Simultaneous enhancement in strength and ductility of Fe₅₀Mn₃₀Co₁₀Cr₁₀ high-entropy alloy via nitrogen alloying

Yu Han¹，Huabing Li^1,2，Hao Feng¹，Kemei Li¹，Yanzhong Tian³，Zhouhua Jiang^1,2

1. School of Metallurgy, Northeastern University2. State Key Laboratory of Rolling and Automation, Northeastern University3. School of Materials Science and Engineering, Northeastern University

摘 要：The effect of nitrogen on microstructural evolution and tensile properties of transformation-induced plasticity（TRIP） Fe50 Mn30 Co10 Cr10 HEAs was investigated. Nitrogen was fully introduced in solid solution by pressure-induced melting technique. Nitrogen addition turned the TRIP alloy to a twinning-induced plasticity（TWIP） alloy, and simultaneously improved the strength and elongation. For the nitrogen-doped HEA, the high yield strength is mainly resulted from the friction stress via interstitial strengthening effect, and the high ductility is originated from retained high strain-hardening capability via the successive onset of dislocation accumulation and deformation twinning. The strain-hardening behavior and microstructural evolution at specified strains were revealed.

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