A lightweight Al0.8Nb0.5Ti2V2Zr0.5 refractory high entropy alloy with high specific yield strength

Abstract

• The Al 0.8 Nb 0.5 Ti 2 V 2 Zr 0.5 alloy has a low density of 5.35 g/cm 3 and a high hardness of 5.86 GPa. • The alloy shows high yield strength at 298, 873, and 1073 K of 1418, 931, and 760 MPa, respectively. • The alloy shows high SYS at 298, 873, and 1073 K of 302, 245, and 154 kPa•m 3 kg -1 , respectively. A novel low density Al 0.8 Nb 0.5 Ti 2 V 2 Zr 0.5 refractory high-entropy alloy with dual-phase structure was prepared by vacuum arc melting. The microstructure is composed of BCC solid solution matrix phase and a few C14-Laves phase. The alloy has a low density of 5.35 g/cm 3 and a high hardness of 5.86 GPa. The compressive yield strength achieved 1418 MPa at room temperature and reached 931 MPa at 873 K and then dropped to 760 MPa at 1073 K. Compared with Inconel 718 superalloy and other refractory alloys, the specific yield strength at different temperatures and the density of the Al 0.8 Nb 0.5 Ti 2 V 2 Zr 0.5 alloy are more excellent.