# Thermodynamic dislocation theory of high-temperature deformation in aluminum and steel

## TL;DR

This paper applies a thermodynamic dislocation theory to analyze high-temperature deformation in aluminum and steel, successfully fitting experimental data across various conditions and highlighting the significance of thermal softening effects.

## Contribution

It introduces a physics-based, thermodynamic dislocation model that accurately predicts high-temperature deformation behavior in metals, accounting for thermal softening effects.

## Key findings

- The model fits stress-strain curves at multiple strain rates and temperatures.
- Yielding transitions at zero strain are accurately predicted.
- Thermal softening is significant even at low temperatures and strain rates.

## Abstract

The statistical-thermodynamic dislocation theory developed in previous papers is used here in an analysis of high-temperature deformation of aluminum and steel. Using physics-based parameters that we expect theoretically to be independent of strain rate and temperature, we are able to fit experimental stress-strain curves for three different strain rates and three different temperatures for each of these two materials. Our theoretical curves include yielding transitions at zero strain in agreement with experiment. We find that thermal softening effects are important even at the lowest temperatures and smallest strain rates.