Regensburg 1998 – wissenschaftliches Programm
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M: Metallphysik
M 1: Hauptvortrag (D. Blavette)
M 1.1: Hauptvortrag
Montag, 23. März 1998, 09:30–10:00, H 38
Three-dimensional atomic tomography in Physical Metallurgy — •Didier Blavette — Universite de Rouen 76821 Mont Saint Aignan Cèdex, France
Since their invention by E.W Mueller in 1967, atom-probe techniques have been used extensively in Material Science. The recent emergence of a new generation of apparatus, namely the three-dimensional atom-probe, has been a decisive projection, the Tomographic Atom-Probe (TAP) being the French version of this new type of analytical microscopy. Chemical species in a small volume of the material, typically 10x10x100 nm3, can be mapped out in the three dimensions of real space, with a lateral resolution (parallel to the specimen surface) of a few tenth nanometer. The depth resolution is close to one tenth of a nanometer. The TAP is therefore able to image atomic planes within the analysed volume and therefore to map out the order field. With this new generation of instrument, both the composition and the order fields can be combined with topological information related to the imaged nanostructure on a near-atomic scale and in 3D. The application of the Tomographic Atom-Probe in the study of the transformation paths in unmixing and ordering transformations as well as in the investigation of interfacial segregation phenomena will be illustrated and discussed.