Atomistic mechanisms of intermittent plasticity in metals: dislocation avalanches and defect cluster pinning

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Tomoaki Niiyama, Tomotsugu Shimokawa

Abstract

Intermittent plastic deformation in crystals with power-law behaviors has been reported in previous experimental studies. The power-law behavior is reminiscent of self-organized criticality, and mesoscopic models have been proposed that describe this behavior in crystals. In this paper, we show that intermittent plasticity in metals under tensile deformation can be observed in molecular dynamics models, using embedded atom method potentials for Ni, Cu, and Al. Power-law behaviors of stress drop and waiting time of plastic deformation events are observed. It is shown that power-law behavior is due to dislocation avalanche motions in Cu and Ni. A different mechanism of dislocation pinning is found in Al. These different stress relaxation mechanisms give different power-law exponents. We propose a probabilistic model to describe the novel dislocation motion in Al and analytically deduce the power-law behavior.

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Citations

Nov 14, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Daisuke Tsuji, Hiroaki Katsuragi
Sep 19, 2020·Physical Review. E·P ZhangL Truskinovsky

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