Exceptional combinations of tensile properties and corrosion resistance in a single-phase Ti1.6ZrNbMo0.35 refractory high-entropy alloy

• Published in: Intermetallics Vol. 171; p. 108349
• Main Authors: Wang, Hao, Chen, Weiping, Liu, Shiyu, Chu, Chenliang, Huang, Liran, Duan, Jiaqi, Tian, Zhao, Fu, Zhiqiang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2024
• Subjects: Corrosion resistance; Mechanical properties; Refractory high-entropy alloy; Solid solution strengthening; Corrosion resistance; Mechanical properties; Solid solution strengthening; Refractory high-entropy alloy
• ISSN: 0966-9795; 1879-0216
• DOI: 10.1016/j.intermet.2024.108349

In this study, we introduce a novel single-phase Ti1·6ZrNbMo0.35 refractory high-entropy alloy (RHEA), synthesized through vacuum arc-melting. The as-cast RHEA demonstrates excellent mechanical properties with a high yield strength of ∼930 MPa and a large tensile strain of ∼15.4 %, achieved through severe lattice distortion. Moreover, our investigation reveals the superior corrosion resistance of the RHEA in 3.5 wt% NaCl solution. The remarkable anti-corrosion properties are attributed to the single-phase structure, the increase of Mo6+ oxides in the passive film and continuous passive oxidation of the elements. This work provides a new and significant approach to designing novel RHEAs with excellent combinations of strength-ductility synergy and superior corrosion resistance. [Display omitted] •Ti1·6ZrNbMo0.35 RHEA with a single-phase BCC structure was successfully developed and fabricated.•The as-cast RHEA shows a high tensile yield strength of ∼930 MPa and a large fracture strain of ∼15.4 %.•The as-cast RHEA shows excellent corrosion resistance in 3.5 wt% NaCl solution.•Excellent combinations of mechanical properties and corrosion resistance in RHEA was achieved.