Impact of interstitial carbon on self-diffusion in CoCrFeMnNi high entropy alloys

• DOI: 10.1016/j.scriptamat.2020.07.044
• Publication Date: 2020-07-31T17:15:39Z
• Authors: O.A. Lukianova; Z. Rao; V. Kulitckii; Z. Li; G. Wilde; S.V. Divinski
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract Tracer diffusion of the matrix elements in CoCrFeNiMn-based high-entropy alloys with 0.2, 0.5 and 0.8 at.% carbon is measured at 1373 K. The diffusion coefficients are found to depend non-monotonously on the carbon content. The diffusion retardation in low-C alloys is discussed in terms of the impact of interstitially-dissolved carbon on the vacancy concentration and the migration barriers in the alloy. In high-C alloys, formation of carbides alternates the observed trends, most probably by increasing the total vacancy concentration.