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Tailoring of Processing Parameters, Dendritic Microstructure, Si/Intermetallic Particles and Microhardness in As-cast and Heat-Treated Samples of Al7Si0.3Mg Alloy

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Abstract

In this work, solidification and T6-heat treatment experiments were performed with the Al7Si0.3Mg alloy in order to investigate the effect of processes parameters on the microstructure and microhardness (HV). A directional solidification device was used, and the solidification thermal parameters investigated were the growth and cooling rates (VL and TR). The heat treatment applied was the T6 (T6-HT), under the following conditions: solution treatment for 3 h at 520 ± 2 °C, followed by quenching in warm water (70 ± 20 °C), aging for 1, 2, 3 and 4 h at 155 ± 2 °C and air-cooling. The microstructure observed in both as-cast and T6-heat treated samples is composed of a primary phase consisting of an Al-rich dendritic network and secondary eutectic phases, located within the interdendritic regions, formed by Si and Mg2Si particles and Fe-intermetallic phases. The dendritic microstructure was characterized by secondary dendritic spacing (λ2) and, for both investigated samples, a single mathematical expression was proposed on the λ2 dependence with the position in the ingot. Spheroidized-like eutectic Si particles have been found in both analyzed samples for finer microstructures. Elements quantitative and qualitative microanalysis by SEM/EDS as well as HV measurement at the dendritic and interdendritic regions attest to the effectiveness of the T6-heat treatment. It is highlighted in this work that mathematical expressions have been proposed to characterize the HV dependence on aging time.

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Acknowledgements

The authors acknowledge the financial support provided by IFPA—Federal Institute of Education, Science and Technology of Pará, UFPA—Federal University of Pará, and CNPq—The Brazilian Research Council (Grants 302846/2017-4 and 400634/2016- 3) and CAPES—Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil – Finance Code 001.

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Authors and Affiliations

  1. Federal Institute of Education, Science and Technology of Pará-IFPA, Belém, PA, 66093-020, Brazil

    Carolina R. Barbosa, Gabriel H. Machado, Hugo M. Azevedo, Fernando S. Rocha & Otávio L. Rocha

  2. Institute of Technology, Federal University of Pará-UFPA, Belém, PA, 66075-110, Brazil

    José C. Filho & Otávio L. Rocha

  3. Estácio College of Belém, Belém, PA, 66055-260, Brazil

    Arielly A. Pereira

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  1. Carolina R. Barbosa
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Barbosa, C.R., Machado, G.H., Azevedo, H.M. et al. Tailoring of Processing Parameters, Dendritic Microstructure, Si/Intermetallic Particles and Microhardness in As-cast and Heat-Treated Samples of Al7Si0.3Mg Alloy. Met. Mater. Int. 26, 370–383 (2020). https://doi.org/10.1007/s12540-019-00334-y

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