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

doi:10.1016/j.jmst.2020.04.072

Abstract

Abstract:

The effect of nitrogen on microstructural evolution and tensile properties of transformation-induced plasticity (TRIP) Fe₅₀Mn₃₀Co₁₀Cr₁₀ 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.

Key words: High-entropy alloy (HEA), Transformation-induced plasticity (TRIP), Twinning-induced plasticity (TWIP), Strength, Ductility

Yu Han, Huabing Li, Hao Feng, Kemei Li, Yanzhong Tian, Zhouhua Jiang. Simultaneous enhancement in strength and ductility of Fe₅₀Mn₃₀Co₁₀Cr₁₀ high-entropy alloy via nitrogen alloying[J]. J. Mater. Sci. Technol., 2021, 65: 210-215.

Figures/Tables 5

Fig. 1. Variation of weight fraction of phases with temperature for (a) 0 N and (b) 1.15 N HEAs.

Fig. 2. Microstructure of the annealed (a) 0 N and (b) 1.15 N HEAs characterized by ECCI technique. (c) XRD patterns of the annealed 0 N and 1.15 N HEAs.

Fig. 3. (a) Tensile engineering stress-strain curves, (b) tensile true stress-strain curves and (c) strain-hardening rate curves of the 0 N and 1.15 N HEAs. (d) Comparison of yield strength and uniform elongation for the 0 N and 1.15 N HEAs.

Fig. 4. XRD patterns and EBSD phase maps of the (a, b) 0 N and (c, d) 1.15 N HEAs at specified true strain levels (10 % and 30 %) after tensile testing.

Fig. 5. ECCI and TEM images of the 0 N and 1.15 N HEAs at specified true strain levels after tensile testing: (a1, a2) 0 N, ε = 10 %, (b1, b2) 1.15 N, ε = 10 %, (c1, c2) 0 N, ε = 30 %, (d1, d2) 1.15 N, ε = 30 %.

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

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