J. Mater. Sci. Technol. ›› 2023, Vol. 146: 252-258.DOI: 10.1016/j.jmst.2022.09.056

• Letter • Previous Articles    

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

Huabei Penga, Xiao Yangb,c, Lixin Suna, Liqiu Yonga, Jiazhen Yana, Jinyong Zhangd,f, Bingnan Qiana,e, Yuhua Wena   

  1. aSchool of Mechanical Engineering, Sichuan University, Chengdu 610065, China;
    bSchool of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China;
    cState 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;
    dSchool of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, China;
    eDepartment of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
    fState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China Innovation Center, NPU Chongqing, Chongqing 401135, China
  • Received:2022-07-09 Accepted:2022-09-29 Published:2023-05-20 Online:2023-05-15
  • Contact: * School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China. ** School of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, China. *** School of Mechanical Engineering, Sichuan University, Chengdu 610065, China. E-mail addresses: yangxiao520@hust.edu.cn (X. Yang), jyzhang@cumt.edu.cn (J. Zhang), qianbn@sustech.edu.cn (B. Qian)

Abstract: 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 Fe48Mn37Al15 alloy displayed α → γ' martensitic transformation during a 6%-21% compressive process, and {112}bcc<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 Fe48Mn37Al15 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 Fe48Mn37Al15 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}bcc twin. Hence, a geometrical model was schematically used to analyze the formation process of the interfacial-twin-boundary ω-phase.

Key words: Iron alloys, Twinning, Martensitic transformation, Plastic deformation, Interfacial-twin-boundary ω-phase