The effects of thermo-mechanical treatment on the mechanical properties and corrosion resistance behaviour of the (FeCoNiCr)92Ti3.5Al4.5 (at.-%) high-entropy alloy (HEA) were studied. Compared with the untreated specimen, the yield and ultimate tensile strength increased by 227.5% and 129.4% after thermo-mechanical treatment, with ductility remaining almost constant. The results indicated that the grain size refined from 233.44 to 2.31 μm, and the dislocation density considerably increased from 2.69 × 1012 to 1.23 × 1014. Notably, after thermo-mechanical treatment, the formation of precipitates can narrow the passivation zone, thus increasing the tendency of pitting corrosion. The corrosion current decreased and the radius of the impedance curve increased, indicating the corrosion resistance behaviour improved, which was attributed to the grain refinement.
YehJ-WChenS-KLinS-J, et al.Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. Adv Eng Mater2004; 6: 299–303.
2.
MacDonaldBEFuZZhengB, et al.Recent progress in high entropy alloy research. JOM2017; 69: 2024–2031.
3.
ShenHHZhangJWHuJT, et al.A novel TiZrHfMoNb high-entropy alloy for solar thermal energy storage. Nanomaterials (Basel)2019; 9: 48.
4.
LeeD-HParkJ-MYangGH, et al.Nano-graining a particle-strengthened high-entropy alloy. Scr Mater2019; 163: 24–28.
5.
HemphillMAYuanTWangGY, et al.Fatigue behavior of Al0.5CoCrCuFeNi high entropy alloys. Acta Mater2012; 60: 5723–5734.
6.
ChangHZhangTWMaSG, et al.Novel Si-added CrCoNi medium entropy alloys achieving the breakthrough of strength–ductility trade-off. Mater Des2021; 197: 109202.
7.
HeJYWangHHuangHL, et al.A precipitation-hardened high-entropy alloy with outstanding tensile properties. Acta Mater2016; 102: 187–196.
8.
PengHLHuLLiLJ, et al.Ripening of L12 nanoparticles and their effects on mechanical properties of Ni28Co28Fe21Cr15Al4Ti4 high-entropy alloys. Mater Sci Eng A2020; 772: 138803.
9.
YangHXLiJSGuoT, et al.Fully recrystallized Al0.5CoCrFeNi high-entropy alloy strengthened by nanoscale precipitates. Met Mater Int2019; 25: 1145–1150.
10.
ZouYLiSLLiuSH, et al.Improved mechanical and corrosion properties of CrMnFeCoNi high entropy alloy with cold rolling and post deformation annealing process. J Alloys Compd2021; 887: 161416.
11.
WangMZWenZQMaB, et al.Enhancing the strength of AlCrFeNi HEAs via tailoring aluminum content and optimal aging treatment. J Alloys Compd2022; 893: 162242.
12.
XingBWZuoXJLiQN, et al.Influence of microstructure evolution on the electrochemical corrosion behavior of (CoCrFeNi)94Ti1.5Al4.5 high entropy alloy coatings. J Therm Spray Techn2022; 31: 1375–1385.
13.
QiYLWuYKCaoTH, et al.L21-strengthened face-centered cubic high-entropy alloy with high strength and ductility. Mater Sci Eng A2020; 797: 140056.
14.
LiuGWangCHanZH, et al.Serrated flow stress and nano-precipitation in (CoCrFeNi)94Ti2Al4 high entropy alloy. Intermetallics2022; 141: 107429.
15.
WuYWZhaoXYChenQ, et al.Strengthening and fracture mechanisms of a precipitation hardening high-entropy alloy fabricated by selective laser melting. Virtual Phys Prototyp2022; 17: 451–467.
16.
LiuMWZhengRXLiJ, et al.Achieving ultrahigh tensile strength of 1 GPa in a hierarchical nanostructured 2024 Al alloy. Mater Sci Eng A2020; 788: 139576.
17.
LiSCGuoCYHaoLL, et al.In-situ EBSD study of deformation behaviour of 600 MPa grade dual phase steel during uniaxial tensile tests. Mater Sci Eng A2019; 759: 624–632.
18.
QiYLCaoTHZongHX, et al.Enhancement of strength–ductility balance of heavy Ti and Al alloyed FeCoNiCr high-entropy alloys via boron doping. J Mater Sci Technol2021; 75: 154–163.
19.
NiuSZKouHCGuoT, et al.Strengthening of nanoprecipitations in an annealed Al0.5CoCrFeNi high entropy alloy. Mater Sci Eng A2016; 671: 82–86.
20.
LiDYLiCXFengT, et al.High-entropy Al0.3CoCrFeNi alloy fibers with high tensile strength and ductility at ambient and cryogenic temperatures. Acta Mater2017; 123: 285–294.
21.
GaoXZLuYPZhangB, et al.Microstructural origins of high strength and high ductility in an AlCoCrFeNi2.1 eutectic high-entropy alloy. Acta Mater2017; 141: 59–66.
22.
WangZGZhouWFuLM, et al.Effect of coherent L12 nanoprecipitates on the tensile behavior of a fcc-based high-entropy alloy. Mater Sci Eng A2017; 696: 503–510.
23.
HeFChenDHanB, et al.Design of DO22 superlattice with superior strengthening effect in high entropy alloys. Acta Mater2019; 167: 275–286.
24.
HirschornBOrazemMETribolletB, et al.Determination of effective capacitance and film thickness from constant-phase-element parameters. Electrochim Acta2010; 55: 6218–6227.
25.
BommersbachPAlemany-DumontCMilletJP, et al.Formation and behaviour study of an environment-friendly corrosion inhibitor by electrochemical methods. Electrochim Acta2005; 51: 1076–1084.
26.
BrugGJVan den EndenALGSluyters-RehbacnM, et al.The analysis of electrode impedances complicated by the presence of a constant phase element. J Electroanal Chem Interf Electrochem1984; 176: 275–295.
27.
AmeerMAFekryAMHeakalFET. Electrochemical behaviour of passive films on molybdenum-containing austenitic stainless steels in aqueous solutions. Electrochim Acta2004; 50: 43–49.
28.
CuiZQinZDongP, et al.Microstructure and corrosion properties of FeCoNiCrMn high entropy alloy coatings prepared by high speed laser cladding and ultrasonic surface mechanical rolling treatment. Mater Lett2020; 259: 126769.
29.
LiXYLuLLiJG, et al.Mechanical properties and deformation mechanisms of gradient nanostructured metals and alloys. Nat Rev Mater2020; 5: 706–723.
30.
ListyawanTALeeHParkN, et al.Microstructure and mechanical properties of CoCrFeMnNi high entropy alloy with ultrasonic nanocrystal surface modification process. J Mater Sci Technol2020; 57: 123–130.
31.
CorderoZCKnightBESchuhCA. Six decades of the Hall–Petch effect – a survey of grain-size strengthening studies on pure metals. Int Mater Rev2016; 61: 495–512.
32.
LiuWHWuYHeJY, et al.Grain growth and the Hall–Petch relationship in a high-entropy FeCrNiCoMn alloy. Scr Mater2013; 68: 526–529.
33.
QinXMShekCH. Heterogeneous structure design to strengthen carbon-containing CoCrFeNi high entropy alloy. Acta Metall Sin-Engl2021; 34: 1503–1510.
34.
CaoBXYangTLiuW-H, et al.Precipitation-hardened high-entropy alloys for high-temperature applications: a critical review. MRS Bull2019; 44: 854–859.
35.
YangTZhaoYLTongY, et al.Multicomponent intermetallic nanoparticles and superb mechanical behavior
36.
s of complex alloys. Science2018; 362: 933–937.
37.
CuiPCLiuYZhouF, et al.Enhancing high temperature mechanical properties via modulating B2 phase with Al contents in FeCrNiAlx(x = 0.63, 0.71, 0.77) high entropy alloys. J Alloys Compd2022; 903: 163883.
