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Thermal analysis during solidification of an Al–Cu eutectic alloy: interrelation of thermal parameters, microstructure and hardness

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Abstract

Eutectic alloys are considered promising candidates for high-temperature structural applications. In spite of this, quantitative examination of the effect of the length scale of the eutectic microstructure on mechanical properties remains a challenge. In this sense, assessments of morphology, size and distribution of the phases forming the eutectic mixture, solidified under transient regime and different cooling conditions, endure necessary. In the present study, a large spectrum of cooling rates has been obtained during unsteady-state directional solidification of an Al–33 mass% Cu alloy. The main techniques utilized were: optical microscopy; scanning electron microscopy with X-ray energy-dispersive spectroscopy, X-ray fluorescence spectroscopy and Vickers hardness (HV). The resulting microstructures related to various solidification cooling rates are shown to be formed by eutectic colonies. Three microstructural zones constitute the colony, that is, a fine central regular lamellar Al–Al2Cu eutectic, an intermediate narrow wavy lamellar eutectic and a coarse boundary eutectic zone. Iron impurity appears to be able to degenerate the eutectic into a more randomly distributed microstructure. The colonies’ morphology exhibits a transition from regular to platelike cells with the increase in cooling rate. Furthermore, the evolution of hardness as a function of the colony spacings is outlined. The highest hardness of 200 HV is related to an ultrafine bimodal structure formed by platelike eutectic colonies with 13 µm in spacing with very fine lamellae of 330 nm in spacing.

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Acknowledgements

The authors are grateful to FAPESP (São Paulo Research Foundation, Brazil: Grant 2017/12741-6) and CNPq - National Council for Scientific and Technological Development for their financial support.

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Authors and Affiliations

  1. Department of Manufacturing and Materials Engineering, University of Campinas UNICAMP, Campinas, SP, 13083-860, Brazil

    Rafael Kakitani, Amauri Garcia & Noé Cheung

  2. Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP, 13565-905, Brazil

    Guilherme Lisboa de Gouveia & José E. Spinelli

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  1. Rafael Kakitani
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  2. Guilherme Lisboa de Gouveia
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  3. Amauri Garcia
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  5. José E. Spinelli
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Correspondence to José E. Spinelli.

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Kakitani, R., de Gouveia, G.L., Garcia, A. et al. Thermal analysis during solidification of an Al–Cu eutectic alloy: interrelation of thermal parameters, microstructure and hardness. J Therm Anal Calorim 137, 983–996 (2019). https://doi.org/10.1007/s10973-018-07992-x

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