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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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 . 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.  and references therein), computational modelling is carried out using semi-implicit numeric scheme as described in Ref. . 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  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).  P. Galenko, D. Jou, Physica A 388, 3113 (2009).  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|
|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|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialwissenschaftliche Forschung (old)|
|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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