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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 (2023) Measurement of the Soret coefficient in liquid Al-Ag alloys using X-ray radiography. Physical Review B, 107 (6), 064301-1. American Physical Society. doi: 10.1103/PhysRevB.107.064301. ISSN 2469-9950.

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Official URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.107.064301


Thermodiffusion designates a diffusive motion of particles driven by a temperature gradient. In liquid alloys, this effect can influence the concentration distribution during directional solidification and change the homogeneity of grown crystals. Using x-ray radiography (XRR), thermodiffusion in liquid Al-Ag has been measured, with compositions ranging from Al80Ag20 to Al50Ag50. The Soret coefficient is determined to be (0.9±0.3)×10e-3 /K, where the silver atoms diffuse to the cold end of the sample. Thanks to the time-resolved information from in situ XRR, the interdiffusion coefficient could simultaneously be measured and is in good agreement with previous interdiffusion measurements in this concentration range. The measured Soret coefficient is compared with the values predicted by the current theoretical models, which are found to be off by at least a factor of two.

Item URL in elib:https://elib.dlr.de/192413/
Document Type:Article
Title:Measurement of the Soret coefficient in liquid Al-Ag alloys using X-ray radiography
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
Date:15 February 2023
Journal or Publication Title:Physical Review B
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:064301-1
Publisher:American Physical Society
Keywords:Thermophoresis, Diffusion, Liquid metals, Transition metal alloys, Transport phenomena, X-ray imaging
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:17 Feb 2023 09:27
Last Modified:17 Feb 2023 09:27

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