Damping characteristics of Ti50Ni47Fe3 alloy

Low-frequency internal friction (IF) of Ti50Ni47Fe3 alloy has been measured in the temperature range of 100–400 K, as well as the electrical resistivity and differential scanning calorimetry (DSC). Similar to other TiNi-based alloys IF of the austenitic phase (B2) is very low and almost independent of temperature, while it increases steeply at B2-R phase transformation. Then, making a sharp peak, IF decreases with decreasing temperature gradually. The peak height is around 50 × 10−3, indicating a very large damping capacity of 27%. At the Ms temperature, which appears around 100 K, IF makes a small peak associated with the phase transition. Temperature dependence of electrical resistivity and calorimetric measurement show that a two-stage phase transformation takes place, which is in accordance with the behavior of IF. It has been revealed that the Ms temperature is dependent on the solution treatment temperature.