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Ti 51 Ni 39 Cu 10 SMA is more suitable than Ti 50 Ni 50 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 tan δ values of both (IF PT +IF I ) B2->19 and (IF PT +IF I ) B19->B19' of Ti 51 Ni 39 Cu 10 SMA are linearly proportional to σ0/ν 1/2 when the applied v and σ0 are within 10Hz and 15μm, 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 Ti 51 Ni 39 Cu 10 SMA to maintain its high inherent internal friction.

Inherent Internal Friction of Ti<SUB>51</SUB>Ni<SUB>39</SUB>Cu<SUB>10</SUB> Shape Memory Alloy