Non-Equilibrium Evolution Thermodynamics Theory

TL;DR

This paper introduces a novel non-equilibrium thermodynamics framework using kinetic equations based on internal and free energy, applied to solids with vacancies and metal strengthening during severe plastic deformation.

Contribution

It presents a new approach to non-equilibrium phenomena in solids, with a kinetic equation formulation and a model for metal strengthening.

Findings

Unified strengthening curves for metals during deformation

Inclusion of Hall-Petch and linear strengthening regimes

Complete statistical model for vacancies in solids

Abstract

Alternative approach for description of the non-equilibrium phenomena arising in solids at a severe external loading is analyzed. The approach is based on the new form of kinetic equations in terms of the internal and modified free energy. It is illustrated by a model example of a solid with vacancies, for which there is a complete statistical ground. The approach is applied to the description of important practical problem - the formation of fine-grained structure of metals during their treatment by methods of severe plastic deformation. In the framework of two-level two-mode effective internal energy potential model the strengthening curves unified for the whole of deformation range and containing the Hall-Petch and linear strengthening sections are calculated.