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The damping property tanof Cu-Al-Mn-based alloys, where tanis nearly equal to internal friction Q  1 , was investigated using a Dynamic Mechanical Spectrometer (DMS). It was found that the dependences of frequency and strain amplitude on tanare significantly different between the parent + martensite two-phase and the martensite single-phase states, i.e., tanis mainly influenced by frequency in the two-phase state and by strain amplitude in the martensite state. It was also found that the relative grain size d=D is a function of the damping capacity, where d and D are the grain diameter and the diameter of the wire, respectively, and that tanincreases with increasing d=D. The maximum values of tan  ¼ 0:54 and tan  ¼ 0:07 were obtained in the two-phase state and in the martensite state, respectively, in the specimen of d=D  1.

Damping Properties of Ductile Cu-Al-Mn-Based Shape Memory Alloys