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MM: Fachverband Metall- und Materialphysik
MM 36: Liquid and Amorphous Materials I
MM 36.3: Vortrag
Mittwoch, 20. März 2024, 12:15–12:30, C 243
Influence of structural relaxation and composition on corrosion properties of Zr-based bulk metallic glass formers — •Benedikt Schmidt1, Maximilian Frey1, Florian Schäfer2, Christian Motz2, and Ralf Busch1 — 1Chair of Metallic Materials, Saarland University, Campus C6.3, 66123 Saarbrücken, Germany — 2Chair of Materials Science and Methods, Saarland University, Campus D2.3, 66123 Saarbrücken, Germany
Bulk metallic glasses (BMGs) exhibit remarkable properties compared to crystalline alloys. They can surpass the strength of steels while also offering processability similar to polymers. Due to their amorphous structure and the resulting lack of grain boundaries, extensive attention has been directed toward the corrosion properties of these alloy systems. While previous studies have predominately focused on the comparison of the crystalline and amorphous state, the influence of structural relaxation of the glass remains poorly investigated. Through systematic sub-Tg annealing of a Zr-based BMG, we create samples with different fictive temperatures. Electrochemical analysis is performed via potentiodynamic polarization using a sodium chloride solution. We observe a consistent stability in the pitting potential, coupled with a shift of the free corrosion potential towards a more noble direction. Regarding a broader field of Zr-based systems, their corrosion mechanism is found to be mainly governed by selective corrosion as in case of the dezincification of brass. Notably, nickel emerges as a significantly influencing element in corrosion inhibition within these systems.
Keywords: Bulk metallic glasses; Corrosion; Electrochemistry; Structural relaxation; Zirconium alloy