When 9:00 AM - 10:30 AM Sep 29, 2006
Where 1670 CSE
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Processing and Mechanical Behavior of Nanocomposite Thin Films

Robert Cammarata - Johns Hopkins University

Nanocomposite materials are multiphase materials where the characteristic microstructural length scale is less than or of order 100 nm. Examples include multilayered materials with submicron individual layer thicknesses and materials composed of a matrix embedded with second phase nanospheres or nanowires. Thin film deposition methods have proven very useful in producing nanocomposites with very sensitive microstructural control. Owing to the very small structural length scale, nanocomposites often display unusual and enhanced properties compared to bulk materials that have potentially important technological applications. The deposition of metal/metal and metal/ceramic nanocomposites materials using novel electrochemical and sputtering thin film processing methods will be presented. In addition to completely crystalline systems, the materials discussed will include metallic glass multilayered films where the bilayer thickness represents a long range microstructural length scale in otherwise amorphous materials, and crystalline metal-amorphous ceramic nanoparticulate composites that display percolation effects as the metal volume fraction is varied. The mechanical behavior of the nanocomposites will be presented with the emphasis being on the properties obtained from nanoindentation methods, although examples of enhanced anelastic and fatigue behavior will also be shown.

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