J Mater Sci Technol ›› 2006, Vol. 22 ›› Issue (05): 616-620.

• Research Articles • Previous Articles     Next Articles

Microstructural Evolution of Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd Titanium Alloy with Carbon Additions

Shangzhou ZHANG, Yuan GAO, Ziquan LIU, Yuyin LIU, Rui YANG   

  1. School of Environment and Materials Engineering, Yantai University, Yantai 264005, China; Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2005-02-25 Revised:2005-06-20 Online:2006-09-28 Published:2009-10-10
  • Contact: Shangzhou ZHANG

Abstract: The effect of carbon addition on microstructural evolution was studied in a near-α titanium alloy (Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd). It was found that flake and ribbon titanium carbides with a NaCl crystal structure formed in the as-cast alloys with carbon additions of over 0.17 wt pct. Flake carbide particles are the product of eutectic transformation and precipitate from the high-temperature β phase. The ribbon carbide particles are primary phases formed prior to the nucleation of any metallic phases. The as-cast alloys with carbide precipitation after heat-treatment at βt-30℃ followed by water quenching showed the spheroidization of α lamellae and partial dissolution of carbide particles. After annealing at βt+15℃, carbide particles are mostly distributed at the grain boundary and spheroidized through mixed grain boundary plus bulk diffusions.

Key words: Titanium alloy, Carbon, Microstructure, Heat treatment, Carbide