Dresden 2009 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 13: Topical Session Nanoanalytics using Small-Angle Scattering I
MM 13.1: Hauptvortrag
Dienstag, 24. März 2009, 10:15–10:45, IFW A
Small-Angle Neutron Scattering in Materials Science — •Pavel Strunz1, Debashis Mukherji2, Gerhard Schumacher3, Ralph Gilles4, and Albrecht Wiedenmann5 — 1NPI and Research Centre Řež, CZ-25068 Řež near Prague — 2TU Braunschweig, IfW, Langer Kamp 8, D-38106 Braunschweig — 3Helmholtz-Zentrum Berlin, Glienicker Str. 100, D-14109 Berlin — 4TU München, Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Lichtenbergstr. 1, D-85747 Garching — 5ILL, 6, rue Jules Horowitz, BP 156, F-38042 Grenoble Cedex 9
A complementary use of Small-Angle Neutron Scattering (SANS) can be considered for microstructural investigations. In special cases, it can even be indispensable as it provides information not accessible by other methods. Due to the low absorption of neutrons by a majority of elements, it is a suitable method for bulk characterization as well as for in-situ studies at extreme conditions. Neutrons enable relatively easy contrast variation which helps to resolve details of microstructure. A sensitivity to magnetic inhomogeneities has to be pointed out as well.
Examples taken from the research of Ni superalloys and ceramic thermal barrier coatings demonstrate the application of in-situ SANS in investigation of high-temperature materials. The evolution of precipitates in Ni-Fe-based superalloy and formation of nanopores in YSZ coating was observed. Another study employs contrast variation for characterisation of nanoparticles produced by extracting precipitates from a bulk alloy. The existence of a core-shell structure of the nanoparticles was confirmed by SANS.