Relaxation of Misfit Dislocations at Nodes

Abstract:

Experimental studies proved that structures and properties of misfit dislocations and their intersections (nodes) in semi-coherent interfaces strongly affect thermal and mechanical stability of interface. Employing atomistic simulations, we reveal that misfit dislocation lines can exhibit a spiral pattern (SP) or remain straight in association with dislocation character at nodes. By analyzing nodes formation processes in terms of kinetics and energetics, we found that the variation is ascribed to the competition between core energy of misfit dislocation and interface stacking fault energy with respect to coherent interface.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 515-520
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.515
• Online since: May 2014
• Authors: Shuai Shao, Jian Wang*, Amit Misra, Richard G. Hoagland
• Keywords: Atomistic Simulation, Dislocation, Face-Centered-Cubic Crystals, Interface, Nodes

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