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).
Item URL in elib: | https://elib.dlr.de/71199/ | ||||||||||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Poster) | ||||||||||||||||||||||||||||
Title: | Spinodally decomposed patterns in rapidly quenched Co-Cu melts | ||||||||||||||||||||||||||||
Authors: |
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Date: | August 2011 | ||||||||||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||||||
In SCOPUS: | No | ||||||||||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||||||||||
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: | Holland-Moritz, Dr.rer.nat. Dirk | ||||||||||||||||||||||||||||
Deposited On: | 17 Oct 2011 10:35 | ||||||||||||||||||||||||||||
Last Modified: | 17 Oct 2011 10:35 |
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