Pure-Al, Al-5Si, and Al-12Si were selected as filler materials in dual-spot laser welded-brazed Ti/Al joints to investigate the influence of Si content on interfacial reactions and mechanical properties. The microscale and nanoscale structures of the interfacial intermetallic compound (IMC) were analyzed by transmission electron microscopy (TEM). The IMC phase at the brazing interface in joints with pure-Al was only TiAl₃ with twin structure defects and stacking faults. Ti(Al,Si)₃ and nano-granular Ti₇Al₅Si₁₂, Ti₅Si₃ phases were produced at brazing interfaces in joints with Al-5Si and Al-12Si. There were orientation relationships (OR) between Ti₇Al₅Si₁₂ and Ti(Al,Si)₃, Ti₅Si₃ and Ti₇Al₅Si₁₂. The interfacial reactions were clarified using TEM images and thermodynamic calculations. The formation mechanism of nano-granular phases in joints with Al-5Si and Al-12Si was determined to proceed via a mechanism that included direct reactions and precipitation. The chemical potential of Si (μ_Si) decreased as the Ti content increased, resulting in the aggregation of Si atoms at the brazing interface. The fracture load of joint was improved by the addition of Si element in filler metal.

在双点激光焊接钎焊Ti / Al接头中，选择纯Al，Al-5Si和Al-12Si作为填充材料，以研究Si含量对界面反应和力学性能的影响。通过透射电子显微镜（TEM）分析了界面金属间化合物（IMC）的微观和纳米结构。纯Al接头在钎焊界面处的IMC相仅是具有孪生组织缺陷和堆垛层错的TiAl ₃。在与Al-5Si和Al-12Si的接合处的钎焊界面处产生了Ti（Al，Si）₃和纳米颗粒的Ti ₇ Al ₅ Si ₁₂，Ti ₅ Si ₃相。Ti之间存在取向关系（OR）₇ Al ₅ Si ₁₂和Ti（Al，Si）₃，Ti ₅ Si ₃和Ti ₇ Al ₅ Si ₁₂。使用TEM图像和热力学计算来澄清界面反应。确定了与Al-5Si和Al-12Si的接头中的纳米颗粒相的形成机理是通过包括直接反应和沉淀的机理进行的。的Si（的化学势μ_的Si作为Ti含量增加，导致的Si原子中的钎焊界面聚合）降低。通过在填充金属中添加硅元素来​​改善接头的断裂载荷。