Novel Co-free high performance TRIP and TWIP medium-entropy alloys at cryogenic temperatures

doi:10.1016/j.jmst.2020.05.010

Abstract

Abstract:

Recently, high- and medium-entropy alloys (HEAs and MEAs) have been found to exhibit excellent cryogenic mechanical properties, but most of them contain high-priced Co element. Therefore, developing HEAs or MEAs with high strength and ductility and relatively low cost is urgent. In this work, novel Co-free Fe_xMn_75-_xNi₁₀Cr₁₅ (x = 50 and 55 at.%) MEAs were developed, which exhibit a good combination of low cost, high strength and ductility at cryogenic temperature. It was found that the Fe₅₀Mn₂₅Ni₁₀Cr₁₅ MEA exhibits a combination of cryogenic tensile strength of ～ 0.98 GPa and ductility of ～ 83 %. The excellent cryogenic mechanical properties were attributed to joint of twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) effects. The present study sheds light on developing low cost MEAs with high performance for cryogenic-temperature applications.

Key words: Medium-entropy alloys (MEAs), Transformation-induced plasticity (TRIP), Twinning induced plasticity (TWIP), Mechanical properties, Cryogenic temperature

Ran Wei, Kaisheng Zhang, Liangbin Chen, Zhenhua Han, Tan Wang, Chen Chen, Jianzhong Jiang, Tingwei Hu, Fushan Li. Novel Co-free high performance TRIP and TWIP medium-entropy alloys at cryogenic temperatures[J]. J. Mater. Sci. Technol., 2020, 57: 153-158.

Figures/Tables 8

Fig. 1. XRD patterns of the Fe50 and Fe55 MEAs plates.

Fig. 2. EBSD inverse pole figure (IPF) and phase maps of the Fe50 MEA (a1, a2) and Fe55 MEA (b1, b2) before tensile deformation. The yellow points in (a2) should be unresolved regions.

Fig. 3. (a) Engineering stress-strain curves at 293 K and 77 K and (b) the corresponding true stress-strain and strain hardening rate-strain curves at 77 K for Fe50 and Fe55 MEAs.

Fig. 4. SEM images of fracture surfaces of Fe50 MEA at 293 K (a, b) and 77 K (c, d) at low and high magnifications.

Fig. 5. EBSD IPF maps and phase maps of Fe50 MEA after tensile fracture at 293 K (a1, a2) and 77 K (b1, b2). The black areas were not resolved due to a large amount of deformation or stress concentration.

Fig. 6. EBSD IPF map (a) and phase map (b) of the Fe55 MEA after tensile fracture at 77 K. The black areas were not resolved due to a large amount of deformation or stress concentration.

Fig. 7. Engineering stress-strain curves of FexMn75-xNi10Cr15 (x = 40, 45, 50 and 55 at.%) MEAs at 293 K.

Fig. 8. (a) Fracture elongation versus ultimate tensile strength of Fe50 and Fe55 MEAs together with typical HEAs and other high-performing alloys at 77 K. (b) Lower raw material price of both studied MEAs together with other alloys.

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