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21. januar 2019 ob 12:00, Kolarjeva predavalnica

 

High-resolution transmission electron microscopy and spectroscopy of core/shell nanostructures


Vladimir Radmilovic

National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, University of California, ZDA
Nanotechnology and Functional Materials Center, Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia

Abstract:
This presentation will illustrate the importance of understanding the fundamental features that underlie the behavior of nanoscale phases embedded in a solid matrix and their role in the evolution of microstructure in materials. Because of the scale and nature of such microstructures, electron microscopy is an essential tool in their characterization. The fundamental principles established using model alloy systems are employed in the design and testing of new materials such as Al-based alloys of interest for energy-related technologies. The effect of Li addition on core/shell precipitate formation in the ternary AlLiSc alloys has been studied by a range of advanced microscopy and spectroscopy techniques such as Atom probe thomography (APT), Energy filtered TEM spectrum imaging (EFTEM SI), EELS mapping, aberration corrected HAADF and HRTEM imaging, etc., combined with the first principle calculation.  For the ternary AlLiSc alloy we show a way of producing a uniform distribution of monodisperse Al3(LiSc) core/shell inclusions in an Al matrix. This approach to generating monodisperse precipitate distributions can be applied to range of alloys and could lead to new types of dispersion-strengthened materials.

 

comments & suggestions to:  sanja fidler