Zeit: 16:30 - 18:00
Leibniz Institut für Werkstofforientierte Technologien (IWT) Badgasteiner Str. 3
Bulk metallic glasses combine unique properties which render them interesting for many applications. However, up to now their use has been largely limited by price, complexity and size of components that can be manufactured using conventional techniques. Recently, it has been demonstrated that bulk metallic glasses can be produced by additive manufacturing (AM). The layer-wise formation of parts helps to overcome limitations in size and geometry and extends the range of possible applications and markets, re-stimulating the interest in this class of materials both in the scientific community and in industry. However, the new processing routes also result in new challenges. In particular the uptake of light elements, such as oxygen and nitrogen, occurring along the entire AM process chain can be detrimental for quality of printed parts. In order to gain a better understanding on the influence of light elements on the performance of metallic glasses produced by laser beam melting, fully amorphous parts are printed from Zr-based bulk metallic glass powders with different degrees of contamination by light elements, and their thermal properties as well as mechanical properties are studied using differential scanning calorimetry as well as compression testing, beam bending, wear tracks, and hardness measurements. It is found that increased oxygen levels in powder and printed parts lead to lowered stability of amorphous against competing crystalline phases and cause a decrease in ductility with together with the remaining porosity leads to a decrease in the mechanical performance of printed components. Thus, obtaining high quality parts requires a precise control of the uptake of light elements along the entire AM process chain.
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Arbeitsgemeinschaft Wärmebehandlung und Werkstofftechnik
VDI Verein Deutscher Ingenieure