Note: X-ray radiography for measuring chemical diffusion in metallic melts
- A x-ray radioscopy technique for measuring in situ chemical diffusion coefficients in metallic melts is presented. The long-capillary diffusion measurement method is combined with imaging techniques using microfocus tubes and flat panel detectors in order to visualize and quantitatively analyze diffusive mixing of two melts of different chemical composition. The interdiffusion coefficient as function of temperature and time is obtained by applying Ficks diffusion laws. Tracking the time dependence of the mean square penetration depth of the mixing process allows to detect changes in the mass transport caused by convective flow. The possibility to sort out convective mass transport contributions from analysis enhances significantly the accuracy compared to the conventional long-capillary diffusion measurement method with postmortem analysis. The performance of this novel diffusion measurement method with x-ray radiography technique is demonstrated by a diffusion experiment in an Al-NiA x-ray radioscopy technique for measuring in situ chemical diffusion coefficients in metallic melts is presented. The long-capillary diffusion measurement method is combined with imaging techniques using microfocus tubes and flat panel detectors in order to visualize and quantitatively analyze diffusive mixing of two melts of different chemical composition. The interdiffusion coefficient as function of temperature and time is obtained by applying Ficks diffusion laws. Tracking the time dependence of the mean square penetration depth of the mixing process allows to detect changes in the mass transport caused by convective flow. The possibility to sort out convective mass transport contributions from analysis enhances significantly the accuracy compared to the conventional long-capillary diffusion measurement method with postmortem analysis. The performance of this novel diffusion measurement method with x-ray radiography technique is demonstrated by a diffusion experiment in an Al-Ni melt.…
Autor*innen: | Axel GriescheORCiD, B. Zhang, E. Solórzano, F. Garcia-Moreno |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Review of scientific instruments |
Jahr der Erstveröffentlichung: | 2010 |
Verlag: | American Institute of Physics |
Verlagsort: | Melville, NY |
Jahrgang/Band: | 81 |
Erste Seite: | 056104-1 - 056104-3 |
Freie Schlagwörter: | Aluminium; Aluminium-alloys; Capillary; Chemical analysis; Chemical interdiffusion; Convection; Diffusion; In-situ; Liquid alloys; Mass transfer; Melt; Metal; Nickel; Nickel alloys; Radiography; X-ray apparatus |
DOI: | 10.1063/1.3427256 |
ISSN: | 0034-6748 |
ISSN: | 1089-7623 |
Verfügbarkeit des Dokuments: | Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access") |
Bibliotheksstandort: | Sonderstandort: Publica-Schrank |
Datum der Freischaltung: | 19.02.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 31.05.2010 |