TiAl-Nb合金相平衡转变及显微组织结构研究  

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

作　　者：方春梅 徐勇[1] 许斌[1] 袁乃强 

机构地区：[1]山东建筑大学材料科学与工程学院,山东济南250101

出　　处：《山东科学》2018年第1期48-54,共7页Shandong Science

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α_2相的稳定性,抑制α相的生成和γ相的析出,扩展了α_2+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。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 a 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.

关 键 词：高Nb-TiAl合金:平衡相转变 显微组织结构 

分 类 号：TG146.2[一般工业技术—材料科学与工程]