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Intergranular corrosion and mechanical property evolution in AA2024 alloy through heat treatment

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Abstract

AA2024 was developed to investigate how heat treatment might affect its mechanical and corrosion characteristics. The samples underwent different heat treatment processes: three solution heat treatments at 495 °C for 2 h followed by natural aging for 5 days, and two artificial aging treatments, one at 190 °C for 2.5 h and the other at 130 °C for 6 h. After the heat treatments, all samples were immersed in a 3% Nacl salt solution for a total of 2880 h. The metallurgical characterization of the samples was performed using optical microscopy, and scanning electron microscopy. The observations revealed the formation of corrosion product nodules on some samples, while others showed pitting corrosion, and one sample (T6) experienced intergranular corrosion. Moreover, the microstructural analysis indicated an evolution of dimples in the AA2024 T4 alloy, along with the development of fine grains compared to the non-heat-treated samples. Mechanical characterization was carried out using a Vickers hardness tester and a tensile testing machine. The Vickers hardness test showed that the AA2024 T4 sample exhibited the highest hardness value (Hv = 145) compared to the other samples. However, the tensile strength of the AA2024 alloy decreased from 512.20 MPa to 411.02 MPa after the T4 heat treatment. The yield strength (YS) and elongation properties also experienced changes after the heat treatments.

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  1. Laboratory of Energetic, Materials and Sustainable Development, University Moulay Ismail, ENSAM, 50500, Meknes, Morocco

    Fatima Ezzohra El Garchani & Moulay Rachid Kabiri

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“All authors contributed to the design and development of the study. The preparation of the material, data collection, and analysis were carried out by Fatima Ezzohra El Garchani, and Moulay Rachid Kabiri. The first draft of the manuscript was written by Fatima Ezzohra El Garchani and all authors commented on the previous versions of the manuscript. All authors have read and approved the final manuscript.

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El Garchani, F., Kabiri, M.R. Intergranular corrosion and mechanical property evolution in AA2024 alloy through heat treatment. Int J Adv Manuf Technol 128, 3273–3282 (2023). https://doi.org/10.1007/s00170-023-12161-y

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