(中南大學 粉末冶金國家重點實驗室， 長沙 410083)
摘 要: 因密度、比剛度、高溫比強度和阻燃性等方面的優(yōu)勢，TiAl基金屬間化合物被認為是最有應用潛力的新一代結構材料。室溫脆性以及延性、蠕變性能和其它性能的平衡是阻礙TiAl基合金作為高溫結構材料實際應用的主要障礙。在分析合金化對組織與性能的影響及機理、加工/熱處理對組織與性能的影響、變形和斷裂機制、顯微組織與拉伸性能的關系、抗氧化性及改善、蠕變性能與蠕變機制的基礎上，論述了TiAl基合金的工藝-顯微組織-力學性能關系。
關鍵字: TiAl基合金；工藝；顯微組織；力學性能
mechanical properties of TiAl-based alloys
（State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, P.R.China）
Abstract:Due to their advantages in density, specific rigidity, specific high temperature strength and burning resistance, the TiAl-based alloys are considered a new generation of high-temperature structural materials of the most potential applications. The brittleness at room temperature and the balances among ductility, creep resistance and other properties are the main barriers which limit the practical applications of those alloys as high-temperature structural materials. The relationships among technologies, microstructures and mechanical properties were expounded based on the analyses of the effects and mechanisms of alloying on microstructures and mechanical properties, the effects of processing/heat treatment on microstructures and mechanical properties, deformation and fracture mechanisms, microstructures and tensile properties, oxidation resistance and its improvement, and creep properties and creep mechanisms.
Key words: TiAl-based alloys; technologies; microstructures; mechanical properties
