(1. 北京航空航天大學(xué)材料科學(xué)與工程系， 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空氣中循環(huán)氧化的動(dòng)力學(xué)曲線，用配有能譜的掃描電子顯微鏡對(duì)氧化層的形貌和顯微結(jié)構(gòu)進(jìn)行了分析，用X射線衍射儀測(cè)定了氧化層中的殘余應(yīng)力。研究結(jié)果表明：溫度是影響?yīng)?TiAl合金循環(huán)氧化性能的重要因素。氧化膜的剝落發(fā)生在金屬/氧化層界面，其剝落途 徑為：氧化層先脫附凸起，而后發(fā)生剝落。
關(guān)鍵字: TiAl； 循環(huán)氧化； 殘余應(yīng)力； 氧化層
Vicent. Ji2
（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
