Lightweight Co-free eutectic high-entropy alloy with high strength and ductility by casting

Abstract

We report a cast light-weight dual-phase eutectic high-entropy alloy (EHEA) of Ni₄₉Fe₂₈Al₁₇V₆ that comprises of alternating FCC and ordered B2 lamellae. Such lamellar EHEA exhibits a superior tensile strength of ∼ 1.3 GPa in combination with a large uniform elongation of ∼ 26%, well surpassing those of other state-of-the-art cast EHEAs. The high strength-ductility synergy originates largely from the extensive dislocation activities in both FCC and B2 lamellae. In addition, the martensitic transformation of the B2 lamellae during deformation further promotes the work hardening capability to enhance the tensile strength and ductility.

GRAPHICAL ABSTRACT

IMPACT STATEMENT

A novel cast Ni₄₉Fe₂₈Al₁₇V₆ eutectic high-entropy alloy comprised of FCC and B2 nanolamellae exhibits a remarkable combination of tensile strength and uniform elongation, well surpassing those of other state-of-the-art cast eutectic high-entropy alloys.

KEYWORDS:

• Eutectic high-entropy alloy
• Lamellar structure
• mechanical properties
• strengthening mechanism
• martensitic transformation

Acknowledgements

Siyuan Peng acknowledges the finanical support from the Natural Science Foundation of Xiamen, China, (No. 3502Z202371022). Shuai Feng acknowledges the financial support from the China Scholarship Council (CSC NO. 201906840076).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability

Data will be made available on request.