Correlation of microdistortions with misfit volumes in High Entropy Alloys

TL;DR

This paper demonstrates that atomic-scale microdistortions in High Entropy Alloys are nearly proportional to misfit volumes, linking microscopic distortions to macroscopic yield strength through a predictive model.

Contribution

It establishes a nearly proportional relationship between microdistortions and misfit volumes in High Entropy Alloys, connecting microscopic distortions to yield strength predictions.

Findings

Microdistortions correlate with misfit volumes across alloy compositions.

The correlation holds for both FCC and BCC alloy families.

Yield strength is linked to microdistortions via the misfit parameter.

Abstract

The yield strengths of High Entropy Alloys have recently been correlated with measured picometer-scale atomic distortions. Here, the root mean square microdistortion in a multicomponent alloy is shown to be nearly proportional to the misfit-volume parameter that enters into a predictive model of solute strengthening. Analysis of two model ternary alloy families, face-centered cubic Cr-Fe-Ni and body-centered cubic Nb-Mo-V, demonstrates the correlation over a wide composition space. The reported correlation of yield strength with microdistortion is thus a consequence of the correlation between microdistortion and misfit parameter and the derived dependence of yield strength on the misfit parameter.