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MM: Fachverband Metall- und Materialphysik

MM 58: Topical Session Modern Atom Probe Tomography VI - Ordering, Clustering and Segregation

MM 58.1: Vortrag

Donnerstag, 29. März 2012, 17:00–17:15, H 0107

Atom Probe Tomography Analysis of Local Chemistry Fluctuations in Fe-based Alloys Affecting Bulk Deformation Behaviour — •Ross Marceau, Pyuck-Pa Choi, and Dierk Raabe — Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany

The solute architecture within an alloy solid solution is increasingly recognised as a key factor in engineering the evolution of microstructure. Improved performance of advanced materials requires better understanding of how the structure and chemistry at the nanometre scale impact the overall properties, however the challenge is that characterising atomistic-level structures pushes the limits of resolution and detection of most microscopy techniques. Atom probe tomography (APT) provides a unique combination of highly resolved atomistic information, both chemically and spatially in three dimensions, which can be data-mined for quantitative nanostructural information that can be seeded directly into computer simulations to predict bulk material properties of industrially significant materials.

This project is designed in the context of high-Mn TWIP steel and a model Fe-Al intermetallic alloy, where the aim of this work is to quantitatively identify fluctuations in local chemistry using state-of-the-art analysis techniques to discern fine-scale atomic clustering/segregation phenomena. These fluctuations in local composition include short-range ordering (SRO); reputed to affect the local stacking-fault energy (SFE) of the material and thus also local and global deformation pathways.