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MM: Fachverband Metall- und Materialphysik
MM 26: Topical Session: Thermophysical Properties of Bulk Metallic Glasses and Bulk Metallic Glass-forming Liquids
MM 26.5: Talk
Thursday, March 20, 2025, 11:15–11:30, H10
Thermodynamic, kinetic and structural study of Pt42.5CuxNi36.5-xP21 alloy variations — •Ziyu Ling1, Maryam Rahimi Chegeni1, Nico Neuber1, Sergey Kasatikov2, Amirhossein Ghavimi1, Andrea Fantin3, Isabella Gallino4, and Ralf Busch1 — 1Lehrstuhl für Metallische Werkstoffe, Universität des Saarlandes — 2Helmholtz-Zentrum Berlin für Materialien und Energie Elektrochemische Energiespeicherung — 3Bundesanstalt für Materialforschung und -prüfung, Berlin — 4Lehrstuhl für Metallische Werkstoffe,TU Berlin
The thermodynamic and kinetic properties of Pt42.5CuxNi36.5-xP21 glass-forming liquids are studied via differential scanning calorimetry and Flash DSC (Mettler Toledo). The kinetic fragilities of the alloys are determined from relaxation times measured in a broad heating rates range using a Tg shift method and the relaxation time of the deeply undercooled liquids determined via a step-response method. Furthermore, the specific capacity heat (Cp) as a function of temperature for the glassy, liquid and crystalline state of the chosen alloys are determined. The thermodynamic fragility is assessed from the ’Cp jump’ at Tg and the driving force for crystallization is calculated using fitting parameters of thermodynamic functions derived from Cp data. Then the glass forming ability of the alloy liquids is evaluated based on their critical cooling rates and TTT-diagrams. The interfacial energy is obtained by JMAK fitting with TTT-diagrams. Moreover, the alloy ribbons were investigated by synchrotron X-ray scattering experiments at DESY for structural study and by XPS and NEXAFS at BESSY for energy state information of each elements.
Keywords: Bulk metallic glass; Thermodynamics; Fragility; Synchrotron X-ray diffraction; X-ray Photoelectron Spectroscopy