Recent advances in understanding diffusion in multi-principal element systems

Anuj Dash, Aloke Paul, Sandipan Sen, Sergiy Divinski, Julia Kundin, Ingo Steinbach, Blazej Grabowski, Xi Zhang

Research article (journal)

Abstract

Recent advances in the field of diffusion in multiprincipal element systems are critically reviewed, with an emphasis on experimental as well as theoretical approaches to determining atomic mobilities (tracer diffusion coefficients) in chemically complex multicomponent systems. The newly elaborated and augmented pseudobinary and pseudoternary methods provide a rigorous framework to access tracer, intrinsic, and interdiffusion coefficients in alloys with an arbitrary number of components. Utilization of the novel tracer-interdiffusion couple method allows for a high-throughput determination of composition-dependent tracer diffusion coefficients. A combination of these approaches provides a unique experimental toolbox to access diffusivities of elements that do not have suitable tracers. The pairexchange diffusion model, which gives a consistent definition of diffusion matrices without specifying a reference element, is highlighted. Densityfunctional theory–informed calculations of basic diffusion properties—as required for the generation of extensive mobility databases for technological applications—are also discussed.

Details zur Publikation

Release year: 2022
Language in which the publication is written: English
Link to the full text: https://doi.org/10.1146/annurev-matsci-081720-092213