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Thermodiffusion in liquid alloys measured by X-ray radiography

Krüger, Asbjorn Torsvik und Sondermann, Elke und 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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Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/192417/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Thermodiffusion in liquid alloys measured by X-ray radiography
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Krüger, Asbjorn TorsvikAsbjorn.Krueger (at) dlr.dehttps://orcid.org/0000-0002-3296-0431NICHT SPEZIFIZIERT
Sondermann, Elkeelke.sondermann (at) dlr.dehttps://orcid.org/0000-0001-5935-8945NICHT SPEZIFIZIERT
Meyer, AndreasAndreas.Meyer (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:9 Juni 2022
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Thermodiffusion, Thermophoresis, Diffusion, Liquid metals, Transition metal alloys, Transport phenomena, X-ray imaging
Veranstaltungstitel:13th International Workshop on Subsecond Thermophysics
Veranstaltungsort:Karlsruhe, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:8 Juni 2022
Veranstaltungsende:10 Juni 2022
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Forschung unter Weltraumbedingungen
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):R - Materialforschung und Mikrogravitation (MuM)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Materialphysik im Weltraum > Wissenschaftliche Experimente
Hinterlegt von: Krüger, Asbjorn Torsvik
Hinterlegt am:19 Dez 2022 07:36
Letzte Änderung:24 Apr 2024 20:53

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