Anomalies in the elastic properties of metallic multilayers

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Abstract
Using variable-cell molecular dynamics, we have studied the elastic constants of the metallic multilayer system Cu/Pd with embedded-atom potentials. Planar coherency remains intact at very low repeat distances (wavelengths), and the biaxial modulus shows decreases up to about 50%. At small repeat lengths, we predict that these coherent multilayers will become soft, in agreement with recent ultrasonic experiments, but in contrast to bulge-test observations.