2007 年 48 巻 8 号 p. 2143-2147
Ti51Ni39Cu10 SMA is more suitable than Ti50Ni50 SMA for use as a high damping alloy at room temperature because it has higher inherent internal friction and wider martensitic transformation temperature range. Experimental results show that tanδ values of both (IFPT+IFI)B2→B19 and (IFPT+IFI)B19→B19′ of Ti51Ni39Cu10 SMA are linearly proportional to σ0⁄ν1⁄2 when the applied ν and σ0 are within 10 Hz and 15 μm, respectively. Since defects and dislocations pin the martensite twin boundaries and obstruct their mobility, it is important to prevent the introduction of defects or dislocations into the solution-treated Ti51Ni39Cu10 SMA to maintain its high inherent internal friction.