采用热浸镀铝和热扩散方法在TC4钛合金表面获得厚度约100μm的扩散型热浸铝层,利用金相显微镜、X射线衍射仪、扫描电子显微镜对热浸铝层的显微组织、物相及成分进行了分析。试验结果表明,热浸镀铝后进行扩散可以在TC4钛合金表面产生高硬度的TiAl3、Ti2Al5及TiAl2相的扩散层。 The hot dip aluminization and thermal diffusion method were used to obtain the diffusive hot dip aluminum layer with a thickness of about 100 μm on the surface of TC4 titanium alloy. The microstructure and the properties of the hot dip aluminum layer were characterized by means of metallographic microscope, X-ray diffraction and scanning electron microscope Phase and composition were analyzed. The experimental results show that the diffusion of hot-dip aluminized aluminum can produce high hardness TiAl3, Ti2Al5 and TiAl2 phase diffusion layer on TC4 titanium alloy.