J. Mater. Sci. Technol. ›› 2024, Vol. 194: 138-141.DOI: 10.1016/j.jmst.2024.01.027

• Letter • Previous Articles     Next Articles

Formation mechanism of three-fold ${10\bar{1}1}$α twins during β to α phase transformation in titanium

Z.C. Menga,b, J.H. Zhanga,b,*, D. Lia,b, H. Guoa,b, H. Wangc, D.S. Xua,b, Z.B. Zhaoa,b, Q.J. Wanga,b, R. Yanga,b   

  1. aInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    bSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
    cInterdisciplinary Centre for Additive Manufacturing (ICAM), School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Revised:2023-12-19 Published:2024-09-20 Online:2024-09-14
  • Contact: *E-mail addresses: jinhuzhang@imr.ac.cn (J.H. Zhang), hao.wang.7@icloud.com (H. Wang), dsxu@imr.ac.cn (D.S. Xu)

Abstract: The formation mechanism of three-fold twins during β to α phase transformation in titanium was investigated. Such twins were found to form by three α variants with the ${10\bar{1}1}$α twin relationship. Three-fold twins have the lowest elastic interaction energy and are favored by the existence of screw dislocations. The present result reveals the stress and defect origins of three-fold twins and provides theoretical support for obtaining the microstructure containing intensive three-fold twins with high symmetry through stress-induced and dislocation-mediated α phase nucleation in titanium alloys.

Key words: Phase transformation, Twin, Dislocation, Titanium, Variant selection