Realizing superior strength-ductility combination in dual-phase AlFeCoNiV high-entropy alloy through composition and microstructure design

Abstract

Achieving high strength and ductility simultaneously in high-entropy alloys (HEAs) has always been a challenge, and recent studies indicate that duplex microstructure provides a strategy to solve this contradiction. We prepared Al0.25FeCoNiV HEA with L12/B2 fine-grain duplex microstructure and achieved a remarkable combination of the ultimate tensile strength (1530 MPa) and ductility (20%), which clearly outperforms other duplex HEAs. Owing to the formation of fine-grain microstructure and the hindrance of the B2 phase, high yield strength has been achieved. Furthermore, the excellent work-hardening ability of the L12 phase and the dispersion of the B2 phase ensured uniform deformation and high strength.

Keywords

• High-entropy alloys
• dual-phase microstructure
• strength–ductility trade-off