Abstract
Using atomistic simulations, several semi-coherent cube-on-cube bimetal interfaces are comparatively investigated to unravel the combined effect of the character of misfit dislocations, the stacking fault energy difference between bimetal pairs, and their lattice mismatch on the dissociation of interfacial misfit dislocations. Different dissociation paths and features under loadings provide several unique deformation mechanisms that are critical for understanding interface strengthening. In particular, applied strains can cause either the formation of global interface coherency by the migration of misfit dislocations from an interface to an adjoining crystal interior or to an alternate packing of stacking faults connected by stair-rod dislocations.
Highlights
Several semi-coherent cube-on-cube bimetal interfaces are comparatively investigated to unravel the combined effect of the character of misfit dislocations, the stacking fault energy difference between bimetal pairs, and their lattice mismatch on the dissociation of interfacial misfit dislocations
Interface misfit dislocation patterns and interface-facilitated deformation mechanisms have garnered considerable interest because they are well known to play a critical role in determining the ultimate strength and ductility of nanoscale metallic composites.[1,2,3,4,5,6,7,8]
These interfaces are composed of closely packed planes of two adjacent metals, which allow the cores of misfit dislocations to preferably dissociate within the interface
Summary
(Received 12 July 2016; accepted 23 October 2016; published online 4 November 2016) Several semi-coherent cube-on-cube bimetal interfaces are comparatively investigated to unravel the combined effect of the character of misfit dislocations, the stacking fault energy difference between bimetal pairs, and their lattice mismatch on the dissociation of interfacial misfit dislocations.
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