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Abstract
Since the resistance welding technique is widely applied for joining in several metals and alloys, this may be also applicable for Ti-Ni alloys. It is also known in Ni-rich Ti-Ni alloys that the shape memory and mechanical properties depend on heat-treatment through microstructural change. In this study, the resistance-welding was applied for Ti-50.9at%Ni alloy wires with 1mm in diameter. In order to clarify the effect of heat treatment, various heat treatments were performed before and after the resistance welding. Mechanical characteristics such as fracture stress and strain were investigated by tensile tests. The fatigue life was evaluated using rotary-bending fatigue tests. Microstructural observation for welded zone and heat affected zone (HAZ) was also carried out by optical microscope and transmission electron microscope (TEM). It was found that the fracture stress of some resistance-welded wires exceeded 1GPa. Optical microscope and TEM observation revealed that microstructure near welded zone was affected by heat treatment, resulting in change of mechanical properties.
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