Brillo, Jürgen and Arato, E. and Giuranno, D. and Kobatake, Hidekazu and Maran, Chiara and Rosello, Danilo and Novakovic, Rada and Ricci, Enrica (2018) Viscosity of liquid Ag-Cu alloys and the competition between kinetics and thermodynamics. High Temperatures-High Pressures, 47 (5), pp. 417-441. Old City Publishing. ISSN 0018-1544.
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Abstract
Viscosity of liquid Ag-Cu alloys is determined over the entire compositional range as function of temperature and composition by means of the oscillating cup technique. It is found that the viscosities of the pure elements can be related to their self-diffusion coeffcients via the StokesEinstein relation. The isothermal viscosities of the alloys investigated agree only reasonably with values predicted by models which are based mainly on thermodynamic principles. In particular, the viscosity isotherm exhibits a concave shape in the Cu-rich concentration range and a convex one in the Ag-rich range. Using a model based on the Stokes-Einstein relation, it can be shown that the behaviour mentioned above corresponds to a transition between two different mechanisms, i.e. a dynamic and a kinetic one. It is evident from the present study, in contrast to what is commonly practised, that the cross correlation term in the Darken equation has to be taken into account.
Item URL in elib: | https://elib.dlr.de/122672/ | ||||||||||||||||||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||||||||||||||||||
Title: | Viscosity of liquid Ag-Cu alloys and the competition between kinetics and thermodynamics | ||||||||||||||||||||||||||||||||||||
Authors: |
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Date: | 2018 | ||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | High Temperatures-High Pressures | ||||||||||||||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||||||||||||||||||||
Volume: | 47 | ||||||||||||||||||||||||||||||||||||
Page Range: | pp. 417-441 | ||||||||||||||||||||||||||||||||||||
Publisher: | Old City Publishing | ||||||||||||||||||||||||||||||||||||
ISSN: | 0018-1544 | ||||||||||||||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||||||||||||||
Keywords: | Ag-Cu liquid alloys viscosity self diffusion dynamics | ||||||||||||||||||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||||||||||||||||||||
HGF - Program: | Space | ||||||||||||||||||||||||||||||||||||
HGF - Program Themes: | Research under Space Conditions | ||||||||||||||||||||||||||||||||||||
DLR - Research area: | Raumfahrt | ||||||||||||||||||||||||||||||||||||
DLR - Program: | R FR - Research under Space Conditions | ||||||||||||||||||||||||||||||||||||
DLR - Research theme (Project): | R - Materials Research and Microgravity (MuM) | ||||||||||||||||||||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||||||||||||||||||||
Institutes and Institutions: | Institute of Materials Physics in Space > Scientific Experiments MP | ||||||||||||||||||||||||||||||||||||
Deposited By: | Brillo, Dr.rer.nat. Jürgen | ||||||||||||||||||||||||||||||||||||
Deposited On: | 05 Nov 2018 14:39 | ||||||||||||||||||||||||||||||||||||
Last Modified: | 06 Sep 2019 15:20 |
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