Frequency-dependent mechanical damping in alloys

R Ranganathan and YF Shi and P Keblinski, PHYSICAL REVIEW B, 95, 214112 (2017).

DOI: 10.1103/PhysRevB.95.214112

We perform oscillatory shear simulations to determine the loss modulus for three solids with identical interaction yet distinct structures: ordered, random, and glassy alloys. Random and glassy alloys show more pronounced high-frequency loss in the THz regime than the ordered alloy. Ordered and random alloys exhibit a power-law decay in damping strength as frequency decreases over nearly five decades. Glassy alloy, with a limited frequency range of power-law decay, retains significant damping at low frequencies extending down to similar to 100MHz due to slow irreversible deformation of local clusters.

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