J Mater Sci Technol ›› 2007, Vol. 23 ›› Issue (01): 102-106.

• Research Articles • Previous Articles     Next Articles

Effects of Alloying Elements on the Volume Fraction of Ordered α2 Phase Precipitated in Ti-Al-Sn-Zr Alloys

Jun ZHANG, Na PENG, Xinan WANG, Li LI, Qingjiang WANG   

  1. Department of Materials Science and Engineering, Shenyang University, Shenyang 110044, China...
  • Received:2006-06-30 Revised:2006-07-13 Online:2007-01-28 Published:2009-10-10
  • Contact: Jun ZHANG

Abstract: An ideal method has been established for calculating the precipitation ofα2 ordered phase in near-α titanium alloys based on the theory on the critical electron concentration for the precipitation of α2 ordered phase in near-α titanium alloys. With complete precipitation of α2 phase in near-α titanium alloys, the alloys can be considered to be composed of two parts: (1) the ®2 ordered phase with the stoichiometric atomic ratio of Ti3X; (2) the disorder solid solution with the critical composition in which the α2 ordered phase is just unable to precipitate. By using this method, the volume fractions of α2 ordered phase precipitated in Ti-Al, Ti-Sn, Ti-Al-Sn-Zr alloys with various Al, Sn and/or Zr contents have been calculated. The influences of Al and Sn on the precipitation of α2 ordered phase are discussed. The calculating results show substantial agreement with the experimental ones.

Key words: Ordered α2 phase, Precipitation, Electron concentration, Titanium alloys