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Influence of Cross-Correlations on Interdiffusion in Liquid Alloys

Sondermann, Elke and Jakse, Noel and Binder, Karsten and Mielke, Annette and Heuskin, David and Kargl, Florian and Meyer, Andreas (2019) Influence of Cross-Correlations on Interdiffusion in Liquid Alloys. 15th International Conference on Diffusion in Solids and Liquids (DSL2019), Athen, Griechenland.

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Abstract

Diffusion in the melt impacts on the formation and evolution of microstructure during solidification. Al-Cu has been established as a model system on which numerous studies were performed regarding the solidification behaviour, its thermophysical properties and the structure of the melt. Furthermore, Al-Cu exhibits pronounced X-ray contrast, facilitating the application of in situ measurement techniques. We present accurate measurements of interdiffusion in Al-Cu melts. Data are obtained by a combination of X-ray radiography with a linear shear-cell on ground and under microgravity conditions. This method avoids disturbances due to the melting process, free surfaces or buoyancy-driven convection. Additional interdiffusion experiments in a classical shear-cell further verify the reliability of the measurement results. In a binary alloy, self- and interdiffusion coefficients are connected by the thermodynamic factor, the concentrations and a factor which describes the influence of cross-correlations. We used self-diffusion coefficients from quasi-elastic neutron scattering to determine this cross-correlation factor. It is shown that its influence is weak in Al-rich Al-Cu melts. The results are in good agreement to ab inito molecular dynamic simulations.

Item URL in elib:https://elib.dlr.de/132998/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of Cross-Correlations on Interdiffusion in Liquid Alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sondermann, Elkeelke.sondermann (at) dlr.dehttps://orcid.org/0000-0001-5935-8945
Jakse, NoelUNSPECIFIEDUNSPECIFIED
Binder, KarstenUNSPECIFIEDUNSPECIFIED
Mielke, AnnetteUNSPECIFIEDUNSPECIFIED
Heuskin, DavidDavid.Heuskin (at) dlr.deUNSPECIFIED
Kargl, FlorianFlorian.Kargl (at) dlr.deUNSPECIFIED
Meyer, AndreasAndreas.Meyer (at) dlr.deUNSPECIFIED
Date:June 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Diffusion; flüssige Metalle; Legierung; Röntgenradiographie; Simulation
Event Title:15th International Conference on Diffusion in Solids and Liquids (DSL2019)
Event Location:Athen, Griechenland
Event Type:international Conference
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:30 Dec 2019 14:48
Last Modified:30 Dec 2019 14:48

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