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Concentration dependence of interdiffusion in aluminum-rich Al-Cu melts

Sondermann, Elke and Jakse, N. and Binder, K. and Mielke, A. and Heuskin, David and Kargl, Florian and Meyer, Andreas (2019) Concentration dependence of interdiffusion in aluminum-rich Al-Cu melts. Physical Review B, 99 (2), 024204. American Physical Society. doi: 10.1103/PhysRevB.99.024204. ISSN 1098-0121.

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Official URL: https://link.aps.org/doi/10.1103/PhysRevB.99.024204


We present measurements and ab initio molecular dynamic simulations of interdiffusion in aluminum-rich Al-Cu melts for concentrations up to 30 at. % copper. To obtain accurate data, a combination of x-ray radiography and shear-cell technique is used, including an experiment in microgravity. Interdiffusion coefficients between 5.3 and 3.2×10-9m2/s at 973 K are found experimentally with a slight decrease with increasing Cu concentration. Results from ab initio molecular dynamic simulation at 1000 K show a decrease of interdiffusion coefficients with the same slope at slightly higher values. Using Darken's equation to discuss the relation between self-diffusion and interdiffusion, we find the cross-correlation term S to be around unity by simulation and experiment.

Item URL in elib:https://elib.dlr.de/126345/
Document Type:Article
Title:Concentration dependence of interdiffusion in aluminum-rich Al-Cu melts
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sondermann, Elkeelke.sondermann (at) dlr.dehttps://orcid.org/0000-0001-5935-8945
Binder, K.karsten.binder (at) dlr.deUNSPECIFIED
Heuskin, DavidDavid.Heuskin (at) dlr.deUNSPECIFIED
Kargl, FlorianFlorian.Kargl (at) dlr.deUNSPECIFIED
Meyer, AndreasAndreas.Meyer (at) dlr.deUNSPECIFIED
Date:January 2019
Journal or Publication Title:Physical Review B
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1103/PhysRevB.99.024204
Page Range:024204
Publisher:American Physical Society
Keywords:Diffusion; liquid metal; x-ray Imaging; ab initio calculations
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:04 Feb 2019 07:27
Last Modified:06 Sep 2019 15:29

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