When 9:30 AM - 11:00 AM Apr 23, 2009
Where 3150 HH Dow
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Materials at the Atomic scale: Insights into the Underlying Phenomena

Emmanuelle A. Marquis, University of Oxford

The ability to experimentally probe the chemical structure of materials at the atomic scale is key to ultimately control material properties, by providing information essential for the optimization of processing conditions, materials properties, and desired microstructure. In this context, atom-probe tomography is a unique technique that allows the chemical investigation of small volumes of materials with near atomic resolution, allowing the quantitative study of atomic scale phenomena. In this presentation, I will explain how the technique works, highlight its applications, and discuss current limitations and potential solutions. I will review my current research on oxide-dispersion strengthened steels, candidate structural materials for future fusion reactors. The results will illustrate how atom-probe tomography, in combination with transmission electron microscopy, can be used to characterize the three-dimensional atomic scale structure of selected alloys. The findings contribute to our understanding of the atomistic and nanoscale processes that underpin the kinetics evolution and equilibrium of solute distributions in metallic systems.

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