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

• Published in: Materials Research Letters Vol. 12; no. 1; pp. 26 - 33
• Main Authors: Feng, Shuai, Guan, Shuai, Liu, Xiangkui, Peng, Siyuan, Dong, Kewei, Yang, Yang, Chen, Xinsheng, Liang, Yuzheng, Wang, Qipeng, Liu, Yanfang, Peng, Yong, Wang, Kehong, Chen, Wen, Kong, Jian
• Format: Report
• Language: English
• Published: Taylor & Francis 02.01.2024
• Subjects: Eutectic high-entropy alloy; Lamellar structure; martensitic transformation; mechanical properties; strengthening mechanism
• ISSN: 2166-3831
• DOI: 10.1080/21663831.2023.2284328

We report a cast light-weight dual-phase eutectic high-entropy alloy (EHEA) of Ni 49 Fe 28 Al 17 V 6 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. A novel cast Ni 49 Fe 28 Al 17 V 6 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.