Bitte benutzen Sie diese Referenz, um auf diese Ressource zu verweisen: doi:10.22028/D291-39679
Volltext verfügbar? / Dokumentlieferung
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

Dateien zu diesem Datensatz:
Es gibt keine Dateien zu dieser Ressource.


Alle Ressourcen in diesem Repository sind urheberrechtlich geschützt.