Publications

Tracer diffusion in the σ phase of the CoCrFeMnNi system

Zhang, J. and Muralikrishna, G.M. and Asabre, A. and Kalchev, Y. and Müller, J. and Butz, B. and Hilke, S. and Rösner, H. and Laplanche, G. and Divinski, S.V. and Wilde, G.

ACTA MATERIALIA
Volume: 203 Pages:
DOI: 10.1016/j.actamat.2020.116498
Published: 2021

Abstract
A single Cr-rich σ-phase alloy with a composition of Co17Cr46Fe16.3Mn15.2Ni5.5 (at.%) and a tetragonal lattice structure was produced. The tracer diffusion coefficients of Ni and Fe were measured by secondary electron mass spectroscopy using the highly enriched 64Ni and 58Fe natural isotopes. On the homologous temperature scale, Ni and Fe diffuse in the σ phase faster as compared to the corresponding diffusion rates in the equiatomic and face-centered cubic CoCrFeMnNi alloy. In contrast, on the absolute temperature scale, these elements diffuse roughly at the same rates in both materials. Factors influencing element diffusion and phase stability of the σ phase compared to the equiatomic alloy are discussed. © 2020 Acta Materialia Inc.

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