Clarification of Mechanical and Metallurgical Properties of Ti-Ni Shape Memory Alloy Produced by Centrifugal Casting After Self-propagating High-temperature Synthesis

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Ti-Ni alloy is a functional material that has shape memory effect and superelasticity. This alloy widely used in industrial and bio-medical fields. However, almost all applications are limited to the use as wire or thin plate, because Ti-Ni alloy has two big problems of little processability and gravity segregation in casting. From above-mentioned point of view, in this research project, we adopted a self-propagating high-temperature synthesis (SHS) for making an ingot of Ti-Ni alloy without the gravity segregation, and tried to a centrifugal casting for making arbitrarily-shaped products. The mechanical properties (shape memory effect, superelastic property, and so on) of Ti-Ni alloy made by this new method were investigated by systematic experiments. Furthermore, in order to confirm these mechanical properties, the metallurgical properties (transformation temperature, crystallinity, and so on) were measured by differential scanning calorimeter (DSC) and X-ray diffraction (XRD). From these results, it was considered that Ti-Ni alloy manufactured by the centrifugal casting after the SHS could be used for practical applications, and that Ti-Ni SMA products with arbitrarily shape were realized by using this method.