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Monotectic alloys and their growth morphologies

Ratke, Lorenz and Müller, Anja and Seifert, Martin and Kasperovich, Galina (2010) Monotectic alloys and their growth morphologies. Materials Science Forum, 649, pp. 137-142. TransTech Publications, Switzerland. DOI: doi:10.4028/www.scientific.net/MSF.649.137.

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Official URL: http://www.scientific.net


Alloys of exact monotectic composition can decompose at the monotectic temperature into 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 directional solidification of three Al-base monotectic alloys was investigated: Al-Pb, Al-In and Al-Bi utilizing aerogel base furnace technology to ensure constant gradient and solidification velocity over the processing length. The solidified microstructures are 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 showing the regions in which fibers, string of pearls or irregular morphologies exist. The inter fiber spacing is analyzed and presented in from of Jackson and Hunt type relations and the transitions between the microstructures are discussed.

Document Type:Article
Title:Monotectic alloys and their growth morphologies
AuthorsInstitution or Email of Authors
Ratke, Lorenzlorenz.ratke@dlr.de
Seifert, MartinUNSPECIFIED
Kasperovich, Galinagalina.kasperovich@dlr.de
Date:January 2010
Journal or Publication Title:Materials Science Forum
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 137-142
Publisher:TransTech Publications, Switzerland
Keywords:Monotectic alloys; solidification; morphological transitions
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:27 Jan 2010 08:53
Last Modified:27 Feb 2015 16:07

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