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Elastic and nanostructural properties of Cu/Pd superlattices

Published online by Cambridge University Press:  31 January 2011

B.M. Davis ,
D.X. Li ,
D.N. Seidman ,
J.B. Ketterson ,
R. Bhadra  and
M. Grimsditch
B.M. Davis
Affiliation:
Materials Science and Engineering Department and the Materials Research Center, Robert R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208-3108
D.X. Li
Affiliation:
Materials Science and Engineering Department and the Materials Research Center, Robert R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208-3108
D.N. Seidman
Affiliation:
Materials Science and Engineering Department and the Materials Research Center, Robert R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208-3108
J.B. Ketterson
Affiliation:
Physics and Astronomy Department and the Materials Research Center, College of Arts and Sciences, Northwestern University, Evanston, Illinois 60208
R. Bhadra
Affiliation:
Materials Science Division, Building 223, Argonne National Laboratory, Argonne, Illinois 60439
M. Grimsditch
Affiliation:
Materials Science Division, Building 223, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

A series of Cu/Pd superlattices with composition modulation wavelengths (Λ's) ranging from 1.6 to 3.5 nm and a strong [111] growth texture were prepared by electron beam evaporation. The elastic properties of the films were examined using the methods of uniaxial tension tests [a Young's modulus (1/s11), where sij is an elastic compliance] with the applied load parallel to the plane of the Cu/Pd interface and Brillouin scattering [a shear modulus (1/s44) with the shear waves parallel to the plane of the Cu/Pd interface]. Also, the films were characterized using both x-ray diffraction and high-resolution electron microscopy; this was done to assess the effect of the nanostructure on a possible “supermodulus effect.” The films are nanostructurally very similar to the superlattice films employed in previous studies at Northwestern in which a supermodulus effect was reported. But, contrary to previous studies, no anomalous behavior was observed for the measured elastic properties of the thin films. Therefore the present results negate the earlier results and cast a serious doubt on the existence of a supermodulus effect.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 6 , June 1992 , pp. 1356 - 1369
Copyright
Copyright © Materials Research Society 1992

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