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Structural Characterization of the Rolled and Annealed 7475 Aluminum Alloy

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Abstract

Aluminum alloys have been extensively employed in industrial applications due, among other things, to low cost and small weight. The purpose of this work was to investigate the Vickers hardness, tensile strength (at different temperatures) and microstructure (X-Ray diffraction, scanning and transmission electron microscopy analysis) of the 7475-T7351 aluminum alloy (5.67%Zn, 2.38%Mg, 1.78%Cu and 0.28%Fe + Si) after being submitted to rolling (at room and cryogenic temperatures) and annealing treatments (at 200 and 300 °C/15 min). Based on the results, the condition that was just rolled and subsequently subjected to annealing heat treatments (200 and 300 °C) showed higher mechanical properties obtained at room temperature and hot (250 and 350 °C) tensile test than that were submitted to the intermediate annealing heat treatment between the rolling steps. This fact is possibly due to the intermediate heat treatment, which caused a thickening of the precipitates, and consequently a lower microstructural stability.

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Acknowledgments

The authors thank CAPES for a PhD scholarship (2014-2017/DINIZ, S.B.); the National Synchrotron Light Laboratory (LNLS), for help in the H_TT measurements; Universidade Federal Fluminense (UFF), for the RR_TT measurements; Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (CEFET/RJ—Maracanã) for the use of the Instron Wolpert durometer; Universidade Federal do Rio de Janeiro (UFRJ/COPPE), for preparing the samples for TEM imaging.

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  1. Departamento de Engenharia Metalúrgica, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Angra dos Reis, RJ, Brazil

    Saulo Brinco Diniz

  2. Instituto Militar de Engenharia, Rio de Janeiro, RJ, Brazil

    Andersan dos Santos Paula & Luiz Paulo Mendonça Brandão

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  1. Saulo Brinco Diniz
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Correspondence to Saulo Brinco Diniz.

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Diniz, S.B., dos Santos Paula, A. & Brandão, L.P.M. Structural Characterization of the Rolled and Annealed 7475 Aluminum Alloy. J. of Materi Eng and Perform 32, 718–727 (2023). https://doi.org/10.1007/s11665-022-07120-9

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