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Colloids as model systems for undercooled metallic melts

Klassen, Ina and Wette, Patrick and Holland-Moritz, Dirk and Herlach, Dieter and Palberg, Thomas (2010) Colloids as model systems for undercooled metallic melts. TMS. TMS2010 Annual Meeting, Seattle, USA.

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Official URL: http://www.materialstechnology.org

Abstract

We present investigations of short-range order (SRO) of charged colloidal suspension by applying Ultra-Small-Angle X-ray Scattering using synchrotron radiation at DESY Hamburg. The colloidal system is shear melted, subsequently, it is in a liquid state far from equilibrium. The development of the structure factor is measured as a function of time after shear melting. The deviation from equilibrium is determined by the difference of the chemical potential between solid and liquid state. The structure factors as measured are analysed within a cluster model. The results reveal the preference of icosahedral SRO in the metastable liquid colloidal system. With decreasing deviation from equilibrium the icosahedral SRO is reduced and eventually vanishes at equilibrium. The SRO of the stable liquid state is determined to be fcc like. The results obtained from the colloidal suspensions are compared with previous investigations of SRO in undercooled melts of pure metals studied by elastic neutron diffraction.

Document Type:Conference or Workshop Item (Speech)
Title:Colloids as model systems for undercooled metallic melts
Authors:
AuthorsInstitution or Email of Authors
Klassen, Inaina.klassen@dlr.de
Wette, PatrickUNSPECIFIED
Holland-Moritz, DirkUNSPECIFIED
Herlach, DieterUNSPECIFIED
Palberg, ThomasUniversität Mainz
Date:16 February 2010
Page Range:p. 153
Publisher:TMS
Series Name:139th Annual Meeting & Exhibition
Status:Published
Keywords:Phase Transformations
Event Title:TMS2010 Annual Meeting
Event Location:Seattle, USA
Event Type:international Conference
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: Dieter Herlach
Deposited On:25 Feb 2010 13:35
Last Modified:25 Feb 2010 13:35

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