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Coherency Strain Modeling of Elastic Moduli in CU/NB Multilayers

Published online by Cambridge University Press:  28 February 2011

A. F. Jankowski
A. F. Jankowski*
Affiliation:
Lawrence Livermore National Laboratory, Chemistry and Materials Science, P.O. Box 808, Livermore, California 94550
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Abstract

An anomalous decrease in the elastic moduli of Cu/Nb multilayers has been observed via acoustic wave measurements. The decrease occurs for (111) fcc Cu and (110) bcc Nb layered structures with repeat periods between 1 and 5 nm. The coherency strain model has been used to simulate modulus enhancement in noble/transition metal multilayers. This approach addresses the atomic displacements corresponding with the lattice distortions of biaxially stressed layers. Elastic moduli are derived with respect to higher order differentials of a Born-Mayer type potential for nearest neighbor ions. The elastic moduli anomalies of Cu/Nb multilayers will be modelled within this conceptual framework.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 141: Symposium T – Atomic Scale Calculations in Materials Science , 1988 , 147
Copyright
Copyright © Materials Research Society 1989

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