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Meeting

2020 TMS Annual Meeting & Exhibition

Symposium

High Entropy Alloys VIII

Presentation Title

Effect of Solute-solute Interactions on Yield Strength in HEAs

Author(s)

William A. Curtin, Shankha Nag

On-Site Speaker (Planned)

William A. Curtin

Abstract Scope

The strength of HEAs has been theoretically developed for random alloys by considering the interactions of individual solutes with a dislocation, and the collective fluctuations of the random solute field with the dislocation. Such an analysis neglects direct solute-solute interactions, which likely exist because many HEAs are ultimately unstable at moderate temperatures and long times. As a dislocation moves through the random solute field, solute-solute pairs are destroyed and formed. The fluctuations in these processes leads to an additional contribution to the alloy strength, even in the random state. A general statistical analysis of the fluctuations in dislocation energy due to pair-wise solute-solute interactions at different solute-solute distances is presented that is applicable to all concentrations and numbers of components. These fluctuations enter the existing theory in a well-defined manner, enabling assessment of the strengthening as a function of the solute-solute interaction energies. Examples in several systems are shown.

Proceedings Inclusion?

Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume

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