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Author
Bartumeus Vallespí, Daniel
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Abstract
Aluminium is the third most abundant element in the earth's crust (after oxygen and silicon) and constitutes 8% of its mass. It is a non-ferrous metal with a silvery-white colour, light, very ductile and malleable (even at room temperature) and 100% recyclable without loss of prop-erties. It also has relatively low mechanical characteristics and is therefore often alloyed with other elements to improve them.
In this work, the recrystallisation of aluminium 5754 and 5083, two aluminium alloys containing magnesium as the main alloying element in different proportions, is studied. To this end, sev-eral mechanical tests of pristine and heat-treated specimens are analysed and carried out between 100 and 550ºC for a time of 1, 2 and 12 hours. Tensile tests are performed to obtain stress-strain diagrams, maximum tensile strength, strain at fracture and toughness; hardness tests to measure the resistance to plastic deformation at the base and at the tip of the speci-mens; and x-ray diffraction analysis to identify the pattern that best fits the samples, to distin-guish grains oriented in a particular crystallographic direction and to pre-specify the residual stresses stored in the samples after the heat treatments and/or tests undertaken.
The results obtained are then analysed and the effect of recrystallisation on the behaviour and mechanical properties of the treated aluminium is detailed. In this way, it is possible to determine which aluminium alloy with magnesium as the main alloying element is most suit-able for application in a specific field.
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