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Abstract
The effect of prestraining on the natural ageing and artificial ageing of an aluminum alloy 6022 (Al-0.6 Mg-1.0 Si) has been investigated in this study. The precipitation behaviours of samples of the alloy were analyzed using differential scanning calorimetry (DSC) as well as by measuring the electrical conductivity and confirmed by microstructure observation using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Tensile tests and microhardness measurements were performed to determine the mechanical properties of the samples.
The results indicate that the dislocations would not only suppress clustering during natural ageing but would also provide heterogeneous nucleation sites. These are particularly noteworthy results, that 2% prestraining leads to a significant reduction in the detrimental effects of 30 days of natural ageing on the artificial ageing at 170 °C for 30 minutes and provides sufficient formability to make the part and a high strength after the artificial ageing.
The effect of prestraining on the natural ageing and artificial ageing of an aluminum alloy 6022 (Al-0.6 Mg-1.0 Si) has been investigated in this study. The precipitation behaviours of samples of the alloy were analyzed using differential scanning calorimetry (DSC) as well as by measuring the electrical conductivity and confirmed by microstructure observation using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Tensile tests and microhardness measurements were performed to determine the mechanical properties of the samples.
The results indicate that the dislocations would not only suppress clustering during natural ageing but would also provide heterogeneous nucleation sites. These are particularly noteworthy results, that 2% prestraining leads to a significant reduction in the detrimental effects of 30 days of natural ageing on the artificial ageing at 170 °C for 30 minutes and provides sufficient formability to make the part and a high strength after the artificial ageing.
Dans cette étude, on a investigué l'effet de la pré-sollicitation sur le vieillissement naturel et artificiel d'un alliage d'aluminium 6022 (Al-0.6 Mg-1.0 Si). On a analysé le comportement de précipitation des échantillons de l'alliage en utilisant la calorimétrie à balayage différentielle (DSC) ainsi qu'en mesurant la conductivité électrique et en confirmant par observation de la microstructure en utilisant la microscopie électronique conventionelle (TEM) et la microscopie électronique à balayage (SEM). On a effectué des essais de traction et des mesures de microdureté pour déterminer les propriétés mécaniques des échantillons.
Les résultats indiquent que les dislocations non seulement supprimeraient l'agrégation lors du vieillissement naturel mais fourniraient également des sites de nucléation hétérogènes. Il y a des résultats particulièrement remarquables, par exemple, qu'une pré-sollicitation de 2% amène une réduction importante des effets détrimentaux d'un vieillissement naturel de 30 jours sur le vieillissement artificiel à 170 °C pendant 30 min et fournit une formabilité suffisante pour fabriquer la pièce ainsi qu'une résistance élevée après le vieillisssement artificiel.