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MM: Fachverband Metall- und Materialphysik
MM 64: Liquid and Amorphous Materials IV
MM 64.1: Vortrag
Donnerstag, 21. März 2024, 16:45–17:00, C 243
Thermodynamic Assessment and CALPHAD Simulation of the Ni-Pd-S Glass Forming Ternary System — •Maryam Rahimi Chegeni1, Wenhao Ma2, Sascha Riegler1, Amirhossein Ghavimi1, Magnus Rohde2, Hans Jürgen Seifert2, Isabella Gallino3, and Ralf Busch1 — 1Saarland University, Chair of Metallic Materials, Germany — 2Karlsruhe Institute of Technology, Institute for Applied Materials-Applied Materials Physics, Germany — 3Department of Materials Science and Engineering, Metallic Materials, TU-Berlin, Ernst-Reuter-Platz 1, 10587 Berlin, Germany
This work conducts an experimental and computational investigation into the thermo-physical properties of the novel ternary BMG-forming Ni-Pd-S system. The simplicity of the ternary Ni-Pd-S BMG-forming system facilitates the application of the CALPHAD approach for the modeling of the underlying thermodynamics affecting the glass formation.
Experimental quantitative specific heat capacity and crystallization studies of glass-forming compositions are performed to assess thermodynamic parameters and generate input data for the calculations and modeling of the undercooled liquid. Using the two-state approach , the modeling of the undercooled liquid and glass for the pure elements and the corresponding ternary system is done.
Subsequently, the evaluation of the glass forming ability of the system is performed using the parallel tangent method for Gm of the crystalline and the liquid phases and the results are used for modeling the isothermal TTT diagrams.
Keywords: Pd-Ni-S bulk glass forming system; Calphad Calculation; Driving force for crystallisation; Interfacial Energy; TTT Diagram