Damping and transformation behaviors of Ti50(Pd50−xCrx) shape memory alloys with x ranging from 4.0 to 5.0.

The damping and transformation behaviors of Ti 50 (Pd 50− x Cr x ) shape memory alloys with x ranging from 4.0 to 5.0 are systematically investigated. The damping capacity (Q −1 ) at the martensitic transformation is found to be inversely proportional to the square root of frequency, i.e., Q −1 ∝ ω −0.5 . A relaxation peak or shoulder is observed slightly below the martensitic transformation damping peak for compositions within the compositional crossover region (4.5 ⩽ x ⩽ 4.8). Furthermore, the damping capacity at the martensitic transformation is smaller within the compositional crossover region (4.5 ⩽ x ⩽ 4.8), compared with that of compositions at both sides ( x = 4.0 and x = 5.0 ). These observations can be ascribed to the hysteretic motion of interfaces between different phases near the compositional crossover region. [ABSTRACT FROM AUTHOR]