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. Shape memory alloys (SMAs) are attracting attention as an intelligent material. In this study, we propose a functionally-graded TiNi SMA fabricated using a combination of powder metallurgy and secondary working (1) (e.g., rolling). This advanced material can be utilized as a medical guidewire exhibiting a bending rigidity varying from low to high along the axial direction and a driving element that performs the functions of both a temperature sensor and an actuator. The powder metallurgy process can easily control the composition ratio of Ti and Ni based on elemental powders. The materials fabricated using the powder metallurgy process are generally not used under severe deformation conditions because of their poor ductility. However, the materials that can withstand such deformation conditions must be considered, especially for developing a medical guidewire from sintered TiNi SMA.

Improvement of Fatigue Property for Sintered TiNi Shape Memory Alloy by Secondary Working