Ti 50 Ni 50-x Cu x ( x=0, 5, 10, 15 at) fine fibers(diameter=q80 mm, length=20 cm~1 m) were successfully developed by the arc melted rapid solidification method. It has been very difficult to do the conventional melt work processing from the bulk material of this alloy to very fine fiber because of the brittleness of the especially in the range of Cu≧8 at. The fibers showed good shape memory effect. As Cu content increased, the temperature hysteresis(=Af Mf) of recovery strain temperature curves as well as that in the DSC curves became smaller. The tensile strength showed more than 1000 MPa in Ti 50 Ni 40 Cu 10 at. Therefore, the developed rapid solidified, thermoelastic fine fiber actuator/sensor materials have high potential for applications for micro machines and the fillers of smart composites.
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