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Microstructures and Mechanical Properties of Sputtered Cu/Cr Multilayers

Published online by Cambridge University Press:  10 February 2011

A. Misra,
H. Kung,
T. E. Mitchell,
T. R. Jervis and
M. Nastasi
A. Misra
Affiliation:
Los Alamos National Laboratory, MS K765, Los Alamos, NM 87545.
H. Kung
Affiliation:
Los Alamos National Laboratory, MS K765, Los Alamos, NM 87545.
T. E. Mitchell
Affiliation:
Los Alamos National Laboratory, MS K765, Los Alamos, NM 87545.
T. R. Jervis
Affiliation:
Los Alamos National Laboratory, MS K765, Los Alamos, NM 87545.
M. Nastasi
Affiliation:
Los Alamos National Laboratory, MS K765, Los Alamos, NM 87545.
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Abstract

The microstructures and mechanical properties of Cu/Cr multilayers prepared by sputtering onto {100} Si substrates at room temperature are presented. The films exhibit columnar grain microstructures with nanoscale grain sizes. The interfaces are planar and abrupt with no intermixing, as expected from the phase diagram. The multilayers tend to adopt a Kurdjumov- Sachs (KS) orientation relationship: {110}Cr //{111}Cu, <111>Cr //<110>Cu. The hardness of the multilayered structures, as measured by nanoindentation, increase with decreasing layer thickness for layer thicknesses ranging from 200 nm to 50 nm, whereas for lower thicknesses the hardness of the multilayers is independent of the layer thickness. Dislocation-based models are used to interpret the variation of hardness with layer periodicity. The possible effects of factors such as grain size within the layers, density and composition of films and residual stress in the multilayers are highlighted. Comparisons are made to the mechanical properties of sputtered polycrystalline Cu/Nb multilayers which, like Cu/Cr, exhibit sharp fcc/bcc interfaces with no intermixing and a KS orientation relationship, but have a small shear modulus mismatch.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 505 , 1997, 583
Copyright
Copyright © Materials Research Society 1998

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