On the activation of alternated stacking fault pair twinning mechanism in a very large-grained Fe-29Mn-2.4Al steel

被引：16

作者：

Farahani, M. Ghiasabadi ^{[1
]}

Zarei-Hanzaki, A. ^{[1
]}

Abedi, H. R. ^{[1
]}

Kim, Jeoung Han ^{[2
]}

Jaskari, M. ^{[3
]}

Sahu, P. ^{[4
]}

Karjalainen, L. P. ^{[5
]}

机构：

[1] Univ Tehran, Coll Engn, Sch Met & Mat Engn, Hot Deformat & Thermomech Proc Lab High Performan, Tehran, Iran

[2] Hanbat Natl Univ, Dept Mat Sci & Engn, Daejeon 34158, South Korea

[3] Univ Oulu, Future Mfg Technol Grp, Kerttu Saalasti Inst, Pajatie 5, FIN-85500 Nivala, Finland

[4] Jadavpur Univ, Dept Phys, Kolkata 700032, India

[5] Univ Oulu, Ctr Adv Steels Res, Box 4200, FIN-90014 Oulu, Finland

来源：

SCRIPTA MATERIALIA | 2020年 / 178卷 / 178期

基金：

芬兰科学院; 新加坡国家研究基金会;

关键词：

Twinning; Austenitic steel; High-resolution transmission electron microscopy; Stacking fault energy; Density function theory (DFT); CRACK-TIP; DEFORMATION; TRANSFORMATION; NUCLEATION; PLASTICITY; ENERGY; STRAIN; AL;

D O I：

10.1016/j.scriptamat.2019.11.035

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：301 / 306

页数：6

共 39 条

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