Activation of deformation twinning in ultrafine-grained high-entropy alloys via tailoring stacking fault energy and critical twinning stress

Nam, Seungjin; Son, Hansol; Song, Yongwook; Han, Juyeon; Ko, Won-Seok; Sohn, Seok Su; Kim, Hyoung Seop; Choi, Hyunjoo

doi:10.1016/j.msea.2023.146055

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Activation of deformation twinning in ultrafine-grained high-entropy alloys via tailoring stacking fault energy and critical twinning stress

Nam, Seungjin;
Son, Hansol;
Song, Yongwook;
Han, Juyeon;
Ko, Won-Seok;
... Sohn, Seok Su;
외 2명

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초록

"In this study, we propose a new material design approach to activate deformation twinning in ultrafine-grained (UFG) AlCoCrCuFeNiTi-based high-entropy alloys (HEAs) by considering both thermodynamic and microstructural aspects. Stacking fault energy of the solid-solution phase is reduced by tailoring composition with increasing Co/Ni ratio and diminishing the concentration of Al and Ti through precipitation. Furthermore, grain size is adjusted to enable the flow stress to surpass the critical twinning stress. It results in the activation of nano-twinning in the UFG HEAs, making the alloys exhibit high strain-hardening after yielding from 1.6 to 2.3 GPa. © 2024 Elsevier B.V.

키워드

Compositional tailoring; High-entropy alloys; Nano-twinning; Staking fault energy; Work-hardening; MECHANICAL-PROPERTIES; BEHAVIOR; NANOCRYSTALLINE; MICROSTRUCTURE; SIZE; CO; SEMICONDUCTORS; TRANSITION; METALS; TWIP

제목: Activation of deformation twinning in ultrafine-grained high-entropy alloys via tailoring stacking fault energy and critical twinning stress

저자: Nam, Seungjin; Son, Hansol; Song, Yongwook; Han, Juyeon; Ko, Won-Seok; Sohn, Seok Su; Kim, Hyoung Seop; Choi, Hyunjoo

DOI: 10.1016/j.msea.2023.146055

발행일: 2024-04

유형: Article

저널명: Materials Science and Engineering: A

권: 897

언어: ENG

출판사: Elsevier Ltd

발행국가: 스위스

ISSN: E 1873-4936
P 0921-5093