Invited Lecture
Application of a new random alloy kinetic formalism to high entropy alloys

High Entropy Alloys (HEAs) have been of significant interest recently due to their potentially superior mechanical and other physical properties. In turn, those properties are dependent on the individual diffusivities of the constituent atoms (tracer or self-diffusion functions) and on the collective diffusion properties (interdiffusion and intrinsic diffusion functions) of the HEAs. In this talk, we describe a new ‘light’ version of the near-exact Moleko, Allnatt and Allnatt random alloy kinetic formalism in order to analyse the concentration dependence of the diffusivities in multicomponent alloys. The formalism allows extraction of the self-diffusivities from the interdiffusion functions. Application to the experimental interdiffusion data [1] available for one HEA, namely Co-Cr-Fe-Mn-Ni, via quasi-binary diffusion couples is made.

[1] Tsai KY, Tsai M.H., Yeh J.W. (2013) Acta Mater 61, 4887-4897.