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Spinodally decomposed patterns in rapidly quenched Co-Cu melts

Galenko, Peter and Herlach, D.M. and Holland-Moritz, Dirk and Kolbe, Matthias and Davydov, Evgeny and Wanderka, Nelia (2011) Spinodally decomposed patterns in rapidly quenched Co-Cu melts. 14th International Conference on Rapidly Quenched and Metastable Materials, 28.-Aug.-2. Sept. 2011, Salvador, Brasilien.

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Abstract

The Co-Cu system is analyzed in the region of metastable miscibility gap with separation of the undercooled melt into Co-rich and Cu-rich liquids [1]. Phase separation of undercooled and quenched samples of Co50Cu50 melt are investigated experimentally using electromagnetic levitation (EML) technique, quenching the undercooled melt onto a Pb-solder coated copper chill substrate and by splat quenching methods. It is found that quenching of the liquid samples with cooling rates of 106-107 K/s leads to a frozen in microstructure of spinodally decomposed liquids. The composition of the Co-rich phase measured by TEM-EDS is Co71.7Cu28.3 and that of the Cu-rich phase is Co26.8Cu73.2. These compositions are inside the spinodal region and close to the calculated spinodal boundary in the phase diagram of the Co-Cu system. The spinodally separated samples have periodicity of mean distance between patterns of about 0.12-0.4 μm. Using the model of fast spinodal decomposition (see Ref. [2] and references therein), computational modelling is carried out using semi-implicit numeric scheme as described in Ref. [3]. The results of modelling confirm the ability to quantitatively reproduce experimentally frozen spinodal patterns by their periodicity. The calculated time for the complete phase separation into the Co-rich and Cu-rich phases (in evolution spinodally decomposing patterns) is greater than the time for samples solidifying at cooling rates of 106-107 K/s. References [1] M. Kolbe, C.D. Cao, X.Y. Lu, P.K. Galenko, B. Wei, D.M. Herlach, Materials Science and Engineering A 375-377, 520 (2004). [2] P. Galenko, D. Jou, Physica A 388, 3113 (2009). [3] N. Lecoq, H. Zapolsky, P. Galenko, The European Physical Journal ST 177 165 (2009).

Document Type:Conference or Workshop Item (Poster)
Title:Spinodally decomposed patterns in rapidly quenched Co-Cu melts
Authors:
AuthorsInstitution or Email of Authors
Galenko, Peterpeter.galenko@dlr.de
Herlach, D.M.dieter.herlach@dlr.de
Holland-Moritz, Dirkdirk.holland-moritz@dlr.der
Kolbe, Matthiasmatthias.kolbe@dlr.de
Davydov, Evgenyevgeny.davydov@dlr.de
Wanderka, NeliaHMI Berlin
Date:August 2011
Status:Published
Keywords:Spinodal decomposition, undercooled melts
Event Title:14th International Conference on Rapidly Quenched and Metastable Materials
Event Location:Salvador, Brasilien
Event Type:international Conference
Event Dates:28.-Aug.-2. Sept. 2011
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: Dr.rer.nat. Dirk Holland-Moritz
Deposited On:17 Oct 2011 10:35
Last Modified:17 Oct 2011 10:35

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