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

An，Zibing1; Mao，Shengcheng1; Jiang，Cheng1; Li，Ziyao1; Wu，Shichang1; Zhai，Yadi1; Wang，Li1; Liu，Yinong2; Zhang，Ze1,3; Han，Xiaodong1,4

2024-01-15

10.1016/j.scriptamat.2023.115809

Scripta Materialia   影响因子和分区

1359-6462

A CoCrFeMnNiSi 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.

Hetero-deformation induced hardening Heterogeneous structure High-entropy alloy Mechanical properties

SCI ; EI

英语

其他

MATERIALS SCIENCE

2-s2.0-85173130446

Scopus

1.Beijing Key Laboratory of Microstructure and Property of Advanced Materials,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing,100124,China
2.Department of Mechanical Engineering,The University of Western Australia,Perth,6009,Australia
3.Center of Electron Microscopy,State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou,310058,China
4.Department of Materials Science & Engineering,Southern University of Science and Technology,ShenZhen,China

An，Zibing,Mao，Shengcheng,Jiang，Cheng,et al. Achieving superior combined cryogenic strength and ductility in a high-entropy alloy via the synergy of low stacking fault energy and multiscale heterostructure[J]. Scripta Materialia,2024,239.

An，Zibing.,Mao，Shengcheng.,Jiang，Cheng.,Li，Ziyao.,Wu，Shichang.,...&Han，Xiaodong.(2024).Achieving superior combined cryogenic strength and ductility in a high-entropy alloy via the synergy of low stacking fault energy and multiscale heterostructure.Scripta Materialia,239.

An，Zibing,et al."Achieving superior combined cryogenic strength and ductility in a high-entropy alloy via the synergy of low stacking fault energy and multiscale heterostructure".Scripta Materialia 239(2024).