When 3:30 PM - 5:00 PM Jan 29, 2010
Where 1670 CSE
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Dislocation Behavior in Metals


Ian Robertson, University of Illinois at Urbana-Champaign

 

Transmission electron microscopes have played a critical role in building our knowledge base of the atomic structure and composition as well as the electronic and magnetic state of materials.  This information is a snapshot of the material state and required a posteriori analysis to reveal the reaction or processing pathway, or to correlate with a macroscopic property.  However, it is possible to overcome this restriction and to use the electron microscope for time-resolved studies such that reaction pathways and processes are observed dynamically and at high spatial resolution.  In this talk, I will demonstrate how this approach when applied to the study of deformation processes in metals has yielded a wealth of new information about how dislocations interact with each other and with two- and three-dimensional defects.   This information can be used to inform the development of constitutive relationships to predict the mechanical properties of new materials for next generation energy production systems.  Recent progress in this area will be highlighted through prediction of mechanical properties of a pure metal and of the degradation of properties of irradiated structural materials.  Finally, recent exciting developments in time-resolved TEM studies and the impact they will have on the field will be described.

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