Two well-formed TC4/AlSi12 bimetallic structures with good appearance formed by different process parameters were successfully prepared via laser deposition melting (LDM) technique. The microstructure and phase composition of TC4/AlSi12 BS were comparatively analyzed, and the tensile strength tests were also carried out. The results show that the thickness of the intermetallic compound (IMC) layer in the transition zone of TC4/AlSi12 BS became significantly thinner with the decrease of heat input, and the IMC of Sample 2 was drastically reduced to about 5 μm as compared with that of Sample 1 (about 100 μm). The ultra-thin IMC layer effectively suppressed the crack susceptibility of the transition zone and, at the same time, led to a substantial increase in the bond strength. The tensile strength of Sample 2 (~ 183 MPa) was increased by about three times compared to Sample 1 (56 MPa). The fracture location of Sample 1 was in the transition zone, while Sample 2 fractured in the AlSi12 deposition layer of TC4/AlSi12 BS. It is demonstrated that the LDM technique can realize good metallurgical bonding in the transition zone of TC4/AlSi12 BS with a very low dilution rate, providing a new and reliable fabrication method for Ti/Al BS, especially for complex structures.

采用激光沉积熔化（LDM）技术成功制备了两种采用不同工艺参数形成的形状良好、外观良好的TC4/AlSi12双金属结构。对TC4/AlSi12 BS的显微组织和相组成进行了对比分析，并进行了拉伸强度测试。结果表明，随着热输入的减小，TC4/AlSi12 BS过渡区的金属间化合物（IMC）层厚度明显变薄，样品2的IMC较之样品2大幅降低至5 μm左右。样品1（约100μm）。超薄IMC层有效抑制了过渡区的裂纹敏感性，同时导致结合强度大幅提高。与样品 1 (56 MPa) 相比，样品 2 (~ 183 MPa) 的拉伸强度增加了约三倍。样品1断裂位置在过渡区，样品2断裂在TC4/AlSi12 BS的AlSi12沉积层中。结果表明，LDM技术可以在极低的稀释率下在TC4/AlSi12 BS的过渡区实现良好的冶金结合，为Ti/Al BS，特别是复杂结构的Ti/Al BS提供一种新的、可靠的制造方法。