Effect of pre-deformation on damping capacity of TiNi/NbTi composite

The present work aims to investigate the internal friction and effect of pre-deformation on damping capacity of Nb₆₀Ti₂₅Ni ₁₅ alloy, which could be considered as TiNi/NbTi metal matrix composite. The internal friction results showed that this composite possesses excellent damping behavior, which is associated with the movement of a set of abundant interfaces, such as those between the TiNi and NbTi phases, those between martensitic variants and those between martensite and parent phase. Meanwhile, the peak temperature and the width of the internal peak increased with increasing of prestrain level. It appears to be due to the release of the stored elastic strain energy, or the pinning effect by the deformed structures. Furthermore, the height of internal friction peak decreased as the prestrain level increased.