Mo对高Nb-TiAl基合金微观组织的影响  

Influence of element Mo on microstructure of TiAl based alloy with high Nb content

作　　者：王艳晶[1] 谷艳鹏 高恩志[1] 李菲[1] 王文东[1] 

机构地区：[1]沈阳航空航天大学材料科学与工程学院,沈阳110136

出　　处：《沈阳航空航天大学学报》2016年第3期47-51,共5页Journal of Shenyang Aerospace University

基　　金：国家自然科学基金(项目编号:51405310)

摘　　要：在高Nb-TiAl合金的基础上添加Mo、B合金元素,熔炼了2种合金。利用光学显微镜(OM)、扫描电镜(SEM)结合能谱分析(EDS)、X射线衍射(XRD)等手段研究了2种合金铸态和热处理后的显微组织。研究表明,Ti-45Al-7Nb-0.2B-1Mo合金的铸态组织为近层片组织,热处理后组织为全层片组织;该合金的铸态组织中包含γ相、α2相、B2相及多种钼铝化合物相,热处理后合金中B2相消失,形成了富Nb的钼化物,Mo细化了层片间距。Two kinds of alloys were melt by adding Mo and B elements into the TiAl based intermetallic compound with high Nb concent. The as-cast and heat treated microstructure of this two kinds of alloys were investigated by the optical microscope( OM),scanning electronic microscope( SEM),energy dispersive spectroscope( EDS) and X-ray diffraction( XRD). The results show that the as-cast Ti-45Al-7Nb-0. 2B-1Mo alloy has approximately lamellar microstructure and heat treated alloy has full lamellar microstructure. The as-cast microstructure of this alloy contained γ phase,α2phase,β( B2) and a variety of molybdenum compound phase. β( B2) phase disappeared after heat treatment and Nb-rich Molybdenum compound formed. Lamellar spacing decreases when element Mo is added into TiAl alloys with high Nb concent.

关 键 词：近层片组织 Mo微合金化 热处理 

分 类 号：TG146.2[一般工业技术—材料科学与工程]