High strength solid-state welds are demonstrated between NiTi shape memory alloy (SMA) and 436 stainless steel (SS) through Vaporizing Foil Actuator Welding (VFAW) method. This process uses the rapid ablation of a foil in a lab-scale process that is similar to explosive welding. The welding process characteristics including collision speed and angle were estimated using an optical method, Photon Doppler Velocimetry (PDV). The local microstructure had strong spatial variation along the weld. The first area to impact, the center of the structure does not weld, as impact is at a normal inclination. This center region has the highest collision speed, but lowest angle; moving outward collision speed decreases and impact angle increases. This causes a progression of varied weld morphologies. Transmission Electron Microscopy shows that some regions that locally melted solidified as amorphous zones. This corresponds to the Thermo-Calc calculations which also predict a high glass forming potential in the resulting multi-component alloy. While the local structure is heterogeneous from varied features across the entire span of the weld (over millimeters) to thin amorphous layers, they exhibit much higher joint efficiency than traditional welding technologies. This work sets a foundation to design processes to harness this high joint strength available through impact welding with other weld morphologies.

NiTi形状记忆合金（SMA）与436不锈钢（SS）之间的高强度固态焊缝通过汽相箔致动器焊接（VFAW）方法得到了证明。该过程在实验室规模的过程中使用箔的快速烧蚀，类似于爆炸焊接。使用光学方法光子多普勒测速仪（PDV）估算了包括碰撞速度和角度在内的焊接工艺特性。局部显微组织沿焊缝的空间变化很大。冲击的第一个区域是结构的中心，不会焊接，因为冲击处于法向倾斜状态。该中心区域具有最高的碰撞速度，但具有最小的角度；向外移动时碰撞速度降低，冲击角增加。这导致变化的焊缝形态。透射电子显微镜显示，一些局部熔化的区域固化为非晶区。这对应于Thermo-Calc计算，该计算还预测了所得多组分合金中的高玻璃形成潜力。尽管局部结构是异质的，从整个焊缝（超过几毫米）到薄的非晶层的各种特征，它们的结合效率都比传统焊接技术高得多。这项工作为设计过程奠定了基础，以利用通过冲击焊与其他焊缝形态获得的这种高接头强度。尽管局部结构是异质的，从整个焊接跨度（超过毫米）到薄的非晶层的各种特征，它们的结合效率都比传统焊接技术高得多。这项工作为设计过程奠定了基础，以利用通过冲击焊与其他焊缝形态获得的这种高接头强度。尽管局部结构是异质的，从整个焊接跨度（超过毫米）到薄的非晶层的各种特征，它们的结合效率都比传统焊接技术高得多。这项工作为设计过程奠定了基础，以利用通过冲击焊与其他焊缝形态获得的这种高接头强度。