Mechanical stability of lamellar microstructure in TiAl:an atomic-scale study

Journal of Materials Research and Technology

Jianxin Zhou¹  Xu Shen²  Yajun Yin³  Hai Nan⁴  Qian Xu⁴  Xiaoyuan Ji⁴  Wen Li⁴  Wen Yu⁴ 

[1]AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, China

[2]Corresponding author.

[3]AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, China

[4]State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China

关键词: TiAl alloy;    Mechanical stability;    Lamellar interface;    Molecular dynamics simulation;   

DOI  :  

来源: DOAJ

【 摘 要 】

Mechanical stability of lamellar microstructure in γ-TiAl has been studied, for the first time, from the perspective of three different γ/γ lamellar interfaces evolution at atomic scale via molecular dynamics simulations. Results indicate that small lamellar spacing promotes the formation of longitudinal twinning, thus influences the mechanical stability of TiAl lamellar structure. Pseudo-twin (PT) and rotational boundary (RB) lamellar interfaces transfer to each other while the true-twin (TT) lamellar interface migrates directly and annihilates resulting from interaction with longitudinal twinning during deformation. Therefore, compared with the TiAl lamellar structure with TT interface, structure with PT and RB interfaces exhibit higher mechanical stability.

【 授权许可】

Unknown