Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 59: Complex Materials II

MM 59.1: Vortrag

Donnerstag, 29. März 2012, 17:00–17:15, H 1029

An atomic model for Metadislocation Motion: How do hundreds of Atoms move in a coordinated way? — •Marc Heggen and Michael Feuerbacher — Peter Grünberg Institut, Forschungszentrum Juelich GmbH, D-52425 Juelich

Metadislocations are highly complex defects which involve several hundreds of atoms in their core. We present a microstructural investigation on Metadislocations in the complex metallic alloy xi'-Al-Pd-Mn using aberration-corrected high-resolution scanning transmission electron microscopy. We show that the metadislocation core is highly ordered and based on atomic clusters. It possesses a multiscale structure with an inner core comprising the full strain of the metadislocation and an outer core which is not strained but has a modified cluster structure with respect to the bulk. A first atomic model for metadislocation motion is presented which involves the coordinated movement of hundreds of atoms along various directions.