【摘要】 为了实现Ti/Al异质界面组织结构的均匀化，在TC4钛合金表面进行了热浸镀Al-Mg5合金镀层，重点分析了工艺参数对镀层宏观形貌、Ti/Al界面特性的影响，并对Ti/Al界面的反应机理进行了研究。结果表明：在试验工艺参数下，随着热浸镀温度T的升高或保温时间t的延长，镀层逐渐变得平滑均一；固定t,镀层厚度随T的升高先减小后略有增大；固定T,镀层厚度随t的延长大致呈先增加后减少的趋势；TC4钛合金与Al-Mg5合金镀层之间仅形成一层TiAl₃;固定T,TiAl₃层厚度随t的延长逐渐增大；固定t,随着T的升高TiAl₃层不仅厚度逐渐增大，形态也发生了变化，T≤900℃时，TiAl₃层呈胞状，T≥1000℃时，TiAl₃层转变为齿状；界面处TiAl₃层的形成主要包括：铝液在钛表面润湿铺展，Ti、Al元素互扩散，TiAl₃的异质形核及TiAl₃层的持续生长4个阶段。更多还原

【Abstract】 In order to achieve uniformity of the Ti/Al heterojunction interface structure, a hot dip Al-Mg5 alloy coating was deposited on the surface of TC4 titanium alloy. The influence of process parameters on macroscopic morphology and Ti/Al interface characteristics of the coating was analyzed, and the reaction mechanism of the Ti/Al interface was studied. The results show that under the experimental process parameters, as the hot dip temperature（T） increases or the holding time（t） increases, the coating gradually becomes smooth and uniform. When t is a fixed value, the thickness of the coating decreases first and then slightly increases with the increase of T. When T is a fixed value, the thickness of the coating generally increases first and then decreases with the increase of t. Only one TiAl₃ layer is formed between the TC4 titanium alloy and the Al-Mg5 alloy coating. When T is a fixed value, the thickness of the TiAl₃ layer gradually increases with the increase of t. When t is a fixed value, as T increases, the thickness of the TiAl₃ layer gradually increases, and its morphology is also changed. When T ≤ 900 ℃, the TiAl₃ layer shows a cellular shape, and when T ≥ 1000 ℃, it transforms into a serrated shape. The formation of TiAl₃ layer at the interface mainly includes four stages: wetting and spreading of liquid aluminum on the titanium surface, interdiffusion of Ti and Al elements, heterogeneous nucleation of TiAl₃ layer at the solid-liquid interface, and continuous growth of TiAl₃ layer.更多还原