J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (06): 814-818.

• Articles • Previous Articles     Next Articles

Solidification Features of Ti45Al Alloys with Different Boron Addition

Weidong Wang, Yingche Ma, Bo Chen, Ming Gao, Kui Liu, Yiyi Li   

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2008-09-12 Revised:2009-04-10 Online:2009-11-28 Published:2009-11-24
  • Contact: Weidong Wang

Abstract:

The effects of boron on the solidification behaviors of Ti45AlxB alloys were studied by high temperature samples. These samples were melted at 1823 K, followed by cooling to the designated temperature, and then quickly water-quenched to preserve the solidification features. Optical microscopy and scanning electron microscopy analysis shows that the solidus temperature of Ti45Al was really reduced by 20 K when adding 0.8 at. pct B, and it was also observed that boride precipitated before the appearance of β phase. Besides, solidification structure confirmed that B addition does not obviously refine β phase. α grain refinement by certain amount of B in alloy probably clarifies the mechanism of B refining lamellar microstructure at room temperature.

Key words: Titanium aluminides, Phase transformation, Boron