利用Al和TiO2之间的放热化学反应,采用激光原位合成技术在TC4钛合金基体材料表面制备了Al2O3/Ti-Al金属间化合物基复合涂层.对比分析了激光功率、激光束扫描速度和光斑尺寸变化对激光能量密度变化量的影响程度,借助X射线衍射仪(XRD)、光学显微镜(OM)、能谱仪(EDS)和显微硬度计分别考察了激光束扫描速度对复合涂层表面宏观形貌、截面显微组织结构和显微硬度的影响.结果显示,扫描速度的变化对激光能量密度变化量的影响程度最大,光斑尺寸次之,激光功率的变化影响最弱.随着激光束扫描速度的增大,复合涂层表面渐趋粗糙,“鱼鳞纹”状形貌特征趋于明显,复合涂层与基材结合区厚度减小.激光原位复合涂层主要由k-Al2O3和α-Al2O3增强相与α-Ti和α2-Ti3Al基体相组成.随着激光束扫描速度增大,复合涂层内k-Al2O3部分转变为α-Al2O3,Al2O3增强相有由枝晶状向纤维状转变的趋势；复合涂层截面显微硬度自基体至涂层表面过度平缓,且涂层区显微硬度分布均匀,明显高于基材平均显微硬度.
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