SHANDONG SCIENCE ›› 2018, Vol. 31 ›› Issue (1): 48-.doi: 10.3976/j.issn.1002-4026.2018.01.009

• New Materials • Previous Articles     Next Articles

Study on equilibrium phase transformation and microstructure of TiAl-Nb alloy

FANG Chun-mei, XU Yong*, XU Bin, YUAN Nai-qiang   

  1. School of Materials Science and Engineering, Shandong Jianzhu University,Jinan 250101, China
  • Received:2017-11-29 Online:2018-02-20 Published:2018-02-20

Abstract:

The phase composition and microstucture characteristics of Ti-Al and Ti-Al-Nb alloys were analyzed by qualitative and quantitative X-ray diffraction and optical micrscopic methods. The effects of Nb addition in Ti-Al alloys on phase composition of Ti-Al-Nb alloy, grain size and distribution were also investigated. It was found that Nb addition could dramatically improve the stability of β and α2 phases, while the precipitation of α and γ phases was hindered as Nb addition. Meanwhile, the area of α2+γ two-phase region was enlarged, and the γ phase region was made to shift to the right. Furthermore, the grain size of Ti-Al-Nb alloys was significantly refinded by Nb addition within a specific composition range.

Key words: high Nb -TiAl alloys, equilibrium phase transformations, microscopic structure

CLC Number: 

  • TG146.2