Multiple Melting Temperatures in Glass-Forming Melts

Robert F. Tournier and Michael I. Ojovan
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Robert F. Tournier: UPR 3228 Centre National de la Recherche Scientifique, Laboratoire National des Champs Magnétiques Intenses, European Magnetic Field Laboratory, Institut National des Sciences Appliquées de Toulouse, Université Grenoble Alpes, F-31400 Toulouse, France
Michael I. Ojovan: Department of Materials, Imperial College London, London SW7 2AZ, UK

Sustainability, 2022, vol. 14, issue 4, 1-18

Abstract: All materials are vitrified by fast quenching even monoatomic substances. Second melting temperatures accompanied by weak exothermic or endothermic heat are often observed at T n+ after remelting them above the equilibrium thermodynamic melting transition at T m . These temperatures, T n+ , are due to the breaking of bonds (configurons formation) or antibonds depending on the thermal history, which is explained by using a nonclassical nucleation equation. Their multiple existence in monoatomic elements is now demonstrated by molecular dynamics simulations and still predicted. Proposed equations show that crystallization enthalpy is reduced at the temperature T x due to new vitrification of noncrystallized parts and their melting at T n+ . These glassy parts, being equal above T x to singular values or to their sum, are melted at various temperatures T n+ and attain 100% in Cu 46 Zr 46 Al 8 and 86.7% in bismuth. These first order transitions at T n+ are either reversible or irreversible, depending on the formation of super atoms, either solid or liquid.

Keywords: metallic glasses; melting temperatures; liquid–liquid transitions; chemical bonds; vitrification; crystallization; first order transitions (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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