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The Influence of Convection on Non-Equlibrium Solidification of Silver-Germanium alloys

Vojetech, D. and Holecek, S. and Bàrta, C. and Bàrta, C. jr. and Otto, G. and Görler, G. and Wittmann, K. and Röstel, R. (1997) The Influence of Convection on Non-Equlibrium Solidification of Silver-Germanium alloys. 9th Proceedings of the International Metallurgy and Materials Congress; Istanbul, Türkiye; 11.-15.06.1997.

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Abstract

The hypo- and hypereutectic alloys of typical anomalous silver-germanium eutectic system have been solidified under both terrestrial and space conditions with the goal to create distinct convective flow levels in system. A special arrangement during crystallization has been used to decrease the inluence of oxide particles in the melt on nucleation process. The convection has been found to affect strongly nucleation and growth processes of both primary crystals and eutectic. Significant differeces have been observed in morphology and in solute segregation in microstructural components. The obtained results show much greater departure of solidifying system from equilibrium in the case of limited mobility of components (limited convection). In this way, the space conditions provide valuable enviroment to understand processes between equilibrium solidification of alloys and their transition into glassy state.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=1999,
Title:The Influence of Convection on Non-Equlibrium Solidification of Silver-Germanium alloys
Authors:
AuthorsInstitution or Email of Authors
Vojetech, D.Institut of Chemical Technology, Dept. of Metals and Corrosion Engieneering, Prague, Czech Republic
Holecek, S.Institut of Chemical Technology, Dept. of Metals and Corrosion Engieneering, Prague, Czech Republic
Bàrta, C.BBT Materials Processing, Prague, Czech Republic
Bàrta, C. jr.BBT Materials Processing, Prague, Czech Republic
Otto, G.German Aerospace Research Establishment, Cologne, Germany
Görler, G.German Aerospace Research Establishment, Cologne, Germany
Wittmann, K.German Aerospace Research Establishment, Cologne, Germany
Röstel, R.German Aerospace Research Establishment, Cologne, Germany
Date:1997
Page Range:pp. 1525-1530
Status:Published
Keywords:Solidification, Eutectic solidification, Convection, Microgravity, Silver, Germanium
Event Title:9th Proceedings of the International Metallurgy and Materials Congress; Istanbul, Türkiye; 11.-15.06.1997
Organizer:Union of Chambers of Turkish Engineers and Architects
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > Hauptabteilung Raumflugbetrieb und Astronautenausbildung
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 17:09

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