Article (Scientific journals)
Ultrafast scanning calorimetry of newly developed Au-Ga bulk metallic glasses
Neuber, Nico; Frey, Maximilian; Gross, Oliver et al.
2020In Journal of Physics: Condensed Matter, 32 (32), p. 324001
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Keywords :
amorphous metal; crystallization; fast scanning calorimetry; interfacial energy; noble metal
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 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.
Disciplines :
Physics
Author, co-author :
Neuber, Nico;  Saarland University > Chair of Metallic Materials
Frey, Maximilian;  Saarland University > Chair of Metallic Materials
Gross, Oliver;  Saarland University > Chair of Metallic Materials ; Amorphous Metal Solutions GmbH, Homburg, Germany
Baller, Jörg ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Gallino, Isabella;  Saarland University > Chair of Metallic Materials
Busch, Ralf;  Saarland University > Chair of Metallic Materials
External co-authors :
yes
Language :
English
Title :
Ultrafast scanning calorimetry of newly developed Au-Ga bulk metallic glasses
Publication date :
29 July 2020
Journal title :
Journal of Physics: Condensed Matter
ISSN :
1361-648X
Publisher :
IOP Publishing, Bristol, United Kingdom
Special issue title :
Special Issue on Liquid and Amorphous Metals
Volume :
32
Issue :
32
Pages :
324001
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
Available on ORBilu :
since 14 June 2020

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