Reference : Ultrafast scanning calorimetry of newly developed Au-Ga bulk metallic glasses
 Document type : Scientific journals : Article Discipline(s) : Physical, chemical, mathematical & earth Sciences : Physics Focus Areas : Physics and Materials Science To cite this reference: http://hdl.handle.net/10993/43498
 Title : Ultrafast scanning calorimetry of newly developed Au-Ga bulk metallic glasses Language : English Author, co-author : Baller, Jörg* [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >] Neuber, Nico* [Saarland University - UdS] Frey, Maximilian [Saarland University - UdS] Cross, Oliver [Saarland University - UdS] Gallino, Isabella [Saarland University - UdS] Busch, Ralf [] * These authors have contributed equally to this work. Publication date : 2020 Journal title : Journal of Physics: Condensed Matter Publisher : Institute of Physics Publishing Volume : 32 Issue/season : 32 Special issue title : Special Issue on Liquid and Amorphous Metals Pages : 324001 Peer reviewed : Yes (verified by ORBilu) Audience : International ISSN : 0953-8984 e-ISSN : 1361-648X City : Bristol Country : United Kingdom Abstract : [en] The isothermal crystallization times and critical cooling rates of the liquid phase are determined for the two bulk metallic glass forming alloys Au49Ag5.5Pd2.3Cu26.9Si16.3 and Au51.6Ag5.8Pd2.4Cu20.2Ga6.7Si13.3 by using fast differential scanning calorimetry, covering the whole timescale of the crystallization event of the metallic melt. In the case of Au49Ag5.5Pd2.3Cu26.9Si16.3, a typical crystallization nose was observed, whereas for the Au51.6Ag5.8Pd2.4Cu20.2Ga6.7Si13.3, a more complex crystallization behavior with two distinct crystallization noses was found. Even for the complex crystallization behavior of the Au51.6Ag5.8Pd2.4Cu20.2Ga6.7Si13.3 alloy it is shown that the minimal isothermal nose time ${{\tau}}_{x}^{{\ast}}$ does allow for a quantification of the macroscopic critical thickness. It is discussed in contrast to the critical cooling rate, which is found to allow less exact calculations of the critical thickness and thus does not correlate well with the critical cooling rate from macroscopic experiments. Additionally the crystallization data of Au49Ag5.5Pd2.3Cu26.9Si16.3 was modeled using classical nucleation theory with the Johnson–Mehl–Avrami–Kolmogorov (JMAK) equation, enabling a determination of the interfacial energy. Target : Researchers ; Professionals Permalink : http://hdl.handle.net/10993/43498 DOI : 10.1088/1361-648X/ab8252 Other URL : https://iopscience.iop.org/article/10.1088/1361-648X/ab8252#artAbst

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