Microstructure refinement assisted by α-recrystallization in a peritectic TiAl alloy

Journal of Materials Research and Technology

Yongfeng Liang¹  Zitong Gao²  Jieren Yang³  Jinguang Li⁴  Yulun Wu⁵  Rui Hu⁵ 

[1] Corresponding author.;State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China;School of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China;State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China;State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China;

关键词: Titanium aluminides;    α-Processing;    Microstructure refinement;    Continuous dynamic recrystallization;    Phase transformation;   

DOI  :  

来源: DOAJ

【 摘 要 】

Fine-grained nearly-lamellar (FGNL) microstructures and ultrafine α2/γ lamellar microstructure were successfully obtained by means of α-recrystallization in a Ti–48Al–2Nb–2Cr alloy. The dynamic recrystallization of α phases and subsequent cooling control contributed to microstructure refinements, which were governed by small-strain α-deformation. Lamellar grain refinement is due to dominating continuous dynamic recrystallization (CDRX). Lamellar structure refinement is mainly achieved by the increase in γ lamellae precipitation sites by α-deformation and fast cooling. Finally, the microstructure evolution and control mechanisms were illustrated, suggesting a promising method for improving the mechanical properties of TiAl alloy.

【 授权许可】

Unknown