Influence of short-term heat treatment on the mechanical properties of AlMgSi profilesWednesday (08.11.2017) 15:40 - 16:00 Part of:
In the frame of this investigation the influence of heat treatment, including short-term heat treatment, on the mean variation of yield strength and tensile strength of aluminium profiles is investigated. A commmercial EN AW-6060 alloy of high purity was used, being a typical material for decorating details in the automotive industry. After hot extrusion, these profiles can be easily processed to obtain a brilliant surface. However, variations in mechanical properties impair post-processing to the final geometry. Therefore, the ambition of this work was the identification of minor and major influencing factors.
Different profile geometries made of EN AW-6060 were investigated in different conditions of artificial aging. The temperature was varied from 120°C to 230°C. Tensile test, used as the main measurement method, focused on the mean variation of Rm and Rp0,2. Minor changes in the chemical composition were found to exert a major influence on the final properties while position in the extrusion block, segregations and degree of natural ageing turned out to be less significant. Furthermore, the geometry of the profiles did not influence the measured data significantly. Another point of interest was the effect of a short-term heat treatment on the degree of natural aging with the ambition to stabilize the microstructure prior to artifical ageing. Short-term heat treatment is shown to delay the natural aging by almost 4 days, however, the variation of mechanical properties is increased. An inhomogeneous temperature profile during short-term heat treatment was identified to be the reason for this result.
Finally, a strategy for minimizing variations in mechanical properties of artificially aged aluminium alloys was developed based on the experimental results of this study.
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