Correlative chemical and structural investigations of accelerated phase evolution in a nanocrystalline high entropy alloy

Li, Y.J. and Kostka, A. and Savan, A. and Ludwig, Al.

Volume: 183 Pages: 122-126
DOI: 10.1016/j.scriptamat.2020.03.016
Published: 2020

Based on our recently-developed combinatorial processing platforms for accelerated investigations of phase evolution in multinary alloys, a novel correlative atom probe tomography and transmission electron microscopy approach is proposed to study phase stability in a nanocrystalline CrMnFeCoNi alloy. We observed that the material can decompose at 250 °C for 5 h or 300 °C for 1 h, having the same decomposed products as in its coarse-grained counterpart after annealing at 500 °C for 500 days. A low apparent activation energy for the diffusion of Ni in the nanocrystalline alloy is derived and explains the fast kinetics of phase decomposition in nanocrystalline alloys. © 2020 Acta Materialia Inc.

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