Continued publication of the materials of the seminar in FTT N 01/22
Mechanical properties, physics of strength and ductility

The mechanism of the anomalous behavior of the plastic flow of materials with high crystal relief caused by the dynamic impurity subsystem

B. V. Petukhov

Institute of Cristallography Russian Academy of Sciences, Moscow

Abstract: A model of dynamic interaction of dislocations with an impurity subsystem of crystals with a high potential relief of the crystal lattice (Peierls barriers) is developed. Such materials include metals with body-centered cubic structure, semiconductors, ceramics, and many others. It is shown that the modification of impurity migration barriers near the dislocation core significantly affects the segregation of impurities on the moving dislocation. The presence of a substantially nonequilibrium initial stage of segregation kinetics leading to anomalies of dislocation dynamics and yield strength of materials is substantiated.

Keywords: dislocation dynamics, segregation of impurities in the dislocation core, synergetics of dislocation and impurity subsystems, stable and unstable regimes, plastic flow anomalies.

Received: 03.07.2021
Revised: 03.07.2021
Accepted: 29.08.2021

DOI: 10.21883/FTT.2021.12.51674.157

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