Characterization and Modelling of the Precipitation Sequence of an Al-Mg-Si Alloy with Silicon Excess for the Prediction of the Mechanical Properties during Ageing

Abstract:

The precipitation sequence of an Al-Mg-Si alloy with silicon excess was determined between 150°C and 300°C by combining ThermoElectric Power measurements and Transmission Electron Microscopy observations. From these studies, an experimental Isothermal Transformation Curve could be proposed in the investigated temperature range. After calibration of a model of KWN type allowing the simultaneous precipitation of two types of metastable rod-shaped precipitates to be taken into account, the same type of curve could be obtained and the yield strength evolution of the alloy during isothermal ageing treatments could be predicted.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1161-1166
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1161
• Online since: December 2018
• Authors: Veronique Massardier*, Gwenaelle Meyruey, Michel Perez
• Keywords: Ageing, Al-Mg-Si Alloy, Modelling, Precipitation, TEM, Thermoelectric Power

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