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Thermodiffusion in liquid alloys measured by X-ray radiography

Krüger, Asbjorn Torsvik and Sondermann, Elke and Meyer, Andreas (2022) Thermodiffusion in liquid alloys measured by X-ray radiography. 13th International Workshop on Subsecond Thermophysics, 2022-06-08 - 2022-06-10, Karlsruhe, Germany.

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Thermodiffusion (or Soret effect) describes the formation of a concentration gradient induced by a temperature gradient in binary or multicomponent mixtures. This cross-coupling effect of heat and mass transfer influences the homogeneity of doped semiconductors and grown crystals as well as the microstructure formation in alloys. The calculation of thermodiffusion by molecular dynamic simulation can be very sensitive to the specific potential. Recently improved theories were proposed but the database to validate models for thermodiffusion in liquid alloys is scarce. For several organic mixtures the Soret coefficients have been measured with high accuracy. However, for liquid alloys only very few Soret coefficients are known due to experimental challenges at the required high temperatures. We use X-radiography in combination with a high temperature furnace for space- and time-resolved measurements of the concentration distribution in the sample. This offers increased process control and makes the simultaneous measurement of interdiffusion possible. We present measurements of the Soret coefficient in aluminium-rich Al-Ag alloys at different concentrations. This alloy was chosen because of the high contrast between the two components in the X-ray spectrum used and because interdiffusion coefficients are known from independent measurements. The obtained interdiffusion coefficient are compared to literature values on the same system which corroborates the measured Soret coefficients. Silver is observed to migrate to the cold side.

Item URL in elib:https://elib.dlr.de/192417/
Document Type:Conference or Workshop Item (Speech)
Title:Thermodiffusion in liquid alloys measured by 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:9 June 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Thermodiffusion, Thermophoresis, Diffusion, Liquid metals, Transition metal alloys, Transport phenomena, X-ray imaging
Event Title:13th International Workshop on Subsecond Thermophysics
Event Location:Karlsruhe, Germany
Event Type:international Conference
Event Start Date:8 June 2022
Event End Date:10 June 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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