パルス通電焼結によるTi基形状記憶合金の創製に関する研究

概要

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Recently, the fabrication of Ti-based shape memory alloys (SMAs) has been tried using the powder metallurgy (PM) process. The fabrication conditions of Ti-based SMAs by PM process and their important shape memory characteristics for applying to the elements, however, have not been discussed enough. The target of this study is to develop Ti-based SMAs having superior shape memory characteristics by PM process. At first, the fabrication conditions and shape memory characteristics of Ti-Ni alloys were examined. Next, in order to improve the critical stress for slip deformation and the shape memory characteristics of Ti-Ni alloys, the effects of aging treatment, densification processing and addition of Cu and Zr as third elements on the shape memory characteristics were investigated. In this paper, the effects of Cu addition on phase transformation behavior and thermo-mechanical properties of Ti-Ni-Cu alloy were introduced. As a result, Ti-based SMAs having superior shape memory characteristics could be developed by establishment of fabrication conditions of the alloy by the PM process.