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Excellent combination of cryogenic strength and ductility of a metastable Fe65Ni15Co8Mn8Ti3Si medium entropy alloy through the exceptional deformation-induced martensitic transformation

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Abstract

In the present study, the cryogenic tensile properties of a metastable Fe65Ni15Co8Mn8Ti3Si (at%) medium entropy alloy (MEA) and the impact of the transformation-induced plasticity on the strength-ductility synergy of the corresponding MEA were investigated. Toward this end, the as-annealed specimen with fully face-centered-cubic (FCC) microstructure and the average grain size of 13 μm has been used. The deformation-induced martensitic transformation (DIMT) from the initial FCC phase to the body-centered cubic (bcc) one resulted in an ultra-strength of 1.8 GPa and excellent ductility of 62% through the high strain-hardening rate of ~ 6 GPa which has an excellent combination of mechanical strength and ductility compared to the present literature on HEAs/MEAs. The improved cryogenic tensile properties of the corresponding MEA, in comparison with the present literature, are due to the co-activation of solid solution strengthening, dislocation-mediated plasticity, and the DIMT. Numerical analysis was performed to figure out the strain distribution along the deformed specimen and to correlate it with the martensitic fraction. The present results can expand the possibilities for developing ferrous MEAs/HEAs to overcome the strength and toughness trade-off at cryogenic temperatures.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT of Korea (2021R1A2C3006662). Dr. F. Haftlang is also supported by Brain Pool Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2020H1D3A1A04105882).

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  1. Farahnaz Haftlang and Jihye Kwon have contributed equally to this work.

Authors and Affiliations

  1. Graduate Institute of Ferrous Technology and Energy Materials (GIFT), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Farahnaz Haftlang, Jihye Kwon, Jongun Moon, Peyman Asghari-Rad & Hyoung Seop Kim

  2. Center for High Entropy Alloys, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Farahnaz Haftlang, Jongun Moon, Peyman Asghari-Rad & Hyoung Seop Kim

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  1. Farahnaz Haftlang
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Haftlang, F., Kwon, J., Moon, J. et al. Excellent combination of cryogenic strength and ductility of a metastable Fe65Ni15Co8Mn8Ti3Si medium entropy alloy through the exceptional deformation-induced martensitic transformation. J Mater Sci 57, 18062–18074 (2022). https://doi.org/10.1007/s10853-022-07400-8

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