(哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001)
摘 要: 采用Ti、Al、Nb三种元素粉末为原料，通过机械球磨和真空热压烧结方法，制备全致密的Ti-45Al-10Nb合金。研究球磨粉末形貌，烧结所得坯料的显微组织及成分分布。结果表明：机械球磨有效地细化与复合Ti、Al和Nb三种单质粉末，球磨后的粉末经1 350 ℃、2 h、50 MPa烧结得到密度为4.3 g/cm3的烧结块体，其组织为双态类型。在烧结坯中，三种元素分布均匀。
关键字: Nb-TiAl合金；元素粉末；真空热压；反应烧结；显微组织
（School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:A full dense Ti-45Al-10Nb alloy was synthesized by mechanical milling and vacuum hot pressing method with three elements: Ti, Al and Nb. The morphology of milled powders, the microstructure and the distribution of major elements of the sintered specimen were studied. The results show that Ti, Al and Nb powders are refined and well-distributed through mechanical milling. Fully dense compacts are conducted using the milled powders at 1 350 ℃ under the load of 50 MPa for 2 h. The density of the sintered alloy is measured to be 4.3 g/cm3. Elements Ti, Al and Nb distribute evenly the sintered alloy.
Key words: Nb-TiAl alloys; elemental powders; vacuum hot pressing; reaction sintering; microstructure
