TiAl-Nb合金相平衡转变及显微组织结构研究

doi:10.3976/j.issn.1002-4026.2018.01.009

Abstract

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

FANG Chun-mei, XU Yong, XU Bin, YUAN Nai-qiang. Study on equilibrium phase transformation and microstructure of TiAl-Nb alloy[J].SHANDONG SCIENCE, 2018, 31(1): 48-.

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

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