Design and property control of Ti-M-O high damping alloys

Point defects in a crystalline solid can generate a time-dependent strain under the application of an external stress due to the reorientation of the point defects. This so-called Snoek effect is first applied to develop high damping alloys in bcc based alloys. It is experimentally confirmed that β-Ti alloys show high damping capacity in the temperature range of 473-573 K when a certain amount of oxygen is alloyed in solid solution state. The damping behavior is attributed to the strain relaxation process of oxygen in the bcc structured alloy. Both the damping capacity and the temperature range where the damping peaks occur depend on the composition of the base Ti alloy, as well as the oxygen content. Since the damping behavior of this new type of damping alloy is dictated by the relaxation processes of interstitial solute in the bcc lattice, composition design is essential in order to control the temperature dependent damping behavior