Markov Property of Continuous Dislocation Band Propagation

TL;DR

This paper investigates the dynamics of dislocation band propagation during the PLC effect in Al-Mg alloy, revealing that type A band movement follows a Markov process based on experimental stress data analysis.

Contribution

It demonstrates that the propagation of type A dislocation bands during the PLC effect can be modeled as a Markov process, providing new insights into dislocation dynamics.

Findings

Dislocation band propagation is of type A during PLC effect

Stress time series data exhibit Markovian properties

Experimental evidence supports Markov process modeling

Abstract

Tensile tests were carried out by deforming polycrystalline samples of substitutional Al-2.5%Mg alloy at room temperature for a range of strain rates. The Portevin-Le Chatelier (PLC) effect was observed throughout the strain rate regime. The deformation bands in this region are found to be of type A in nature. From the analysis of the experimental stress time series data we could infer that the dynamics of type A dislocation band propagation is a Markov process.