Abstract
The micro laser lap welding method formed a lap joint of NiTiNb shape memory alloys (SMAs) to Ti6Al4V alloy with a Ni interlayer. The microstructure and mechanical properties in the lap weld were studied by Optical microscope (OM), Scanning electron microscope (SEM), Energy dispersive spectroscopy (EDS), and tensile tests. The results show that the addition of a Ni interlayer still formed the brittle intermetallic compound Ti2Ni. Moreover, the width of the brittle intermetallic compound Ti2Ni region can reduce the crack sensitivity of the lap joint. The lap joint fractured in the fusion zone on the Ti6Al4V alloy side with a maximum shear load of 122N.
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