(南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院，南京 210016)
摘 要: 采用機械活化和粉末冶金方法制備Ti47Ni47Al6合金，通過光學(xué)顯微鏡、配備能譜分析的掃描電鏡、X射線衍射儀、維氏硬度及抗彎強度測試手段研究機械活化對燒結(jié)合金顯微組織和性能的影響。結(jié)果表明：隨著球磨的進行，粉體中Ti和Ni的晶格常數(shù)增大，球磨20 h的Ti47Ni47Al6粉末形成了Ti-Ni-Al三元復(fù)合粉，但無新相形成。與球磨1 h粉末燒結(jié)制備的合金相比，球磨20 h的機械活化粉末燒結(jié)合金中Ti2Ni(Al)和Ni3Ti(Al)強化相數(shù)量、致密度、硬度及抗彎強度均增加。
關(guān)鍵字: Ti47Ni47Al6粉末；機械活化；燒結(jié)
（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
