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Investigation of nucleation in undercooled metal melts

Klein, Stefan and Herlach, Dieter (2010) Investigation of nucleation in undercooled metal melts. In: DPG Verhandlungen 2010, Condensed Matter Section, p. 534. DPG Spring Meeting, Condensed Matter Section, 21. - 26. März 2010, Regensburg.

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Abstract

Containerless processing is an effective tool for undercooling metallic melts far below their equilibrium melting temperatures. By using such levitation techniques the dominating heterogeneous nucleation on container-walls is completely eliminated. Furthermore, if the experiments are performed under clean environmental conditions, heterogeneous nucleation on free surfaces is also greatly reduced. In this work both electromagnetic and electrostatic levitation techniques are used for a comparative investigation of nucleation in undercooled metallic metals. In case of electromagnetic levitation samples in a diameter of 7 mm are processed within high purity inert gas atmosphere while in case of electrostatic levitation samples in a diameter of 2 mm are processed in ultra high vacuum. With a modified model by Skripov a statistical analysis of the distribution function of the undercoolings measured in one experiment run consisting of at least 100 undercooling cycles is conducted which provides information about the physical nature of different nucleation mechanism depending on experiment conditions. The project was funded by Deutsche Forschungsgemeinschaft, under contract No. HE 1601/21.

Document Type:Conference or Workshop Item (Speech)
Title:Investigation of nucleation in undercooled metal melts
Authors:
AuthorsInstitution or Email of Authors
Klein, Stefanstefan.klein@dlr.de
Herlach, Dieterdieter.herlach@dlr.de
Date:25 March 2010
Journal or Publication Title:DPG Verhandlungen 2010, Condensed Matter Section
Page Range:p. 534
Status:Published
Keywords:Crystal Nucleation, Electrostatic and Electromagnetic Levitation
Event Title:DPG Spring Meeting, Condensed Matter Section
Event Location:Regensburg
Event Type:international Conference
Event Dates:21. - 26. März 2010
Organizer:Deutsche Physikalische Gesellschaft
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: Dieter Herlach
Deposited On:12 Apr 2010 09:15
Last Modified:12 Apr 2010 09:15

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