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Author
Alemany Ferrer, Inés
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Abstract
Aluminum alloys, due to their low density, are considered very useful for the manufacture of structural parts in automotive and aeronautics. The alloys studied in this research correspond to the 6xxx and 5xxx series and will be subjected to different heat treatments such as annealing, tempering and precipitation hardening to observe their influence on the hardness of the materials.
Specifically, the alloys selected for this study are: 5754 alloy and 6082 alloy. These have been heat treated, with respect to annealing, at 300 ºC, 450 ºC, 500 ºC and 560 ºC, and in terms of temper, at 300 ºC, 450 ºC, 500 ºC, 530 ºC, 560 ºC and 575 ºC for 60 minutes. Likewise, for alloy 6082, after hardening, subsequent aging is carried out at 100ºC, 140ºC, 180ºC, 220ºC and, finally, natural aging. Next, Vickers hardness tests are carried out in which the change in hardness that the materials are undergoing can be verified. The results are presented in column graphs that show the hardness of the different thermal treatments and in graphs with different X-ray diffractograms where the sizes of the grains of the structures themselves are shown.
The 6082 aluminum alloy is the only one that presents acceptable responses to aging and, consequently, this treatment is only performed on it. This alloy contains magnesium and silicon, allowing precipitation hardening. On the contrary, for the 5754 alloy it is theoretically obtained that aging will not be effective. The reason for this is that it only presents magnesium as an aliable element and, therefore, an experimental design with respect to aging will not be carried out.
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