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Type: Artigo de periódico
Title: Cellular growth during the transient directional solidification of Zn-rich Zn-Cu monophasic and peritectic alloys
Author: Brito, C
Siqueira, CA
Spinelli, JE
Garcia, A
Abstract: Zn-Cu alloys located in the monophasic and hypoperitectic ranges of compositions of Zn-rich Zn-Cu alloys were directionally solidified under unsteady-state heat flow conditions. The experimental cooling curves allow solidification thermal parameters: tip cooling rate ((T) over dot), tip growth rate (V-L) and temperature gradient (G(L)) to be experimentally determined. The observed microstructural evolution of both alloys has shown that a regular cellular morphology prevails along the whole castings lengths. Only the regions very close to the cooled casting surface showed the presence of plate-like cells due to very high cooling rates (higher than 25 K/s). The cell spacing (lambda(c)) was measured along the castings lengths, and experimental correlations between lambda(c) and experimental solidification thermal parameters have been established. Power laws with -0.55 and -1.1 exponents expressing lambda(c) as a function of (T) over dot and V-L, respectively, were found to better represent the growth of cells under transient heat flow conditions for both alloys experimentally examined. The predictions furnished by the Hunt-Lu model underestimate the experimental cell spacings found for both alloys examined. It was shown that the proposed equations relating lambda(c) as a function of (T) over dot are able to represent both the steady-state and unsteady-state cellular growth of monophasic and peritectic Zn-rich Zn-Cu alloys. (C) 2012 Elsevier Ltd. All rights reserved.
Subject: Alloys
Crystal growth
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: Journal Of Physics And Chemistry Of Solids. Pergamon-elsevier Science Ltd, v. 73, n. 9, n. 1173, n. 1181, 2012.
Rights: fechado
Identifier DOI: 10.1016/j.jpcs.2012.05.014
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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