Constitutive Equations in Creep of the AE44 Magnesium Alloy

Abstract:

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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.

Info:

Periodical:

Materials Science Forum (Volumes 604-605)

Edited by:

Marcello Cabibbo and Stefano Spigarelli

Pages:

357-365

DOI:

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

Citation:

S. Spigarelli "Constitutive Equations in Creep of the AE44 Magnesium Alloy", Materials Science Forum, Vols. 604-605, pp. 357-365, 2009

Online since:

October 2008

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$35.00

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