(1. 北京航空航天大学材料科学与工程系， 北京 100083； 2. LM3ENSAM, P aris 75013)
摘 要: 采用增重法研究了γ-TiAl合金在1 123 K和1 173 K空气中循环氧化的动力学曲线，用配有能谱的扫描电子显微镜对氧化层的形貌和显微结构进行了分析，用X射线衍射仪测定了氧化层中的残余应力。研究结果表明：温度是影响γ-TiAl合金循环氧化性能的重要因素。氧化膜的剥落发生在金属/氧化层界面，其剥落途 径为：氧化层先脱附凸起，而后发生剥落。
关键字: TiAl； 循环氧化； 残余应力； 氧化层
（1. Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083， P.R.Chi na
2. LM3ENSAM, 151, Boulevard de I'Hopital, Paris 75013）
Abstract:The cyclic oxidation behavior of γ-TiAl in air has been studied at 1123 -TiAl in air has been studied at 1123 K and 117 K. The morphology and microstructures of the oxide scales were examine d by SEM equipped with EDS. The residual stress of oxide scale was measured by X- ray stress instrument. The results indicated that temperature is an important f actor affecting the properties of cyclic oxidation, the oxide scale spalls at interface between the metal and scale with possible mechanism of spalla tion in localised decohesion and buckling before the oxide/metal interface fail s. operties of cyclic oxidation, the oxide scale spalls at interface between the metal and scale with possible mechanism of spalla tion in localised decohesion and buckling before the oxide/metal interface fail s.
Key words: TiAl； cyclic oxidation； residual stress； oxide scale
