Martensitic transformation in CrCoNi medium-entropy alloy at cryogenic temperature

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Abstract

We investigated the in situ deformation behavior of the CrCoNi medium-entropy alloy at a cryogenic temperature of 140K and compared it with deformation at room temperature. The sample exhibited higher strength and larger ductility at the cryogenic temperature. The CrCoNi alloy remained single-phase face-centered cubic at room temperature, while deformation at 140K resulted in a martensitic transformation to the hexagonal close-packed structure. The phase transformation, an additional deformation mechanism to stacking faults, twinning, and dislocation slip, resulted in a higher work hardening at cryogenic temperature. The study addresses the structure metastability in the CrCoNi alloy, which led to the formation of epsilon-martensite from the intrinsic stacking faults.

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Naeem, M., Zhou, H., He, H., Harjo, S., Kawasaki, T., Lan, S., … Wang, X. L. (2021). Martensitic transformation in CrCoNi medium-entropy alloy at cryogenic temperature. Applied Physics Letters, 119(13), 1ENG. https://doi.org/10.1063/5.0067268

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