Effects of hot pressing temperature on microstructure,hardness and corrosion resistance of Al 2 NbTi 3 V 2 Zr high-entropy alloy

Abstract

A novel lightweight high-entropy alloy Al₂NbTi₃V₂Zr was fabricated by vacuum hot pressing. The effects of sintering temperature (1200–1550°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 (α-phase) at sintering temperatures of 1200–1350°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°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.

Keywords

Sintering temperature Microstructure Hardness Corrosion resistance

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