通过使用高能量密度的电子束高速扫描预先涂有Si粉的TiAl合金表面, "原位"制得了以高硬度金属间化合物Ti5Si3为增强相、以TiAl、 Ti3Al为基体的复相合金表面改性层. 利用光学显微镜、电子探针、能谱仪及X射线衍射仪分析和研究了电子束表面改性层的显微组织结构; 同时测试了沿改性层深度方向的硬度分布. 结果表明: 表面改性层由TiAl、 Ti3Al、 Ti5Si3相组成, Ti5Si3相的形态及分布沿层深方向呈现梯度变化, 在表层为粗大的六棱柱状结构, 沿改性层向内, 其中、下部由于冷却速度相对较快, 硬质相的形态及分布趋于细小、密集; 改性层与基体间没有明显的界面, 为完全的冶金结合; 改性层具有较高的硬度, 显微硬度最高达到895, 约为基体的3倍.
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