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doi:10.22028/D291-39679
Titel: | The kinetic fragility of Pt-P- and Ni-P-based bulk glass-forming liquids and its thermodynamic and structural signature |
VerfasserIn: | Gross, Oliver Bochtler, Benedikt Stolpe, Moritz Hechler, Simon Hembree, William Busch, Ralf Gallino, Isabella |
Sprache: | Englisch |
Titel: | Acta Materialia |
Bandnummer: | 132 |
Seiten: | 118-127 |
Verlag/Plattform: | Elsevier |
Erscheinungsjahr: | 2017 |
Freie Schlagwörter: | Bulk metallic glass Fragility Medium-range order Viscosity Relaxation |
DDC-Sachgruppe: | 500 Naturwissenschaften |
Dokumenttyp: | Journalartikel / Zeitschriftenartikel |
Abstract: | The thermodynamic and kinetic properties of Pt-P- and Ni-P-based bulk glass-forming liquids are investigated using differential scanning calorimetry and three-point beam bending. The kinetic fragility of the alloys is determined by measuring relaxation times and equilibrium viscosities. In the Pt-P-based alloy family a Pt-rich alloy is one of the most fragile bulk glass-forming liquids in the vicinity of the glass transition reported so far. The fragility parameter D∗ increases significantly with decreasing Pt-content, which is due to a more pronounced loss of excess entropy upon undercooling for the fragile liquids. Relying on previous observations made for Pd-P-based alloys, it is argued that a bifurcation of the P environment into Pt-Ni-P and Pt-Cu-P structural units stabilizes the deeply undercooled liquid due to formation of medium range order (MRO). This is supported by synchrotron X-ray scattering experiments, which reveal the formation of a pre-peak in the total structure factor with increasing fragility. Adapting a previously reported empirical correlation, we show that the more fragile liquid alloys are characterized by a more pronounced dilatation of atomic pair correlations on the length scale of 1 nm, corroborating the idea that the observed fragility behavior of Pt-P-based bulk glass-forming liquids is inherently related to structural changes on the length scale of MRO. |
DOI der Erstveröffentlichung: | 10.1016/j.actamat.2017.04.030 |
URL der Erstveröffentlichung: | https://www.sciencedirect.com/science/article/abs/pii/S1359645417303233 |
Link zu diesem Datensatz: | urn:nbn:de:bsz:291--ds-396796 hdl:20.500.11880/35759 http://dx.doi.org/10.22028/D291-39679 |
ISSN: | 1359-6454 |
Datum des Eintrags: | 5-Mai-2023 |
Fakultät: | NT - Naturwissenschaftlich- Technische Fakultät |
Fachrichtung: | NT - Materialwissenschaft und Werkstofftechnik |
Professur: | NT - Prof. Dr. Ralf Busch |
Sammlung: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
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