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Kinetics of dendrite growth and dendritic fragmentation in theundercooled Co81.2Cu18.8 alloy’smelt

Published online by Cambridge University Press:  14 May 2014

P.K. Galenko ,
M. Kolbe ,
D.M. Herlach  and
M. Rettenmayr
P.K. Galenko
Affiliation:
Friedrich-Schiller-Universität Jena, Physikalisch-Astronomische Fakultät, Löbdergraben 32, 07743 Jena, Germany. e-mail: [email protected]
M. Kolbe
Affiliation:
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51147 Köln, Germany
D.M. Herlach
Affiliation:
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51147 Köln, Germany Institut für Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
M. Rettenmayr
Affiliation:
Friedrich-Schiller-Universität Jena, Physikalisch-Astronomische Fakultät, Löbdergraben 32, 07743 Jena, Germany. e-mail: [email protected]
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Abstract

The growth velocity during solidification of an undercooled melt of a Co-Cu alloyprocessed by electromagnetic levitation was measured using a high speed video camera.Applying a model of local non-equilibrium solidification, theoretical predictions ofdendrite growth velocity and dendritic growth radii are compared with high-accuracymeasurements of the growth kinetics. As the undercooling ΔT reaches a critical valueconsistent with the dendrite growth velocity being equal to the atomic diffusion speedVD in bulk liquid,ΔT =ΔT(VD),the velocity-undercooling relationship exhibits a break-point. A distinct change in thedendritic growth mechanism exists with the onset of complete solute trapping andchemically partitionless solidification of the core of the main stems of the dendritesoccurs. A complete transition to the thermally controlled growth of dendrites occurs atΔT =ΔT(VD)that leads to essential changes in the microstructure of dendritic patterns The phenomenonof dendritic fragmentation in Co-Cu melts, solidifying at ΔT <ΔT(VD),is discussed.

Keywords

undercoolingdendrite growthsolidificationmodeling
Type
Research Article
Information
Metallurgical Research & Technology , Volume 111 , Issue 5 , 2014 , pp. 295 - 303
Copyright
© EDP Sciences 2014

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