilt grain boundaries in two bi-grain models of copper have been studied using the quasi-continuum method. The mechanisms of both interactions in representative loading stages are analyzed in terms of the evolution of grain boundary (GB) configurations and Burgers...
Discrete dislocation dynamics (DD) simulations in conjunction with stereo and in situ straining transmission electronic microscopy (TEM) were used to study dislocation motion in thin Cu foils. Stereo imaging prior to and following in situ tensile straining is utilized to describe the three-dimensional (3D) evolution of dislocation structures with incremental straining and observation by TEM. The initial...
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