中文摘要：

γ-TiAl基金属间化合物具有良好的高温力学性能，密度仅为目前广泛应用的镍基高温合金的1／2左右，因而是很有应用前景的航空材料。γ-TiAl的主要弱点之一是抗高温氧化能力差，特别是在800℃以上，氧化更为严重。此外，γ-TiAl的硬度较低，摩擦学性能较差。解决这些问题的有效途径是表面改性处理。介绍了目前针对γ-TiAl的表面改性技术研究现状，结合改性效果及机理评述了各类技术的优势与局限。

英文摘要：

γ-TiAl intermetallics possesse superb high temperature mechanical properties and very low density, and is believed to be the potential substitute to nickel-base super alloys which are widely used as high temperature structural materials in aero-industry currently. A major drawback of γ-TiAl is insufficient oxidation resistance at high temperature, especially above 800℃. Besides, the tribological performance of γ-TiAl is also tmsatisfactory. Surface modification is feasible solution to these problems. In this paper, a review of studies on surface modification of γ-TiAl is presented and comments are made about various processes on the basis of modification effects and mechanisms.