Physical Properties of Rapidly Solidified Ti-Pd-Ni Shape Memory Alloys

Abstract

Shape memory ally Ti-Pd-Ni films were made by the melt spinning apparatus with a single roll of rapid solidification method. Obtained specimens were ribbon shaped films, 20∿30μm in thickness and 1mm in width. The structures of the surfaces were observed by an optical microscope. The crystal structures at various temperatures were studied by the X-ray diffraction. Preferred crystal orientation was observed in these films. The martensitic and the reverse martensitic transformation temperatures were determined by the temperature changes of X-ray diffraction patterns and a differential scanning calorimeter. These transformation temperatures were lower than that of bulk specimens. After annealing at 800℃, these transformation temperatures did not increase up to that of bulk specimens.