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MM: Fachverband Metall- und Materialphysik
MM 29: Poster II
MM 29.10: Poster
Dienstag, 19. März 2024, 17:00–19:00, Poster B
Thermodynamic and kinetic study of Pt42.5CuxNi36.5-xP21 alloy variations — •Ziyu Ling1, Maryam Chegeni1, Ralf Busch1, and Isabella Gallino2 — 1Chair of Metallic Materials, Saarland University, Germany — 2Department of Materials Science and Engineering, Metallic Materials, TU-Berlin, Germany
In this work, the thermodynamic and kinetic properties of Pt42.5CuxNi36.5-xP21 (x = 36.5, 27, 18.25, 9.5, 0) glass-forming liquids are studied via Perkin Elmer DSC and Flash DSC (Mettler Toledo). The kinetic fragilities of the alloys are determined by measuring relaxation times in a broad heating rates range using a Tg shift method (Busch, 2000). In addition, the relaxation time of the deeply undercooled liquids is determined by FDSC via a step-response method (Monnier et al., 2020). 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 difference between the liquid and crystalline states at the glass transition temperature and the driving force for crystallization is calculated using fitting parameters of thermodynamic functions. Moreover, the GFA of the alloy liquids is evaluated by determining their critical cooling rates and measuring their TTT-diagrams. The interfacial energy is obtained by JMAK fitting with TTT-diagrams. The aim of this work is to investigate the influence of Cu and Ni substitution on the thermophysical properties of the alloy and verify the argument that interfacial energy is the main contribution to the high GFA of Pt-P based alloys.