J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (4): 666-669.DOI: 10.1016/j.jmst.2017.10.011

Special Issue: Titanium Alloys 2018

• Orginal Article • Previous Articles     Next Articles

Distinct dendritic α phase emerging on the surface of primary α phase in a compressed near-α titanium alloy

Z. Liuab, Z.B. Zhaoa*(), J.R. Liua*(), Q.J. Wanga, R. Yangaa   

  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, Hefei 230000, China
  • Received:2017-07-03 Revised:2017-08-29 Accepted:2017-09-19 Online:2018-04-20 Published:2018-05-04
  • Contact: Zhao Z.B.,Liu J.R.

Abstract:

The characteristic of the surface morphology of primary α phase was studied in a deformed near-α titanium alloy. Dendritic α phase emerged on the surfaces of primary α phase when the alloy was air-cooled in α + β phase field after deformation. The dendritic α grain has the same orientation with its original primary α grain. The formation of the dendritic α phase could be explained by interface instability in epitaxial growth process of the primary α phase. The dislocations induced by deformation could facilitate the formation of dendritic α phase leading to the dendritic α phase and more obvious with the increase of strain. The growth of dendritic α phase was finally limited by the nucleation of second α phase with cooling.

Key words: Epitaxial growth, Dendritic α phase;, Microstructure, Interface instability, Hot deformation