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Monotectic growth morphologies and their transitions

Ratke, Lorenz and Müller, Anja and Seifert, Martin and Kasperovich, Galina (2008) Monotectic growth morphologies and their transitions. In: Phase transformations in Multicomponent Melts Wiley-VCH. pp. 39-54.

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Official URL: http://www.wiley-vch.de/dt/books


Alloys of exact monotectic composition can decompose at the monotectic temperature into three different two phase microstructures. The minority phase can be arranged as fibers similar to eutectics, as string of pearls or as irregularly distributed droplets. The solidification of three Al-base monotectic alloys was investigated, Al-Pb, Al-In and Al-Bi. The solidified microstructures were characterized as a function of temperature gradient ahead of the solidification front and the solidification velocity. The experimental results are presented in form of stability diagrams for the three microstructures. The inter fiber spacing is analyzed and presented in from of Jackson and Hunt type relations. The transitions between the microstructures are discussed in view of new hypotheses for the transition from fibers to string of pearls and the origin of irregular droplets.

Document Type:Book Section
Title:Monotectic growth morphologies and their transitions
AuthorsInstitution or Email of Authors
Seifert, MartinUNSPECIFIED
Kasperovich, GalinaUNSPECIFIED
Date:October 2008
Journal or Publication Title:Phase transformations in Multicomponent Melts
Page Range:pp. 39-54
Herlach, DieterUNSPECIFIED
Keywords:Monotectic alloys, solidification, morphological transition
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 Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prof. Lorenz Ratke
Deposited On:20 Oct 2008
Last Modified:27 Apr 2009 15:16

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