抄録
Ti-Ni shape memory alloy (SMA) is a functional material applied to various fields. This alloy has been applied in the thermal engine, actuator for micro robot, fishing line and dental corrective devices. In general, shape memory treatments were carried out by electric furnace. If using the current heat treatment with a view to improving a shape memory heat treatment, SMA has a much boarder range of application. This study explored the effects of the electric current heat treatment on the shape memory behavior. Ti-Ni thin wires with diameters of0.3mm were made by melting ingot followed by drawing the wires. The composition of this wire was Ti-50.2at%Ni. These wires were electric current heat treated at 8V 0.7A and 16V 1.7A in the range of 5 minutes, 15 minutes and 30 minutes respectively. The transformation temperatures were measured by a Differential Scanning Calorimeter (DSC) during cooling and heating. Mechanical properties were measured by a tensile machine. From DSC measurement, all specimens were appeared shape memory effect. From stress - strain measurement, the best current heat treatment condition is 8V-30 minutes.
