SKM 2021 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 5: Topical Session Interface Dominated Phenomena - Poster
MM 5.4: Poster
Dienstag, 28. September 2021, 10:00–12:45, P
Grain boundary segregation and precipitation in an Al-Zn-Mg-Cu alloy — •Huan Zhao1, Baptiste Gault1,2, Liam Huber1, Wenjun Lu1, Nicolas Peter1, Dirk Ponge1, and Dierk Raabe1 — 1Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany — 2Department of Materials, Royal School of Mines, Imperial College London, London, United Kingdom
High-strength Al-Zn-Mg-Cu alloys are highly susceptible to intergranular embrittlement, which severely limits their lifetime. In this talk, I will present our recent work on the effect of solute segregation in the precipitation behavior at grain boundaries (GBs) compared to grain interiors. Solute segregation could accelerate the precipitation behavior at GBs, which causes the formation of coarse precipitates and precipitate free zones along GBs. Furthermore, the interplay of solute segregation and the local structure at GBs has been considered. We show that faceting occurs at GBs and that the distinct segregation and precipitation behavior occurs within the same GB. Investigations on the solute distribution inside the precipitates, matrix, and at GBs related to SCC resistance in Al-Zn-Mg-Cu alloys will also be discussed.