Tracer Diffusion of Cobalt in High-Entropy Alloys Al$_{x}$FeNiCoCuCr

V. M. Nadutov, V. F. Mazanko, S. Yu. Makarenko

G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03680 Kyiv-142, Ukraine

Received: 16.12.2017. Download: PDF

The Co diffusion in the as-cast high-entropy alloys Al$_{x}$FeNiCoCuCr ($x$ = 1, 1.5, 1.8) is studied by means of the tracer-diffusion method using the $^{60}$Cо isotope. As shown, the Co diffusion in the high-entropy alloys occurs by means of the vacancy mechanism and the diffusion coefficient decreases approximately in three times (from 3.21$\cdot$10$^{-16}$ to 0.98$\cdot$10$^{-16}$ m$^{2}$s$^{-1}$) with the increasing Al concentration. The decelerated Co diffusion is explained in terms of relatively large and negative enthalpy of mixing.

Key words: high-entropy alloys, $^{60}$Cо diffusion coefficient, structure, activation energy, melting temperature.



PACS: 61.66.Dk, 61.72.S-,, 66.30.Fq, 66.30.J-, 68.37.Hk, 81.70.Pg

Citation: V. M. Nadutov, V. F. Mazanko, and S. Yu. Makarenko, Tracer Diffusion of Cobalt in High-Entropy Alloys Al$_{x}$FeNiCoCuCr, Metallofiz. Noveishie Tekhnol., 39, No. 3: 337—348 (2017)

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