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Self and Chemical Diffusion in Liquid Al-Ag

Engelhardt, M and Meyer, Andreas and Yang, Fan and Simeoni, G. and Kargl, F (2016) Self and Chemical Diffusion in Liquid Al-Ag. Defect and Diffusion Forum, 367, pp. 157-166. Trans Tech Publications. doi: 10.4028/www.scientific.net/DDF.367.157. ISSN 1012-0386.

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Official URL: http://www.scientific.net/DDF.367.157

Abstract

Self-and chemical diffusion coefficients are reported for molten Al-Ag on the Al-rich side of the phase diagram for Ag concentrations of up to 45at% and for pure liquid Ag. Temperature dependent Ag self-diffusion coefficients were obtained using quasi-elastic neutron scattering. Chemical diffusion coefficients were measured in situ by means of X-ray radiography of a long-capillary furnace. A detailed error analysis for the long-capillary experiments is reported. It is shown that perturbing effects can be detected and that accurate chemical diffusion coefficients can be measured with high precision. It is demonstrated based on Al-Ag20at% that the Darken equation appears to be valid for this system with a thermodynamic factor lower than unity. Furthermore, in Al-Ag it appears that Ag self-diffusion for small Ag concentrations is faster than Al-self-diffusion in liquid Al. This contrasts with observations made for other Al-based melts like Al-Ni and Al-Cu.

Item URL in elib:https://elib.dlr.de/106964/
Document Type:Article
Title:Self and Chemical Diffusion in Liquid Al-Ag
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Engelhardt, MInstitut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, GermanyUNSPECIFIED
Meyer, Andreasandreas.meyer (at) dlr.deUNSPECIFIED
Yang, Fanfan.yang (at) dlr.deUNSPECIFIED
Simeoni, G.FRM-2, Garching, GermanyUNSPECIFIED
Kargl, FInstitut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, GermanyUNSPECIFIED
Date:April 2016
Journal or Publication Title:Defect and Diffusion Forum
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:367
DOI :10.4028/www.scientific.net/DDF.367.157
Page Range:pp. 157-166
Publisher:Trans Tech Publications
ISSN:1012-0386
Status:Published
Keywords:self diffusion, chemical diffusion, X-ray radiography, quasi-elastic neutron scattering, Darken relation, liquid metal alloys
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 - Material Design and New Materials, R - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Kargl, Dr Florian
Deposited On:24 Oct 2016 07:49
Last Modified:06 Sep 2019 15:22

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