Journal of New Technology and Materials
Volume 9, Numéro 2, Pages 28-34
2019-12-30
Influence Of Cold Deformation On The Aging Behavior Of The Al-mg-si Alloy
Authors : Aouabdia Youcef .
Abstract
The aim of the present work is to study the effect of the cold deformation followed by heat treatment on the microstructure and the mechanical properties of the alloy Al-Mg-Si. Differential scanning calorimetry indicates that precipitation of the metastable β" phase occurs in the temperature range (220-260 °C) for the solution treated and then quenched alloy to room temperature. The exploitation of the DSC curves by the Kissinger method has shown that the activation energy value of the precipitation reaction is about 83.1 k J / mole. The amount of 30% cold deformation before ageing indicates that the first dissolution reaction at about 50 ° C and the precipitation temperature is around 240 °C. Microstructural studies, of the aged cold-deformed sample, revealed the presence of fine precipitates embedded in the aluminium matrix. At as quenched state of the alloy reveals an aging response. The increase of the microhardness with the decrease of the elongation is mainly due to the severe strengthening by deformation, andnot due to the effect of precipitation hardening.
Keywords
Cold deformation ; Alloys AlMgSi ; Activation energy ; β' phase ; Precipitation
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