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In-situ measurement of thermodiffusion in liquid alloys

Sondermann, Elke and Kargl, Florian and Meyer, Andreas (2022) In-situ measurement of thermodiffusion in liquid alloys. 18th International Conference on Diffusion in Solids and Liquids (DSL2022), 27. Jun. - 01. Jul. 2022, Florenz, Italien.

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The Thermodiffusion (or Soret effect) describes the formation of a concentration gradient induced by a temperature gradient in binary or multicomponent mixtures. This crosscoupling 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 [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 analyze the 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 aluminum-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. [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, 3054 (2016). [2] E. Sondermann, F. Kargl, and A. Meyer, Phys. Rev. Lett., 123, 255902 (2019).

Item URL in elib:https://elib.dlr.de/187994/
Document Type:Conference or Workshop Item (Speech)
Title:In-situ measurement of thermodiffusion in liquid alloys
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sondermann, ElkeUNSPECIFIEDhttps://orcid.org/0000-0001-5935-8945UNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Thermodiffusion; Metallschmelze; Legierung; Röntgenradiographie
Event Title:18th International Conference on Diffusion in Solids and Liquids (DSL2022)
Event Location:Florenz, Italien
Event Type:international Conference
Event Dates:27. Jun. - 01. Jul. 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: Sondermann, Elke
Deposited On:19 Sep 2022 10:13
Last Modified:19 Sep 2022 10:13

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