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MM: Fachverband Metall- und Materialphysik
MM 53: Liquid and Amorphous Metals
MM 53.4: Vortrag
Donnerstag, 15. März 2018, 11:00–11:15, TC 010
Consolidation of amorphous powder by thermoplastic forming and subsequent mechanical testing — •Benedikt Bochtler1, Moritz Stolpe1,2, Benedikt Reiplinger1, and Ralf Busch1 — 1Lehrstuhl für Metallische Werkstoffe, Universität des Saarlandes, Saarbrücken, Germany — 2Heraeus Deutschland GmbH & Co. KG, Hanau, Germany
Bulk metallic glasses combine extraordinary strength with a large elastic limit, making them interesting for industrial applications. However, the casting of parts is complicated by the high cooling rates that are necessary. Alternatively, the production and subsequent consolidation of amorphous powder can decouple the production of an amorphous pre-material from the forming of the final part.
Here, amorphous powder of the commercially available Zr-based glass-forming alloy AMZ4 (Zr59.3Cu28.8Al10.4Nb1.5) is consolidated by thermoplastic forming (TPF), where the glassy powder is processed in the supercooled liquid state. Various time and temperature protocols are tested and evaluated regarding the powder compaction and the conservation of the amorphous structure. Compact and amorphous samples are obtained and are subsequently tested by three-point beam bending. The results show that the consolidated samples are still outperformed by as-cast bulk material in bending, however reach the hardness of bulk material. The experimental observations in combination with isothermal crystallization times and viscosity measurements allow to determine a generic TPF processing window that can be used as a tool to assess the thermoplastic formability of different alloys.