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Mechanical properties of compositionally modulated Au-Ni thin films: Nanoindentation and microcantilever deflection experiments

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Abstract

The mechanical properties of compositionally modulated Au-Ni films were investigated by submicrometer depth-sensing indentation and by deflection of micrometer-scale cantilever beams. Films prepared by sputter deposition with composition wavelengths between 0.9 and 4.0 nm were investigated. Strength was found to be high and invariant with composition wavelength. Experimental and data analysis methods were developed to provide more accurate and precise measurements of elastic stiffness. Large enhancements in stiffness (the “supermodulus effect”) were not observed. Rather, relatively small but significant minima were observed at a composition wavelength of about 1.6 nm by both techniques. These variations were found to be strongly correlated with variations in the average lattice parameter normal to the plane of the film. Both structural and mechanical property variations are consistent with a simple model in which the film consists of bulk-like Au and Ni layers with interfaces of constant thickness.

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Author notes

  1. Shefford P. Baker

    Present address: Present address: Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft, Seestraße 92, 70174, Stuttgart, Germany

Authors and Affiliations

  1. Department of Materials Science and Engineering, Stanford University, 94305, Stanford, California, USA

    Shefford P. Baker & William D. Nix

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  1. Shefford P. Baker
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  2. William D. Nix
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Baker, S.P., Nix, W.D. Mechanical properties of compositionally modulated Au-Ni thin films: Nanoindentation and microcantilever deflection experiments. Journal of Materials Research 9, 3131–3144 (1994). https://doi.org/10.1557/JMR.1994.3131

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  • DOI: https://doi.org/10.1557/JMR.1994.3131

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