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Equiaxed Dendritic Solidification Experiment (EDSE)The objective of the research is to quantitatively determine and understand the fundamental mechanisms that control the microstructural evolution during solidification of an assemblage of equiaxed dendritic crystals. A microgravity experiment will be conducted to obtain benchmark data on the transient growth and interaction of up to four equiaxed crystals of a pure and transparent metal analog (succinonitrile, SCN) under strictly diffusion dominated conditions. Of interest in the experiment are the transient evolution of the primary and secondary dendrite tip speeds, the dendrite morphology (i.e., tip radii, branch spacings, etc.) and solid fraction, the tip selection criterion, and the temperature field in the melt for a range of initial supercoolings and, thus, interaction "strengths" between the crystals. The experiment thus extends the microgravity measurements of Glicksman and coworkers for steady growth of a single dendrite [Isothermal Dendritic Growth Experiment (IDGE), first flown on USMP-2] to a case where growth transients are introduced due to thermal interactions between neighboring dendrites - a situation more close to actual casting conditions. Corresponding earth-based experiments will be conducted to ascertain the influence of melt convection. The experiments are supported by a variety of analytical models and numerical simulations. The data will primarily be used to develop and test theories of transient dendritic growth and the solidification of multiple interacting equiaxed crystals in a supercooled melt.
Document ID
19990040255
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Beckermann, C. (Iowa Univ. Iowa City, IA United States)
Steinbach, I. (Aachener Centrum fuer Erstarrung unter Schwerelosigkeit e.V. Germany)
Karma, A. (Northeastern Univ. Boston, MA United States)
deGroh, H. C., III (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
August 19, 2013
Publication Date
February 1, 1999
Publication Information
Publication: NASA Microgravity Materials Science Conference
Subject Category
Solid-State Physics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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