Strain localization during discontinuous plastic flow at extremely low temperatures

Abstract eng:
The phenomenon of strain localization in the course of discontinuous plastic flow (DPF) at extremely low temperatures is investigated. DPF is observed mainly in fcc metals and alloys strained in cryogenic conditions, practically down to absolute zero. Recent experiments indicate strong strain localization in the form of shear bands propagating along the sample. The Dirac-like temperature response is measured by thermometers located within the gauge length of the sample. Spatio-temporal correlation indicates smooth shear band propagation, as long as the process of phase transformation remains on hold. The model of temperature distribution represented by Green-like solution of heat diffusion equation describes the strain localization effect.

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