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Influence of microgravity on spinodal decomposition in a binary metallic system

Galenko, Peter and Herlach, Dieter (2011) Influence of microgravity on spinodal decomposition in a binary metallic system. 4th Int. Symposium on Physical Sciences in Space, 11. - 15. Juli 2011, Bad Godesberg, Deutschland.

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Abstract

Processes of phase separation and phase segregation evolving through spontaneous growth of fluctuations, e.g., through fluctuations of concentration in liquid-liquid and solid-solid systems or fluctuations of density in gas-liquid systems are known as spinodal decomposition. In the present work we verify the role of forced convective flow arising in experiments on the Ground and its absence under microgravity on the spinodal decomposition in binary metallic undercooled liquid. To give interpretation of the observed non-equilibrium phenomena, we use a model of spinodal decomposition [1] which allows us to describe early and late stages of phase separation under arbitrary quenching depth into spinodal region of phase diagram. Main characteristics of the model (e.g., structure factor and amplification rate on spinodal decomposition) were investigated recently in details [2-4]. The model is extended for the case of forced convective flow and the dynamics of spinodal decomposition is modelled in one and three spatial dimensions using computational methods of solution of the hyperbolic differential equations. Using the model predictions, several verifications of spinodal decomposition under microgravity and on the Ground are established. We acknowledge support from DFG (German Research Foundation) under the Project No. HE 160/19 and DLR Space Management under contract 50WM1140.

Document Type:Conference or Workshop Item (Poster)
Title:Influence of microgravity on spinodal decomposition in a binary metallic system
Authors:
AuthorsInstitution or Email of Authors
Galenko, Peterpeter.galenko@dlr.de
Herlach, Dieterdieter.herlach@dlr.de
Date:13 July 2011
Keywords:Undercooling of Materials
Event Title:4th Int. Symposium on Physical Sciences in Space
Event Location:Bad Godesberg, Deutschland
Event Type:international Conference
Event Dates:11. - 15. Juli 2011
Organizer:Institut für Materialphysik im Weltraum, DLR Köln, und ESA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialforschung unter Mikro-g
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dieter Herlach
Deposited On:28 Jul 2011 15:06
Last Modified:28 Jul 2011 15:06

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