J Mater Sci Technol ›› 2003, Vol. 19 ›› Issue (04): 330-333.

• Research Articles • Previous Articles     Next Articles

Influences of Alloying Elements W, Mo, Cr and Nb on Retained Beta Phase in 47Al Based near γ-TiAl Alloys

Limin DONG, Rui YANG   

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-07-28 Published:2009-10-10
  • Contact: Limin DONG

Abstract: The influences of alloying elements W, Mo, Cr, and Nb on retained β phase in 47Al based near γ-TiAl alloys have been studied. The results reveal that the amount of retained β phase is increased by the addition of Cr, Mo, W in rising rank, although the distribution of β phase in Cr-bearing alloys is different from that of Mo- or W-bearing alloys. For Nb-doped alloys, no retainedβwas found even when 5 at.pct Nb was added. The as-cast microstructural features and the distribution of theβphase in the different alloy families were compared and interpreted in terms of the different segregation behaviour of these elements in Ti.

Key words: γ-TiAl, Alloying elements, Microstructure, Retained β phase