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Einfluss von Kreuzkorrelationen auf die Interdiffusion in aluminiumreichen Al-Ni-Schmelzen

Sondermann, Elke (2015) Einfluss von Kreuzkorrelationen auf die Interdiffusion in aluminiumreichen Al-Ni-Schmelzen. Dissertation, Ruhr-Universität Bochum.

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Abstract

To study the relation of self- and interdiffusion at low concentrations experimentally, interdiffusion in aluminum-rich Al-Ni melts are determined as a function of temperature and concentration. In order to prevent measurements to be disturbed by convection, a setup was used which combines the shear-cell method with X-ray radiography. This allows for time-resolved in-situ measurements with improved process control. Possible concentration-shifts during melting or solidification are avoided. Buoyancy-driven convection was excluded by experiments aboard the sounding rocket MAPHEUS-4. Cross correlations slow down interdiffusion considerably, as can be seen in combination with self-diffusion coefficients and the thermodynamic factor. This is the case even at concentrations as low as 2 at.\% Ni. Consequently Darken's equation is not valid in this case.

Item URL in elib:https://elib.dlr.de/102503/
Document Type:Thesis (Dissertation)
Title:Einfluss von Kreuzkorrelationen auf die Interdiffusion in aluminiumreichen Al-Ni-Schmelzen
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sondermann, Elkeelke.sondermann (at) dlr.deUNSPECIFIED
Date:2015
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Diffusion, Metall, Legierung, Schmelze, Aluminium, Röntgenradiographie, Interdiffusion, Kreuzkorrelation
Institution:Ruhr-Universität Bochum
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 - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Sondermann, Elke
Deposited On:26 Jan 2016 11:30
Last Modified:31 Jul 2019 19:59

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