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Heterogeneous nucleation in liquid immiscible alloys

Köhler, Markus and Ratke, Lorenz (2010) Heterogeneous nucleation in liquid immiscible alloys. In: TMS 2010 Collected Proceedings. TMS2010 Annual Meeting, 14.-18. Feb. 2010, Seattle, USA.

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Abstract

Alloys being immiscible in the liquid state decompose into two liquid phases during cooling through the miscibility gap. In contrast to solidification where the solid phase is generally nucleated at inocculants or container walls, liquid immiscible alloys are thought to decompose via homogeneous nucleation. The process is badly investigated. Therefore we study heterogeneous nucleation in Al-base immiscible alloys (Al-Pb, Al-Bi) induced by inocculants like TiB2, TiC and ZrO2. We present experimental results on Al-Pb alloys cooled with different amounts of TiB2 and ZrO2 through the miscibility gap. The microstructrue is analysed in 2D with SEM and light microscopy and also in 3D using x-ray tomography. The experiments show a pronounced effect of the inocculants. The average Pb drop size changes as well as the size distribution. The experimental results are discussed with respect to classical theories of heterogeneous nucleation and newer models of nucleation and growth by Greer and co-workers.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Heterogeneous nucleation in liquid immiscible alloys
Authors:
AuthorsInstitution or Email of Authors
Köhler, Markusmarkus.koehler@dlr.de
Ratke, LorenzUNSPECIFIED
Date:16 February 2010
Journal or Publication Title:TMS 2010 Collected Proceedings
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:monotectics, nucleation, tomography, casting, grain refiner
Event Title:TMS2010 Annual Meeting
Event Location:Seattle, USA
Event Type:international Conference
Event Dates:14.-18. Feb. 2010
Organizer:The Minerals, Metals & Materials Society
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: Markus Köhler
Deposited On:05 Mar 2010 08:12
Last Modified:05 Mar 2010 08:12

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