논문 해외 국제전문학술지(SCI급) On the activation of alternated stacking fault pair twinning mechanism in a very large-grained Fe-29Mn-2.4Al steel
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2020-02
- 저자명 김정한,M. Ghiasabadi Farahani,A. Zarei-Hanzaki,H.R. Abedi,M. Jaskari,P. Sahu,L.P. Karjalainen
- 학술지명 SCRIPTA MATERIALIA
- 발행처명 PERGAMON-ELSEVIER SCIENCE LTD
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 7
홈페이지논문 초록 (Abstract)
An alternated stacking fault (SF) pair twinning mechanism involving local fcc -> hcp transformation in a very large-grained high-Mn austenitic steel is reported, which hitherto was valid for nano crystalline metals. It was identified using high-resolution transmission electron microscopy that a pre-twinned epsilon-martensite like phase, containing local hcp structure is converted to a stable three-layer twin lamella through nucleation of new SF in-between the pre-existing SFs. Activation of observed mechanism is deciphered in terms of the low intrinsic and unstable stacking fault energies ratio of the steel (similar to 0.13), predicted using a model based on density functional theory. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.