Influence of thermodynamic forces on diffusion in melts
- We report about diffusion measurements and molecular dynamic simulations
in Al-Ni and Al-Cu melts. Capillary methods were used to measure Ni and
Cu self diffusion and to measure interdiffusion. The combination of the
capillary set-up with X-ray radiography allowed in-situ detecting of
convective contributions to the interdiffusion transport by tracking the
time dependence of diffusion. Thus, the determination of the
interdiffusion coefficient can
be restricted to convection-free experiment times resulting in an
increased accuracy of the measured interdiffusion coefficient.
Additionally, quasielastic neutron scattering was used to measure
convection-free Ni and Cu self diffusion. Molecular dynamics simulations
were used to determine all diffusion coefficients and the thermodynamic
factor. The comparison between experiment and simulation shows an
excellent agreement of the interdiffusion coefficients as a function of
temperature. It was found thatWe report about diffusion measurements and molecular dynamic simulations
in Al-Ni and Al-Cu melts. Capillary methods were used to measure Ni and
Cu self diffusion and to measure interdiffusion. The combination of the
capillary set-up with X-ray radiography allowed in-situ detecting of
convective contributions to the interdiffusion transport by tracking the
time dependence of diffusion. Thus, the determination of the
interdiffusion coefficient can
be restricted to convection-free experiment times resulting in an
increased accuracy of the measured interdiffusion coefficient.
Additionally, quasielastic neutron scattering was used to measure
convection-free Ni and Cu self diffusion. Molecular dynamics simulations
were used to determine all diffusion coefficients and the thermodynamic
factor. The comparison between experiment and simulation shows an
excellent agreement of the interdiffusion coefficients as a function of
temperature. It was found that interdiffusion is enhanced by
thermodynamic forces with a maximum around the stoichiometric composition.…
MetadatenAutor*innen: | Axel GriescheORCiD |
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Koautor*innen: | J. Horbach, A. Meyer |
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Dokumenttyp: | Vortrag |
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Veröffentlichungsform: | Präsentation |
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Sprache: | Deutsch |
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Titel des übergeordneten Werkes (Deutsch): | TMS 2011 |
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Jahr der Erstveröffentlichung: | 2011 |
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Veranstaltung: | TMS 2011 |
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Veranstaltungsort: | San Diego, CA, USA |
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Beginndatum der Veranstaltung: | 2011-02-27 |
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Enddatum der Veranstaltung: | 2011-03-03 |
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Verfügbarkeit des Dokuments: | Weder Datei noch physisches Exemplar vorhanden ("No Access") |
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Datum der Freischaltung: | 19.02.2016 |
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Referierte Publikation: | Nein |
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Eingeladener Vortrag: | Nein |
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