| Damping of aluminum-indium alloys with up to 16 wt. % indium was characterized. In the nominally strain amplitude-independent regime, the room-temperature damping initially decreased with the addition of indium and showed a minimum at 10 wt. %. For these alloys, the damping was modeled using a diffusion controlled dislocation relaxation model for the high-temperature background and a general expression for multiphase materials was given. For indium contents greater than 10 wt. %, a relaxation peak at 25;Melting transformation of indium particles (1-20 ;A general theoretical model was proposed that predicted the internal friction associated with a first order transformation of the embedded particles. This model relates the internal friction with the rate of transformation, stresses acting upon the transforming particles, and the relaxational characteristics of the surrounding matrix. |
