Effect of phase interface atomic coherency on dynamics of dislocations
Source abstract
Abstract
Coarse-grained atomistic simulations are conducted to study the effect of phase interface atomic coherency on the dynamics of dislocations in both metallic and non-metallic multilayers under compression. Results show that the Cu/Ni bimaterial with a coherent interface has a yield point of almost twice higher than the one with a semi-coherent interface. An increased number of semi-coherent interfaces provides richer sources for dislocation nucleation, giving rise to a lower yield point. The intersection of the deposited dislocations is shown as an effective facilitator of dislocation transmission and emission across the semi-coherent interfaces. In contrast to Cu/Ni, the Si/Ge bimaterial with coherent and semi-coherent interfaces exhibit yield strengths of only a 13% discrepancy. The dramatic difference is shown to be determined by the disparate deformation mechanisms of the interface dislocations.
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Research context
OpenAlex topics: Microstructure and mechanical properties · Intermetallics and Advanced Alloy Properties · nanoparticles nucleation surface interactions
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References (45)
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