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The Cu/Nb Ratio Influencing Microstructure, Mechanical and Electrical Properties in As-cast Al-3Cu-xNb Alloys

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Abstract

In this work, solidification experiments were performed with Al-3CuxNb alloys (x = 0.5, 3 and 5wt.%). The role of the Cu/Nb ratio was investigated on thermal parameters such as growth and cooling rates (VL and TR), structure, microhardness (HV) and electrical properties such as electrical resistance, resistivity and conductivity (R, ρ, and σ, respectively). A columnar to equiaxed grain transition (CET) was observed for lower Cu/Nb ratios. The typical solidification microstructure was quantified by means of secondary dendritic spacings (λ2). It was observed that the decrease of the Cu/Nb ratio with the increase of the Nb content increased the HV, R, and ρ values, but the σ values decreased. It was deduced that the harder particles of the Al3Nb and Al2Cu intermetallic phases contributed to the increase of HV, while the Al3Nb phase influenced the decrease of electrical conductivity with the increase of Nb content.

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Acknowledgements

The authors acknowledge the financial support provided by IFPA—Federal Institute of Education, Science and Technology of Pará, Postgraduate Program in Materials Engineering (PPGEMat/IFPA), UFPA—Federal University of Pará, and CNPq—National Council for Scientific and Technological Development (Grant 304924/2020-2).

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Authors and Affiliations

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

    Gabriel Mendes, Thiago Dillon, Helder Rodrigues, Evaldo Hoffmann & Otávio Rocha

  2. Faculty of Mechanical Engineering, Federal University of Pará-UFPA, BelémPará, 66075-110, Brazil

    Hugo Azevedo & Otávio Rocha

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  1. Gabriel Mendes
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  2. Hugo Azevedo
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  3. Thiago Dillon
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Correspondence to Otávio Rocha.

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Mendes, G., Azevedo, H., Dillon, T. et al. The Cu/Nb Ratio Influencing Microstructure, Mechanical and Electrical Properties in As-cast Al-3Cu-xNb Alloys. Trans Indian Inst Met 76, 1453–1465 (2023). https://doi.org/10.1007/s12666-022-02863-4

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