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Tracer diffusion in single crystalline CoCrFeNi and CoCrFeMnNi high-entropy alloys: Kinetic hints towards a low-temperature phase instability of the solid-solution?

D. Gaertner, J. Kottke, Y. Chumlyakov, F. Hergemöller, G. Wilde, S. Divinski

Scripta Materialia, 187, 57-62, (2020)

DOI: 10.1016/j.scriptamat.2020.05.060

Download: BibTEX

Tracer-diffusion of constituting elements in single-crystalline CoCrFeNi and CoCrFeMnNi is measured from 923 K to 1373 K. In CoCrFeMnNi, low-temperature deviations from otherwise linear Arrhenius-type dependencies are seen for all elements excluding Mn. The kinks are prominent at about 1100 K for Co and Ni and at 900 K for Cr and Fe indicating the existence of a low-temperature modification of the equiatomic solid-solution phase in CoCrFeMnNi. The temperature-dependent correlation factors of all elements are determined within the framework of the random alloy model providing insights into potential mechanisms of the kinetic anomaly.

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{"type":"article", "name":"d.gaertner202010", "author":"D. Gaertner and J. Kottke and Y. Chumlyakov and F. Hergemöller and G. Wilde and S. Divinski", "title":"Tracer diffusion in single crystalline CoCrFeNi and CoCrFeMnNi highentropy alloys: Kinetic hints towards a lowtemperature phase instability of the solidsolution?", "journal":"Scripta Materialia", "volume":"187", "OPTnumber":"", "OPTmonth":"10", "year":"2020", "OPTpages":"57-62", "OPTnote":"", "OPTkey":"high-entropy alloys; CoCrFeMnNi; diffusion; single-crystals; correlation factors", "DOI":"10.1016/j.scriptamat.2020.05.060"}
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