Effects of hot pressing temperature on microstructure, hardness and corrosion resistance of Al2NbTi3V2Zr high-entropy alloy

A novel lightweight high-entropy alloy Al2NbTi3V2Zr was fabricated by vacuum hot pressing. The effects of sintering temperature (1200-1550 degrees C) on the microstructure, hardness and corrosion resistance of the alloy were investigated. Results showed that Al2NbTi3V2Zr mainly consisted of simple cubic matrix and (Zr, Al)-based intermetallic phase (a-phase) at sintering temperatures of 1200-1350 degrees C. Moreover, the matrix phase transformed from simple cubic to body-centred cubic phase, and (Ti, Zr, Al)-based intermetallic precipitated from the matrix at temperature of 1450 degrees C. The fabricated Al2NbTi3V2Zr alloy had low density of 5.05-5.23 g cm(-3), high hardness of 510-728 HV and excellent corrosion resistance in 10 wt-% HNO3 solution.