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Measurement of the Soret coefficient in liquid Al-Ag alloys using X-ray radiography

Krüger, Asbjorn Torsvik and Sondermann, Elke and Meyer, Andreas (2022) Measurement of the Soret coefficient in liquid Al-Ag alloys using X-ray radiography. 18th International Conference on Diffusion in Solids and Liquids, 2022-06-27 - 2022-07-01, Florence, Italy.

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Abstract

Thermodiffusion, also called Soret effect, is the separation of the components of a mixture toward the hot/cold regions in a nonuniform temperature distribution. The effect is observed to influence a wide range of systems, from ocean water over magma and crystal growth to stellar plasma. For several organic mixtures the Soret coefficients have been measured with high accuracy. However, for liquid alloys only very few Soret coefficients are known, the reasons being the experimental challenges at the required high temperatures, such as convection, and difficulties of direct analysis. We present our work on determining the Soret coefficient of liquid aluminium-silver in a concentration range of 20 to 55 at.% Ag, using X-ray radiography (XRR). Silver is observed to migrate to the cold side. Thanks to the in-situ measurements with XRR, the transient concentration separation can also be analysed, which makes determination of the inter-diffusion coefficient possible. This inter-diffusion coefficient is then compared to literature values on the same system, corroborating the measured Soret coefficient.

Item URL in elib:https://elib.dlr.de/192419/
Document Type:Conference or Workshop Item (Speech)
Title:Measurement of the Soret coefficient in liquid Al-Ag alloys using X-ray radiography
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Krüger, Asbjorn TorsvikUNSPECIFIEDhttps://orcid.org/0000-0002-3296-0431UNSPECIFIED
Sondermann, ElkeUNSPECIFIEDhttps://orcid.org/0000-0001-5935-8945UNSPECIFIED
Meyer, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:29 June 2022
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermodiffusion, Thermophoresis, Diffusion, Liquid metals, Transition metal alloys, Transport phenomena, X-ray imaging
Event Title:18th International Conference on Diffusion in Solids and Liquids
Event Location:Florence, Italy
Event Type:international Conference
Event Start Date:27 June 2022
Event End Date:1 July 2022
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: Krüger, Asbjorn Torsvik
Deposited On:19 Dec 2022 07:36
Last Modified:24 Apr 2024 20:53

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