Tracer Diffusion of Cobalt in High-Entropy Alloys AlxFeNiCoCuCr
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 AlxFeNiCoCuCr (x = 1, 1.5, 1.8) is studied by means of the tracer-diffusion method using the 60Cо 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⋅10−16 to 0.98⋅10−16 m2s−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, 60Cо diffusion coefficient, structure, activation energy, melting temperature.
URL: http://mfint.imp.kiev.ua/en/abstract/v39/i03/0337.html
DOI: https://doi.org/10.15407/mfint.39.03.0337
PACS: 61.66.Dk, 61.72.S-, 65.40.gd, 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 AlxFeNiCoCuCr, Metallofiz. Noveishie Tekhnol., 39, No. 3: 337—348 (2017)