Constitutive Equations in Creep of the AE44 Magnesium Alloy

Stefano Spigarelli

doi:10.4028/www.scientific.net/MSF.604-605.357

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Constitutive Equations in Creep of the AE44 Magnesium Alloy

Abstract:

The creep behaviour of the AE44 magnesium alloy was described by means of a variation of the composite model, already successfully used to analyse the behaviour of die-cast Mg-Al alloys. Since the microstructure of these alloys is constituted by primary Mg globules surrounded by a divorced eutectic formed by supersaturated a-Mg and precipitates, these materials were compared to a composite with soft (globules) and hard (divorced eutectic) regions, both deforming with a similar strain rate during creep. The strengthening role of the precipitates formed in the hard region during cooling from injection temperature and during creep was expressed by introducing a threshold stress. The agreement between experimental data and model was very good.