Viscoelasticity of stepped interfaces
SA Skirlo and MJ Demkowicz, APPLIED PHYSICS LETTERS, 103, 171908 (2013).
Using molecular dynamics modeling, we show that interfaces in sputter deposited Cu-Nb superlattices exhibit time-dependent elasticity, i.e., viscoelasticity, under shear loading. In the high temperature and small strain rate limit, the interfacial shear modulus approaches a value proportional to the density of steps in the interface. It may therefore be possible to tailor the low-frequency shear moduli of interfaces by controlling their step densities. (C) 2013 AIP Publishing LLC.
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