Achieving superior combined cryogenic strength and ductility in a high-entropy alloy via the synergy of low stacking fault energy and multiscale heterostructure

Zibing An, Shengcheng Mao, Cheng Jiang, Ziyao Li, Shichang Wu, Yadi Zhai, Li Wang, Yinong Liu, Ze Zhang, Xiaodong Han

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

A Co30Cr20Fe18Mn18Ni11Si3 high-entropy alloy (HEA) with low stacking fault energy and high strengthen was designed based on the principle of heterostructure strengthening. The alloy was processed into a multiscale heterogeneous microstructure containing hierarchical twins. The alloy achieved an ultrahigh yield strength of 1500 MPa, ultimate tensile strength of 1750 MPa and a large ductility of 20 % at 77 K. These mechanical properties were superior to those of most FCC HEAs reported in the literature, breaking the strength-ductility trade-off of conventional metal alloys. Such extraordinary mechanical properties were attributed to a suitable strain hardening capability, stemming from the synergistic effect of hetero-deformation-induced hardening, twinning-induced plasticity, and deformation-induced phase transformation during tensile deformation.
Original languageEnglish
Article number115809
Number of pages7
JournalScripta Materialia
Volume239
Early online date8 Oct 2023
DOIs
Publication statusPublished - 15 Jan 2024

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