Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 41: Liquid and Amorphous Metals

MM 41.1: Vortrag

Mittwoch, 14. März 2018, 15:15–15:30, TC 010

Development and Characterization of Sulfur-bearing Bulk Metallic Glasses — •Alexander Kuball, Oliver Gross, Benedikt Bochtler, and Ralf Busch — Saarland University, Saarbrücken, Germany

Bulk metallic glass formation can be observed in many metallic systems by rapid cooling from the equilibrium liquid. However, the best metallic glass formers known so far can be found in systems with high concentrations of expensive and/or toxic elements like zirconium, phosphorous, or beryllium, limiting their commercialization.

Recently, we reported on a completely novel family of sulfur-bearing bulk metallic glasses (BMGs) excluding toxic elements. Bulk glass formation is observed in several multicomponent systems like in Pd-, Zr-, Cu-, Ni- and Ti-based alloys. Among these systems, especially the novel Ti-based alloys are of great interest for many fields of application. They show casting thicknesses for the synthesis of fully amorphous samples of up to 1 mm in combination with record Ti-contents of up to 70 at%, yielding to enormously high specific strength values.

The process of glass formation in these novel systems is discussed in terms of kinetics and thermodynamics. Because of the compositional differences in comparison to the BMG forming liquids known so far, the thermophysical characterization of sulfur-bearing BMGs may lead to an extended understanding of the glass forming ability in metallic systems in general.