Dresden 2020 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 30: Poster Session II

MM 30.1: Poster

Dienstag, 17. März 2020, 18:15–20:00, P4

The interplay of geometry and chemistry at Al grain boundaries: insight from atomistics — Liam Huber, •Poulami Chakraborty, Huan Zhao, Baptiste Gault, Dierk Raabe, and Joerg Neugebauer — Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf

Metallic microstructures evolve towards configurations which minimize their free energy. At the mesoscopic scale this involves the coarsening of the polycrystalline grain structure to minimize interfacial energy, but at a finer scale this interface energy can also be reduced through the formation of facets and by solute segregation. Experimental evidence from an Al-Zn-Mg-Cu alloy shows faceting of grain boundaries in this system, and a strong correlation between the grain boundary facet (i.e. geometry) and local chemistry. Using atomistic simulations, we investigate the underlying nano-scale interactions which lead to these facet-specific behaviours. A special focus is placed on the relationship between GB segregation states, which we call `defect phases' when they are thermodynamically (meta)stable, and precipitate structure to give insight into precipitate formation in this system.