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In-situ measurement of thermodiffusion in liquid alloys

Sondermann, Elke and Kargl, Florian and Meyer, Andreas (2021) In-situ measurement of thermodiffusion in liquid alloys. 14th International Meeting on Thermodiffusion, 25.-27. Mai 2021, Trondheim, Norwegen.

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Abstract

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.

Item URL in elib:https://elib.dlr.de/186542/
Document Type:Conference or Workshop Item (Speech)
Title:In-situ measurement of thermodiffusion in liquid alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sondermann, Elkeelke.sondermann (at) dlr.dehttps://orcid.org/0000-0001-5935-8945
Kargl, FlorianFlorian.Kargl (at) dlr.deUNSPECIFIED
Meyer, AndreasAndreas.Meyer (at) dlr.deUNSPECIFIED
Date:2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermodiffusion, metallische Schmelzen, flüssige Legierung, Temperaturunterschied, Röntgenradiographie
Event Title:14th International Meeting on Thermodiffusion
Event Location:Trondheim, Norwegen
Event Type:international Conference
Event Dates:25.-27. Mai 2021
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
Deposited By: Sondermann, Elke
Deposited On:13 Jun 2022 10:34
Last Modified:13 Jun 2022 10:34

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