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Heat flow parameters affecting dendrite spacings during unsteady-state solidification of Sn-Pb and Al-Cu alloys

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Abstract

Solidification thermal parameters and dendrite arm spacings have been measured in hypoeutectic Sn-Pb and Al-Cu alloys solidified under unsteady-state heat flow conditions. It was observed that both primary and secondary spacings decreased with increased solute content for Sn-Pb alloys. For Al-Cu alloys, the primary spacing was found to be independent of composition, and secondary spacings decrease as the solute content is increased. The predictive theoretical models for primary spacings existing in the literature did not generate the experimental observations concerning the Sn-Pb and Al-Cu alloys examined in the present study. The theoretical Bouchard-Kirkaldy’s (BK’s) equation relating secondary spacings with tip growth rate has generated adequately the experimental results for both metallic systems. The insertion of analytical expressions for tip growth rate and cooling rate into the predictive model, or into the resulting experimental equations in order to establish empirical formulas permitting primary and secondary dendritic spacings to be determined as functions of unsteady-state solidification parameters such as melt superheat, type of mold, and transient metal/mold heattransfer coefficient is proposed.

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Authors and Affiliations

  1. the Department of Materials Engineering, State University of Campinas—Unicamp, 13083-970, Campinas-SP, Brazil

    Otávio L. Rocha (Doctorate Student and Research Assistant), Cláudio A. Siqueira (Doctorate Student and Research Assistant) & Amauri Garcia (Professor)

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  1. Otávio L. Rocha
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  2. Cláudio A. Siqueira
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  3. Amauri Garcia
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Rocha, O.L., Siqueira, C.A. & Garcia, A. Heat flow parameters affecting dendrite spacings during unsteady-state solidification of Sn-Pb and Al-Cu alloys. Metall Mater Trans A 34, 995–1006 (2003). https://doi.org/10.1007/s11661-003-0229-3

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  • DOI: https://doi.org/10.1007/s11661-003-0229-3

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