A cold-rolled B1.5(CrFeNi)98.5 medium-entropy alloy was annealed at 600–1000 °C for 1 h to investigate the microstructure and mechanical properties evolution duding recrystallization annealing process. The as-cast alloy exhibited an FCC + Cr2B dual-phase structure and dendritic microstructure. The annealed alloy exhibited a typical bimodal grain structure. Massive BCC-structured precipitate with a nano-scale formed in FCC pahse, whose content reached the peak around 800 °C, and then almost disappeared at 1000 °C. The yield strength of the alloy reduced from 1225 MPa in cold-rolling state to 330 MPa when annealed at 1000 °C, and the elongation raised from 2.4% to 33.8%. The alloy annealed at 800°C displayed a good strength-plasticity balance with a yield strength of 601 MPa and an elongation of 20%.
CantorBChangITHKnightP, et al.Microstructural development in equiatomic multicomponent alloys [J]. Mater Sci Eng2004; 375–377: 213–218.
2.
GludovatzBHohenwarterACatoorD, et al.A fracture-resistant high-entropy alloy for cryogenic applications [J]. Science2014; 345: 1153–1158.
3.
KumarNAPKLiCLeonardKJ, et al.Microstructural stability and mechanical behavior of FeNiMnCr high entropy alloy under ion irradiation [J]. Acta Mater2016; 113: 230–244.
4.
LeeGTWonJWLimKR, et al.Effect of microstructural features on the high-cycle fatigue behavior of CoCrFeMnNi high entropy alloys deformed at room and cryogenic temperatures [J]. Met Mater Int2021; 27: 593–602.
5.
LuoHLiZMingersAM, et al.Corrosion behavior of an equiatomic CoCrFeMnNi high-entropy alloy compared with 304 stainless steel in sulfuric acid solution [J]. Corrosion Sci2018; 134: 131–139.
6.
SonSKimSKwakJ, et al.Superior antifouling properties of a CoCrFeMnNi high-entropy alloy [J]. Mater Lett2021; 300: 130130.
7.
SathiyamoorthiPAsghari-RadPParkJM, et al.Exceptional cryogenic strength-ductility synergy in Al0.3CoCrNi medium entropy alloy through heterogeneous grain structure and nano-scale precipitates [J]. Mater Sci Eng2019; 766: 138372.
8.
BaeJWKimHS. Towards ferrous medium-entropy alloys with low-cost and high-performance [J]. Scripta Mater2020; 186: 169–173.
9.
JoYHChoiWMKimDG, et al.FCC To BCC transformation-induced plasticity based on thermodynamic phase stability in novel V10Cr10Fe45CoxNi35−x medium-entropy alloys [J]. Sci Rep2019; 9: 2948.
10.
YiJYangLWangL, et al.Lightweight, refractory high-entropy alloy CrNbTa0.25TiZr with high yield strength [J]. Met Mater Int2022; 28: 448–455.
11.
HuCZhangJZhangY, et al.Improvement on mechanical properties of a bcc matrix Al8(FeCuCrMn)92 high-entropy alloy by phase modulation of interstitial carbon element [J]. Met Mater Int2022; 28: 523–533.
12.
WangZBakerIGuoW, et al.The effect of carbon on the microstructures, mechanical properties, and deformation mechanisms of thermos-mechanically treated Fe40.4Ni11.3Mn34.8Al7.5Cr6 high entropy alloys [J]. Acta Mater2017; 126: 346–360.
13.
WangZLuWRaabeD, et al.On the mechanism of extraordinary strain hardening in an interstitial high-entropy alloy under cryogenic conditions [J]. J Alloys Compd2018; 781: 734–743.
14.
SeolJBBaeJWLiZ, et al.Boron doped ultrastrong and ductile high-entropy alloys [J]. Acta Mater2018; 151: 366–376.
15.
JeongEHKimJHKimSH, et al.Efect of boron on the thermal stability of the precipitate phase of FC92B and FC92N steels during aging and creep [J]. Met Mater Int2021; 27: 985–994.
16.
SakthivelTDasCRLahaK, et al.Creep properties of intercritical heat treated boron added modified 9Cr–1Mo steel [J]. Met Mater Int2021; 27: 328–336.
17.
QiYLWuYKCaoTH, et al.L21-strengthened face-centered cubic high-entropy alloy with high strength and ductility [J]. Mater Sci Eng A2020; 797: 140056.
18.
YangBTMaLLZhaoPP. Effect of boron on the microstructure and mechanical properties of as-cast and annealed CrFeNi medium-entropy alloys [J]. Mater Sci Eng A2023; 863: 144524.
19.
GaoZLeeDHZhaoYK. Hydrogen trapping and micromechanical behavior in additively manufactured CoCrFeNi high-entropy alloy in as-built and pre-strained conditions [J]. Acta Mater2024; 271: 119886.
20.
LeeCPChenYYHsuCY, et al.The effect of boron on the corrosion resistance of the high entropy alloys Al0.5CoCrCuFeNiBx [J]. J Electrochem Soc2007; 154: C424–C430.
21.
SimmonsJW. Overview: high-nitrogen alloying of stainless steels [J]. Mater Sci Eng A1996; 207: 159–169.
22.
JungYSKangSJeongK, et al.The effects of N on the microstructures and tensile properties of Fe–15Mn–0.6C–2Cr–xN twinning-induced plasticity steels [J]. Acta Mater2013; 61: 6541–6548.
23.
TanHJiangYDengB, et al.Effect of annealing temperature on the pitting corrosion resistance of super duplex stainless steel UNS S32750 [J]. Mater Char2009; 60: 1049–1054.
24.
GuJSongM. Annealing-induced abnormal hardening in a cold rolled CrMnFeCoNi high entropy alloy [J]. Scripta Mater2019; 162: 345–349.
