HfZrTiNbx (x = 0.25, 0.50, 0.75, 1.00, and 1.25 at. %) high-entropy alloys were prepared using a vacuum arc furnace, and their phase composition and tensile properties were investigated. The results showed that the HfZrTiNb0.25 and HfZrTiNb0.50 alloys consisted of β phase, α phase, and ω phase, while the other alloys were composed of β phase. The yield strength of the HfZrTiNb0.25 alloy was 817 MPa, but its elongation at break was 1.4%, which was attributed to the presence of the α phase. As the Nb content increased, the alloy's ductility also improved, with the HfZrTiNb1.25 alloy exhibiting an elongation at break of 20.5%. The primary reason for the excellent ductility of this alloy was the increased dislocation density and entangled dislocations.
YehJWChenSKLinSJ, et al.Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. Adv Eng Mater2004; 6: 299–303.
2.
TuCHWuSKLinC. A study on severely cold-rolled and intermediate temperature aged HfNbTiZr refractory high-entropy alloy. Intermetallics2020; 126: 106935.
LiYLuoHLiW, et al.Hierarchical FeCoNiCr high entropy alloy thin films with combined high strength and excellent corrosion resistance. Mater Design2023; 231: 112049.
5.
YanXHLiawPKZhangY. Ultrastrong and ductile BCC high-entropy alloys with low-density via dislocation regulation and nanoprecipitates. J Mater Sci Technol2022; 110: 109–116.
6.
OzerovMYurchenkoNSokolovskyV, et al.Microstructure and mechanical properties of biomedical Ti-Zr-Nb-Ta-Sn high-entropy alloys. Metals2023; 13: 353.
7.
HaftlangFZargaranASonS, et al.The subsurface deformed region and superficial protective tribo-oxide layer during wear in a non-equiatomic CoCrFeNiV high entropy alloy. Mater Design2022; 218: 110685.
8.
NagarjunaCJeongKYLeeY, et al.Strengthening the mechanical properties and wear resistance of CoCrFeMnNi high entropy alloy fabricated by powder metallurgy. Adv Powder Technol2022; 33: 103519.
9.
TanjiAFanXSSakidjaR, et al.Niobium addition improves the corrosion resistance of TiHfZrNbx high-entropy alloys in Hanks’ solution. Electrochim Acta2022; 424: 140651.
10.
KadyrzhanovKKKozlovskiyALShlimasDI, et al.Study of the radiation damage kinetics in NbTiVZr high-entropy alloys irradiated by heavy ions. Metals2023; 13: 727.
11.
WuYLiawPKLiRX, et al.Relationship between the unique microstructures and behaviors of high-entropy alloys. Int J Miner Metall Mater2024; 31: 1350–1363.
12.
PayalHSharma MudaharI. Understanding stability of FeTiVNi and CoFeVNi high entropy alloys using density functional theory. ECS Trans2022; 107: 20005–20012.
13.
ZengXKLiYTZhangXD, et al.Effect of bias voltage on the structure and properties of CuNiTiNbCr dual-phase high entropy alloy films. J Alloys Compd2023; 931: 167371.
14.
HaoWJunXYangHY, et al.A cost-effective eutectic high entropy alloy with an excellent strength-ductility combination designed by VEC criterion. J Mater Res Technol2022; 19: 1759–1765.
15.
ZhouCZhouLLLiM, et al.Microstructure and mechanical properties of multi-principal component CoCrNiMo medium entropy alloys. Mater Today Commun2024; 38: 108180.
16.
WangQZengLCGaoTF, et al.On the room-temperature tensile deformation behavior of a cast dual-phase high-entropy alloy CrFeCoNiAl0.7. J Mater Sci Technol2021; 87: 29–38.
17.
LiZMRaabeD. Influence of compositional inhomogeneity on mechanical behavior of an interstitial dual-phase high-entropy alloy. Mater Chem Phys2018; 210: 29–36.
18.
CoomanBCD. Structure-properties relationship in TRIP steels containing carbide-free bainite. Curr Opin Solid St M2004; 8: 285–303.
19.
LiZMPradeepKGDengY, et al.Metastable high-entropy dual-phase alloys overcome the strength–ductility trade-off. Nature2016; 534: 227–230.
20.
MaELiuC. Chemical inhomogeneities in high-entropy alloys help mitigate the strength-ductility trade-off. Prog Mater Sci2024; 143: 101252.
21.
CaiPCLiuJHLuanJ, et al.Local chemical fluctuation-tailored hierarchical heterostructure overcomes strength-ductility trade-off in high entropy alloys. J Mater Sci Technol2025; 214: 74–86.
22.
LiHZongHXLiSZ, et al.Uniting tensile ductility with ultrahigh strength via composition undulation. Nature2022; 604: 273–279.
23.
BraicMBraicVVladescuA, et al.Solid solution or amorphous phase formation in TiZr-based ternary to quinternary multi-principal-element films. Prog Nat Sci-Mater2014; 24: 305–312.
24.
WuYDCaiYHWangT, et al.A refractory Hf25Nb25Ti25Zr25 high-entropy alloy with excellent structural stability and tensile properties. Mater Lett2014; 130: 277–280.
25.
ChenJMaFCLiuP, et al.Effects of Nb on superelasticity and low modulus properties of metastable β-Type Ti-Nb-Ta-Zr biomedical alloys. J Mater Eng Perform2019; 28: 1410–1418.
26.
GuoSHuQNgC, et al.More than entropy in high-entropy alloys: forming solid solutions or amorphous phase. Intermetallics2013; 41: 96–103.
27.
YangXZhangY. Prediction of high-entropy stabilized solid-solution in multi-component alloys-ScienceDirect. Mater Chem Phys2012; 132: 233–238.
28.
GuoSNgCLuJ, et al.Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys. J Appl Phys2011; 109: 103505.
29.
TakeuchiAInoueA. Classification of bulk metallic glasses by atomic size difference, heat of mixing and period of constituent elements and its application to characterization of the main alloying element. Mater Trans2005; 46: 1347–5320.
30.
HuYMLiuXDGuoNN, et al.Microstructure and mechanical properties of NbZrTi and NbHfZrTi alloys. Rare Met2019; 38: 840–847.
31.
SikkaSKVohraYKChidambaramR. Omega phase in materials. Prog Mater Sci1982; 27: 245–310.
32.
XunKHZhangBZWangQ, et al.Local chemical inhomogeneities in TiZrNb-based refractory high-entropy alloys. J Mater Sci Technol2023; 135: 221–230.
33.
BuYQWuYLeiZF, et al.Local chemical fluctuation mediated ductility in body-centered-cubic high-entropy alloys. Mater Today2021; 46: 28–34.
