This paper proposed a novel method of laser welding-brazing aluminum to titanium assisted by titanium mesh interlayer to further improve load capacity of Ti/Al joints. Experimental design method was used to study the effect of the titanium mesh on microstructure and mechanical properties of Ti/Al joints, and the specific process of Ti/Al interface reaction was revealed. The titanium mesh promoted spreading and wetting abilities of the molten aluminum on the titanium surface. Titanium dissolved into the molten aluminum and Al₃Ti intermetallic compounds layer nucleated heterogeneously on the titanium surface during Ti/Al interface reaction. Compared with joints without titanium mesh, higher Ti element content and more Al₃Ti particles were detected in the aluminum weld at joints with titanium mesh, which increased microhardness of the aluminum weld. High-density dislocations and low-angle grain boundaries were detected in the aluminum adjacent to the Al₃Ti layer, and cracks tended to initiate there. The second phase strengthening of Al₃Ti particles and larger connection area increased load capacity of the Ti/Al joints with titanium mesh. The optimal average tensile shear property of joints increased from 3.2 kN to 4.05 kN assisted by the titanium mesh, increasing by 26.6 %.

本文提出了一种钛网夹层辅助的激光焊接-钎焊铝与钛的新方法，以进一步提高钛/铝接头的承载能力。采用实验设计方法研究了钛网对Ti/Al接头显微组织和力学性能的影响，揭示了Ti/Al界面反应的具体过程。钛网促进了铝液在钛表面的铺展和润湿能力。在Ti/Al界面反应过程中，溶解在熔融铝中的钛和Al ₃ Ti金属间化合物层在钛表面非均相形核。与没有钛网的接头相比，Ti元素含量更高，Al _3更多在与钛网的接头处的铝焊缝中检测到钛颗粒，这增加了铝焊缝的显微硬度。_{在与Al 3} Ti 层相邻的铝中检测到高密度位错和小角度晶界，并且倾向于在该处产生裂纹。_{Al 3} Ti 颗粒的第二相强化和更大的连接面积增加了钛网Ti/Al接头的承载能力。在钛网的辅助下，接头的最佳平均拉伸剪切性能从 3.2 kN 提高到 4.05 kN，提高了 26.6%。