Sondermann, Elke und Kargl, Florian und Meyer, Andreas (2021) In-situ measurement of thermodiffusion in liquid alloys. 14th International Meeting on Thermodiffusion, 2021-05-25 - 2021-05-27, Trondheim, Norwegen.
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Kurzfassung
Thermodiffusion in liquid alloys influences the homogeneity of doped semiconductors and grown crystals as well as the microstructure formation in alloys. The calculation of thermodiffusion in alloys by molecular dynamic simulation can be sensitive to the specific interatomic potential [1]. Recently improved theories were proposed but the database to validate models for thermodiffusion in liquid alloys is scarce. Therefore, reliable measurements are needed. For transparent materials, in-situ methods are well established whereas for liquid alloys it was only possible to analyse solidified samples. We present a method using X-ray radiography in combination with a high temperature furnace to determine the concentration profile in a vertical capillary [2]. In alloys with sufficient contrast in X-ray absorption this technique allows for in-situ observation which excludes disturbances by solidification and reveals possible error sources as e.g. free surfaces. Furthermore, these measurements are time-resolved. Measuring the concentration distribution at different points in time allows us to verify that a steady state has been reached and makes a simultaneous measurement of thermodiffusion and diffusion possible. This is demonstrated with an aluminium-rich Al-Ni melt where nickel is found to migrate to the cold side. The derived interdiffusion coefficient is compatible with independent measurements of interdiffusion in liquid Al-Ni. References [1] E. V. Levchenko, A. V. Evteev, T. Ahmed, A. Kromik, R. Kozubski, I. V. Belova, Z.-K. Liu, and G. E. Murch, Philos. Mag., 96 (2016) 3054. [2] E. Sondermann, F. Kargl, and A. Meyer, Phys. Rev. Lett., 123 (2019) 255902.
elib-URL des Eintrags: | https://elib.dlr.de/186542/ | ||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||
Titel: | In-situ measurement of thermodiffusion in liquid alloys | ||||||||||||||||
Autoren: |
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Datum: | 2021 | ||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||
Open Access: | Nein | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | Thermodiffusion, metallische Schmelzen, flüssige Legierung, Temperaturunterschied, Röntgenradiographie | ||||||||||||||||
Veranstaltungstitel: | 14th International Meeting on Thermodiffusion | ||||||||||||||||
Veranstaltungsort: | Trondheim, Norwegen | ||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||
Veranstaltungsbeginn: | 25 Mai 2021 | ||||||||||||||||
Veranstaltungsende: | 27 Mai 2021 | ||||||||||||||||
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 | ||||||||||||||||
Hinterlegt von: | Sondermann, Elke | ||||||||||||||||
Hinterlegt am: | 13 Jun 2022 10:34 | ||||||||||||||||
Letzte Änderung: | 24 Apr 2024 20:47 |
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