@article{099f2d5145324a14a68f8dfd4f05db5b,
title = "On the length-scale and location of channel nucleation in directional solidifaction",
abstract = "This work provides evidence that channels in directionally solidified hypoeutectic Pb-Sn alloy nucleate at the dendrite tips. Using a finite-element simulator, distinctive 'convective signatures' are shown to exist for stable and unstable cases, where the stability of a system is shown to be largely a function of the thickness of an inverted density layer that can exist ahead of the moving solidification front. The thickness of this layer, and therefore, the stability of the systems studied, is shown to largely be a function of the length scale D/V, where it is shown that channeling can be turned on or off simply by changing this length scale.",
keywords = "Directional solidification, Freckles, Pb-Sn, Rayleigh number, Single crystal, Turbine blades",
author = "C. Frueh and Poirier, {D. R.} and Erdmann, {R. G.} and Felicelli, {S. D.}",
note = "Funding Information: This work was partially supported by the United States Department of Energy under Contract No. DE-AC04-94AL85000 and by NASA under grant NCC8-96. One of the authors (C. Frueh) appreciates the support of Sandia's Materials and Process Center. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy. D.R. Poirier and S.D. Felicelli appreciate support provided by the Division of International Programs of the National Sciences Foundation (United States) and by Consejo National de Investigaciones Cient{\'ı}ficas y T{\'e}cnicas (Argentina), under the frame of the international cooperation project, {\textquoteleft}Simulations of Defects in Castings{\textquoteright}. The authors appreciate the assistance of S.N. Tewari, Cleveland State University (Cleveland, OH), who provided experimental conditions that were used in our simulations. S.D. Felicelli appreciates a grant provided by Agencia Nacional de Promocion Cientifica y Tecnologica (PICT98 12-03239). ",
year = "2003",
month = mar,
day = "25",
doi = "10.1016/S0921-5093(02)00465-3",
language = "English (US)",
volume = "345",
pages = "72--80",
journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier Ltd",
number = "1-2",
}