(南京航空航天大学 材料科学与技术学院，南京 210016)
摘 要: 采用机械活化和粉末冶金方法制备Ti47Ni47Al6合金，通过光学显微镜、配备能谱分析的扫描电镜、X射线衍射仪、维氏硬度及抗弯强度测试手段研究机械活化对烧结合金显微组织和性能的影响。结果表明：随着球磨的进行，粉体中Ti和Ni的晶格常数增大，球磨20 h的Ti47Ni47Al6粉末形成了Ti-Ni-Al三元复合粉，但无新相形成。与球磨1 h粉末烧结制备的合金相比，球磨20 h的机械活化粉末烧结合金中Ti2Ni(Al)和Ni3Ti(Al)强化相数量、致密度、硬度及抗弯强度均增加。
关键字: Ti47Ni47Al6粉末；机械活化；烧结
（College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China）
Abstract:Ti47Ni47Al6 alloys were prepared by the mechanical activation and powder metallurgy methods, and the effects of mechanical activation on the microstructure and mechanical properties of the sintered alloys were investigated by optical microscope, scanning electron microscope equipped with an energy dispersive X-ray spectrometer, X ray diffractometer, microhardness and bending strength tests. The results indicate that the lattice constants of Ti and Ni of the powders increase with the increase of ball-milling time, and the powders ball-milled for 20 h form the Ti-Ni-Al ternary powder with no formation of new phase. Compared with the sintered alloy prepared by the powders milled for 1 h, the number of Ti2Ni(Al) and Ni3Ti(Al) strengthening phases, the relative density, the microhardness and the flexural strength all increase for the sintered alloy prepared by the mechanical activated powder milled for 20 h.
Key words: Ti47Ni47Al6 powder; mechanical activation; sintering
