【摘要】 Ti6Al4V钛合金是航空器中燕尾榫等构件的常用材料，面临高温域的服役环境。为研究微弧氧化（MAO）对Ti6Al4V钛合金在高温域下抗微动磨损能力的影响，采用微弧氧化在Ti6Al4V表面制备了氧化涂层，使用扫描电子显微镜（SEM）以及X射线衍射仪（XRD）对MAO涂层的微观结构和物相组成进行了表征分析，开展了300℃条件下微动磨损试验，获取了摩擦系数、磨损轮廓及微观磨损损伤形貌等。结果表明：MAO处理后Ti6Al4V表面形成厚度约10μm的涂层，涂层内产生硬质的Al₂TiO₅以及金红石TiO₂相。与未处理试样相比，在不同位移条件下MAO处理试样的摩擦系数、磨损体积均更低，这说明MAO改善了高温域下Ti6Al4V的微动摩擦和磨损行为。涂层硬度的增加有利于提升耐磨能力，此外，在高温环境下，MAO涂层表面更易形成致密的TiO₂和Fe₂O₃氧化膜层，可对基体形成保护作用。MAO涂层的磨损机制主要为剥层磨损和磨粒磨损，钛合金基体的磨损机制主要为疲劳磨损和黏着磨损。更多还原

【Abstract】 Ti6Al4V titanium alloy is a commonly used material for components such as dovetail joints in aircraft, which must endure high-temperature service environments. In order to investigate the influence of micro-arc oxidation（MAO） on the fretting wear resistance of Ti6Al4V titanium alloy in the high-temperature range, oxide coatings were prepared on the surface of Ti6Al4V. The microstructure and phase composition of the MAO coatings were characterized using scanning electron microscopy（SEM） and X-ray diffractometer（XRD）. Fretting wear tests were conducted at 300 ℃ to obtain the friction coefficient, wear profiles and microscopic wear damage morphology. Results showed that after MAO treatment, a coating with a thickness of about 10 μm formed on the surface of Ti6Al4V, containing hard Al₂TiO₅ and rutile TiO₂ phases. Compared to untreated specimens, the MAO-treated samples exhibited lower friction coefficients and reduced wear volumes under various displacement conditions, demonstrating that MAO effectively improved the fretting friction and wear behavior of Ti6Al4V in the high-temperature range. Increased coating hardness was conducive to enhanced wear resistance. Additionally, under high-temperature conditions, dense TiO₂ and Fe₂O₃ oxide films were more likely to form on the MAO-coated surface, providing protection to the substrate. Besides, the wear mechanism of the MAO coating was primarily delamination wear and abrasive wear, while the titanium alloy substrate mainly underwent fatigue wear and adhesive wear.更多还原