Abstract
The ageing hardening mechanism of a newly designed Fe–Cr-based Fe65Cr13Cu3(CoMnMoNiAlTi)19 medium-entropy stainless alloy (ME-SA) with a simple bcc solid solution matrix was studied. This kind of ME-SA possessed a higher ageing hardness of approximately 584 HV and higher compressive stress and corrosion resistance than those of the conventional precipitation hardening stainless steel 17-4PH (Cr17Ni4Cu4Nb), which has comparable compressive strain. The well-dispersed B2-ordered phase in the cast state transformed to a D03 crystal structure with a higher ordering degree and reduced the precipitate size after ageing at 500 °C, thus promoting a great ageing hardening effect.
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Acknowledgements
This work is financially supported by the National Natural Science Foundation of China (Nos. 51971001, 52005007, and U1560105), and the Natural Science Foundation of Anhui Province (No. 2008085ME125)
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Xu, BQ., Zhang, H., Ma, D. et al. Ageing Hardening Mechanism and Corrosion Resistance in the Fe65Cr13Cu3(CoMnMoNiAlTi)19 Medium-Entropy Stainless Alloy. Acta Metall. Sin. (Engl. Lett.) 34, 1601–1608 (2021). https://doi.org/10.1007/s40195-021-01288-0
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DOI: https://doi.org/10.1007/s40195-021-01288-0