Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 69: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses VII - thermodynamics and structure

MM 69.5: Vortrag

Donnerstag, 23. März 2017, 18:30–18:45, IFW A

Thermodynamic and dynamic studies of phosphorus containing bulk glass forming liquids — •Oliver Gross, Benedikt Bochtler, Moritz Stolpe, Simon Hechler, William Hembree, Ralf Busch, and Isabella Gallino — Saarland University, Chair of Metallic Materials, Campus C6.3 66123 Saarbruecken, Germany

Phosphorous containing bulk metallic glass forming alloys (BMGs) are among the best metallic glass formers known to date. The newly developed Ni-P-based BMGs are no exception (critical casting thickness *1 cm) and provide an attractive alternative to Zr-based BMGs for industrial applications due to their relatively inexpensive constituents, good processability and exceptional corrosion resistance. Pt-P-based BMGs feature a large supercooled liquid region and an attractive color, which makes them highly promising for jewelry applications.

In this comparative study, the thermophysical properties of different phosphorus containing alloys (Ni-P, Pt-P) are investigated using differential-scanning calorimetry and thermal mechanical analysis for the determination of the specific heat capacity and equilibrium viscosity, respectively. The specific heat capacity data was used to calculate the enthalpy and entropy difference between the liquid and the crystalline mixture. Interestingly, the alloys differ considerably in their thermodynamic properties, whereas they show a similar behavior in the temperature dependence of their equilibrium viscosity.