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MM: Fachverband Metall- und Materialphysik

MM 8: Liquid and Amorphous Metals II: Structure Formation in Metallic Glasses

MM 8.4: Talk

Monday, March 16, 2015, 12:30–12:45, H 0107

Effects of hydrogen-microalloying on the properties of bulk metallic glasses — •Davide Granata, Erwin Fischer, and Jörg F. Löffler — Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, Switzerland.

Microalloying, i.e. the addition of small amounts of alloying elements, has been found to be a viable tool to significantly improve the glass-forming ability (GFA) of metallic systems. In this work we identified hydrogen to be an ideal microalloying element to simultaneously improve the GFA and mechanical properties of bulk metallic glasses (BMGs). We processed various BMGs under a hydrogen-containing atmosphere and thus directly introduced hydrogen as an alloying partner to the resulting glass structure. Using this hydrogen-microalloying approach we found a simultaneous enhancement of the attainable critical casting thickness and malleability. The effectiveness of this processing route depends on how strongly hydrogen is incorporated into the microstructure and thus how strongly hydrogen (out-)diffusion can be suppressed. Based on these results, we will also discuss implications for future BMG design.