Damping Characteristics of Biomedical Porous NiTi Shape Memory Alloy
One internal friction peak associated with the B2↔B19’ transformation appears on the cooling curve of porous NiTi shape memory alloy and the dense NiTi alloy shows the maximum peak. The tan δ value increased with the increasing of strain amplitude and the decreasing of frequency. Tan δ value of porous alloy mainly comes from the energy absorbing of the matrix at the small strain amplitude, however, if the strain amplitude is large, the tan δ value comes from the energy consumption that overcomes the friction between folds and the plastic contribution.
Zhengyi Jiang and Chunliang Zhang
H. C. Jiang et al., "Damping Characteristics of Biomedical Porous NiTi Shape Memory Alloy", Advanced Materials Research, Vols. 97-101, pp. 1083-1086, 2010