Reactive interdiffusion of an Al film and a CoCrFeNi high-entropy alloy

Zaoli Zhang, Sergey V. Ketov, Simon Fellner, Huaping Sheng, Christian Mitterer, K.K. Song, C. Gammer, Jürgen Eckert

Research output: Contribution to journalArticleResearchpeer-review


Diffusion plays a significant role in phase formation and transformation in solid-state alloys. In order to determine the influence of element diffusion on the phase formation and transition behavior in a high-entropy alloy (HEA), a systematic study on the reactive diffusion of Al and a CoCrFeNi HEA was carried out. It is demonstrated that thermodynamic and kinetic effects play a coupled role in the phase evolution in the HEA, among which the thermodynamic effect governs the evolution of major phases. The diffusion direction of the elements is controlled by the Gibbs free energy gradient in front of the interface, while the sluggish diffusion effect does not play a dominant role during reactive diffusion. At an annealing temperature of 773 K, the enthalpy of mixing dominates the total energy and therefore has a significant impact on the phase evolution during reactive diffusion.

Original languageEnglish
Article number110530
Number of pages8
JournalMaterials and Design
Issue numberApril
Publication statusPublished - 10 Mar 2022

Bibliographical note

Publisher Copyright: © 2022 The Authors

Cite this