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Solidification of alloys with a liquid miscibility gap

Ratke, Lorenz (2011) Solidification of alloys with a liquid miscibility gap. In: Solidification Science and Technology, pp. 165-180. Brunel University Press. John Hunt International Symposium, 12.Dez. - 14. Dez. 2011, London, UK. ISBN 978-1-902316-99-4.

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Abstract

The solidification of alloys with a liquid miscibility gap, called monotectic alloys, is puzzling since decades especially compared to eutectic solidification to which they seem very similar. Alloys with exact monotectic composition solidify at the monotectic temperature by decomposition into a solid and a liquid phase and thus differ from eutectic ones only by the occurrence of a liquid phase at the nonvariant point. Alloys with hypermonotectic composition have to pass the liquid miscibility gap and thus a large region ahead of the monotectic reaction front is thermodynamically in a two-phase liquid state. Four different microstructures are observed in solidification of such alloys: fibrous arrangement of the liquid phase, string of pearls, irregularly dispersed droplet and fully segregated two layer arrangement. The paper reviews the monotectic solidification and the occurrence of fibres and string-of-pearls in light of new experimental results and describes the importance of nucleation in the case of hypermonotectic alloys when inoculants trigger the two-phase liquid microstructure.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Solidification of alloys with a liquid miscibility gap
Authors:
AuthorsInstitution or Email of Authors
Ratke, LorenzUNSPECIFIED
Date:11 December 2011
Journal or Publication Title:Solidification Science and Technology
Page Range:pp. 165-180
Editors:
EditorsEmail
Fan, Z.Brunel University
Stone, I.C.Brunel University
Publisher:Brunel University Press
ISBN:978-1-902316-99-4
Status:Published
Keywords:Monotectic alloys, miscibility gap, fibrous growth, coupled growth, nucleation
Event Title:John Hunt International Symposium
Event Location:London, UK
Event Type:international Conference
Event Dates:12.Dez. - 14. Dez. 2011
Organizer:Brunel University
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prof. Lorenz Ratke
Deposited On:20 Dec 2011 10:00
Last Modified:20 Dec 2011 10:00

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