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

摘要/Abstract

摘要：

采用定性定量衍射检测和金相检测法分析了Ti-Al和Ti-Al-Nb合金中的物相组成和显微组织结构特征，研究Nb元素的添加对Ti-Al-Nb合金物相组成、晶粒尺寸和分布等特征的作用和影响。结果表明，Nb元素能够促进合金结构中β相和α₂相的稳定性，抑制α相的生成和γ相的析出，扩展了α₂+γ两相区并使得γ相区右移。另外，Nb元素的添加在特定的成分范围内细化了合金的晶粒。

关键词: 平衡相转变, 高Nb-TiAl合金, 显微组织结构

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

中图分类号:

TG146.2

方春梅，徐勇，许斌，袁乃强. TiAl-Nb合金相平衡转变及显微组织结构研究[J]. 山东科学, 2018, 31(1): 48-.

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-.

参考文献

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