Deformation-induced interfacial-twin-boundary ω-phase in an Fe48Mn37Al15 body-centered cubic metastable alloy

Peng，Huabei1; Yang，Xiao2,3; Sun，Lixin1; Yong，Liqiu1; Yan，Jiazhen1; Zhang，Jinyong4,6; Qian，Bingnan1,5; Wen，Yuhua1

2023-05-20

Interfacial-twin-boundary ω-phase Iron alloys Martensitic transformation Plastic deformation Twinning

English

ω-phase transformation, which plays a key role in modifying mechanical properties, is widely observed in group IV transition alloys. However, the widely accepted ω-phase has not been found in body-centered cubic (BCC) Fe-based alloys yet. In this study, an FeMnAl alloy displayed α → γ' martensitic transformation during a 6%–21% compressive process, and {112}<111> mechanical twinning occurred at 21% compressive strain. Furthermore, a thin layer of interfacial-twin-boundary ω-phase was confirmed located at the boundaries of twinning in this alloy. The possibility of artifacts ω-phase in FeMnAl alloy was carefully ruled out via transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) observation. Therefore, a deformation-induced interfacial-twin-boundary ω-phase has been proven to be formed in an FeMnAl alloy during the compression process. In addition, this ω-phase was analyzed and found to agree with the classic crystallographic orientation relationship with both α matrix and {112} twin. Hence, a geometrical model was schematically used to analyze the formation process of the interfacial-twin-boundary ω-phase.

10.1016/j.jmst.2022.09.056

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

146

252-258

1005-0302

SCI

Others

2-s2.0-85145659032

Scopus

WOS:000920493200001

MATERIALS SCIENCE

1.School of Mechanical Engineering,Sichuan University,Chengdu,610065,China
2.School of Mechanical Engineering,Hebei University of Technology,Tianjin,300401,China
3.State Key Laboratory of Materials Processing and Die and Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan,430074,China
4.School of Materials and Physics,China University of Mining and Technology,Xuzhou,221116,China
5.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
6.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an,710072,China

Peng，Huabei,Yang，Xiao,Sun，Lixin,et al. Deformation-induced interfacial-twin-boundary ω-phase in an Fe48Mn37Al15 body-centered cubic metastable alloy. 2023-05-20.