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MICROSTRUCTURE EVOLUTION IN RAPIDLY SOLIDIFIED IMMISCIBLE Al-BASED-ALLOYS

Schmidt-Hohagen, Frank und Ratke, Lorenz und Zhao, Jiuzhou (2006) MICROSTRUCTURE EVOLUTION IN RAPIDLY SOLIDIFIED IMMISCIBLE Al-BASED-ALLOYS. In: 3rd Germany-China Workshop on Microgravity and Space Life Sciences ( Programme and Abstracts ). 3rd Germany-China Workshop on Microgravity and Space Life Sciences, 2006-10-08 - 2006-10-11, Berlin ( Germany ).

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Kurzfassung

When a hypermonotectic alloy is cooled from the single-phase liquid state into the miscibility gap the components are no longer miscible and two liquid phases develop. Generally the liquid-liquid decomposition of an initially homogenous liquid begins with the nucleation of the liquid minority phase in the form of droplets, which grow by diffusion in a supersaturated matrix and collision and coagulation of drops induced by Stokes and /or Marangoni motion. Reaching the non-variant monotectic reaction temperature the matrix liquid decomposes into a solid and a second phase, being not distinguishable from the liquid minority phase that emerged in the miscibility gap. The size spectra of the drops of both processes merge the larger the cooling rate. Within a suitable interval of cooling rates they become, however, distinguishable and then the spectra stemming from the liquid-liquid decomposition gives unique access to the nucleation process inside the miscibility gap. The main target of the present investigations is to achieve a physical understanding of the liquid-liquid phase separation by studying the microstructure evolution in different alloys, cooled with various cooling rates through the miscibility gap and comparing the experimental results with modelled microstructures.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:MICROSTRUCTURE EVOLUTION IN RAPIDLY SOLIDIFIED IMMISCIBLE Al-BASED-ALLOYS
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Schmidt-Hohagen, FrankNICHT SPEZIFIZIERT
Ratke, LorenzNICHT SPEZIFIZIERT
Zhao, JiuzhouInstitute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Datum:Oktober 2006
Erschienen in:3rd Germany-China Workshop on Microgravity and Space Life Sciences ( Programme and Abstracts )
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:hypermonotectic alloy, miscibility gap, liquid-liquid decomposition, monotectic reaction, nucleation process, microstructure evolution
Veranstaltungstitel:3rd Germany-China Workshop on Microgravity and Space Life Sciences
Veranstaltungsort:Berlin ( Germany )
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2006-10-08 - 2006-10-11
Veranstalter :German Aerospace Center (DLR), Chinese Academy of Sciences (CAS), Chinese National Space Administration (CNSA), National Microgravity Laboratory/CAS (NML/CAS), Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W FR - Forschung unter Weltraumbedingungen (alt)
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Materialforschung unter Mikro-g (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Materialphysik im Weltraum > Institut für Raumsimulation > Zentrum für die Erstarrung unterkühlter Schmelzen (ZEUS)
Hinterlegt von: Frank Schmidt-Hohagen
Hinterlegt am:26 Okt 2006
Letzte Änderung:27 Apr 2009 13:11

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