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The correlation between dendritic microstructure and mechanical properties of directionally solidified hypoeutectic Al-Ni alloys

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Abstract

Al-Ni hypoeutectic alloys were directionally solidified under upward transient heat flow conditions. The aim of the present study is to set up correlations between the as-cast microstructure and the resulting mechanical properties of these alloys. The dependence of primary and secondary dendrite arm spacing on the alloy solute content and on solidification thermal parameters is also analyzed. The results include transient metal/mold heat transfer coefficient, tip growth rate, cooling rate, dendrite arm spacing, ultimate tensile strength, yield tensile strength and elongation. Expressions relating dendrite spacing to solidification thermal parameters and mechanical properties to the scale of the dendritic microstructure have been determined. It was found that the ultimate tensile strength and the yield tensile strength increase with increasing alloy solute content and with decreasing primary and secondary dendrite arm spacing. In contrast, the elongation was found to be independent of both alloy composition and dendritic arrangement.

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Authors and Affiliations

  1. Department of Materials Engineering, University of Campinas — UNICAMP, P.O. Box 6122, 13083-860, Campinas, SP, Brazil

    Manuel V. Canté, Noé Cheung & Amauri Garcia

  2. Department of Materials Engineering, Federal University of Rio Grande do Norte — UFRN, P.O. Box 1524, 59072-970, Lagoa Nova Campus, Natal, RN, Brazil

    José E. Spinelli

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  1. Manuel V. Canté
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  2. José E. Spinelli
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  3. Noé Cheung
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  4. Amauri Garcia
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Correspondence to Amauri Garcia.

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Canté, M.V., Spinelli, J.E., Cheung, N. et al. The correlation between dendritic microstructure and mechanical properties of directionally solidified hypoeutectic Al-Ni alloys. Met. Mater. Int. 16, 39–49 (2010). https://doi.org/10.1007/s12540-010-0039-2

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  • DOI: https://doi.org/10.1007/s12540-010-0039-2

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