Anomalous nonlinearity parameters of solids at low acoustic drive amplitudes

Yost, William T.; Cantrell, John H.
January 2009
Applied Physics Letters;1/12/2009, Vol. 94 Issue 2, pN.PAG
Academic Journal
Measurements of the nonlinearity parameter β as a function of acoustic drive amplitude are reported for polycrystalline aluminum alloy 2024, IN100 nickel-base superalloy, and monocrystalline Al[110]. The measurements show that the variations in β reported by [Barnard, Appl. Phys. Lett. 74, 2447 (1999)] result from the influence of the Peierls barrier on dislocation motion in the material. The dislocation motion is responsible not only for the hooklike behavior at the low drive amplitudes reported by Barnard but also for an oscillatory dependence of β at larger drive amplitudes not previously reported.


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