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MICROSTRUCTURE EVOLUTION IN RAPIDLY SOLIDIFIED IMMISCIBLE Al-BASED-ALLOYS

Schmidt-Hohagen, Frank and Ratke, Lorenz and 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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Abstract

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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:MICROSTRUCTURE EVOLUTION IN RAPIDLY SOLIDIFIED IMMISCIBLE Al-BASED-ALLOYS
Authors:
AuthorsInstitution or Email of Authors
Schmidt-Hohagen, FrankUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Zhao, JiuzhouInstitute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Date:October 2006
Journal or Publication Title:3rd Germany-China Workshop on Microgravity and Space Life Sciences ( Programme and Abstracts )
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:hypermonotectic alloy, miscibility gap, liquid-liquid decomposition, monotectic reaction, nucleation process, microstructure evolution
Event Title:3rd Germany-China Workshop on Microgravity and Space Life Sciences
Event Location:Berlin ( Germany )
Event Type:international Conference
Event Dates:2006-10-08 - 2006-10-11
Organizer: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 - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Institute of Space Simulation > Center for Solidification of Undercooled Melts (ZEUS)
Deposited By: Frank Schmidt-Hohagen
Deposited On:26 Oct 2006
Last Modified:27 Apr 2009 13:11

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