J Mater Sci Technol ›› 1996, Vol. 12 ›› Issue (6): 464-466.

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Stoichiometric NbTiAl_3 (γ1 Phase) Alloy in Ti-Al-Nb Ternary System

Jingxia CAO; Jinjun DING and Shiming HAO (Dept. of Materials Science and Technology, Northeastern University Shenyang 110006, China)(To whom correspondence should be addressed)Guoliang CHEN (Dept. of Materials Science and Technology University of Science   

  • Received:1996-11-28 Revised:1996-11-28 Online:1996-11-28 Published:2009-10-10

Abstract: The microstructure and phase constitution in stoichiometric NbTiAl3 (γ1 phase) alloy treated at 1000℃ were examined by metallography and X-ray diffraction. The alloy microstructure is mainly γ1 phase containing η second phase [(Ti,Nb)Al3] less than 1%. DTA analysis shows no phase transformation from room temperature to 1200℃. In the diffusion couple of NbTiAl3 with 7-TiAl compound, clear phase boundary and composition jump exist between γ1 and γ phase.These results further confirm the existence of γ1 single phase at 1000℃ in Ti-Al-Nb ternary system.