When 3:30 PM - 5:00 PM Nov 04, 2011
Where 1670 CSE
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Daniel Gianola, Materials Science and Engineering, University of Pennsylvania

Deformation at the Nanoscale: Pushing the Limits of Strength

Experimentally approaching the theoretical strength of materials has been the holy grail of structural materials research and development.  However, most engineering materials fail before reaching even a small fraction of this upper limit.  This talk will present experiments on a new class of materials, the ultra-strength, which have the capability of withstanding specimen-wide mechanical stresses that approach the theoretical limit – the maximum achievable stress in crystalline materials – and represent a new frontier of materials design.  Nanoscale “bottom-up” synthesis creates small volumes of materials and provides the high crystalline quality that allow for these mechanically extreme environments. However, the mechanisms that accommodate plastic deformation are not known, limiting our ability to tailor the properties of nanostructured materials in next generation technological devices that are subject to extreme mechanical and thermal duress.

Recent progress in the area of in situ electron microscopy (scanning and transmission) has allowed for quantitative interrogations of the deformation of nanoscale materials. Selected experiments will be presented to illustrate how these techniques can directly correlate underlying physical phenomena with measured properties.

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