Effect of Aging on Yield Stress and Corrosion Resistance of Die Cast Magnesium Alloy


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Corrosion resistance is an important property that could be affected by the ageing process. In order to investigate whether aging affects the corrosion resistance, corrosion rate and yield strength of diecast magnesium alloy AZ91D were measured and analysed after ageing. It was found that the dependence of the corrosion rate on ageing time can be ascribed to the changes in microstructure of the alloy and chemical composition of its matrix. Precipitation of the β phase (Mg17Al12) occurred along the grain boundaries during the initial ageing stages, resulting in a decreasing corrosion rate and an inceasing yield strength. In the later stages, the decreasing aluminium content in the a matrix made it more active, causing an increase in the corrosion rate. The decrease in aluminium content in the matrix also leads to a decrease in yield strength.



Materials Science Forum (Volumes 488-489)

Edited by:

W.Ke, E.H.Han, Y.F.Han, K.Kainer and A.A.Luo




G. L. Song et al., "Effect of Aging on Yield Stress and Corrosion Resistance of Die Cast Magnesium Alloy", Materials Science Forum, Vols. 488-489, pp. 709-712, 2005

Online since:

July 2005




[1] A.L. Bowles, The Effect of Moderate Temperature Ageing in High Pressure Die Cast Mg-Al Alloys,. PhD Thesis, School of Engineering. (2003), Brisbane: The University of Queensland, Australia.

[2] A.L. Bowles, T.J. Bastow, C.J. Davidson, J.R. Griffiths, and P.D.D. Rodrigo, Magnesium Technology 2000, (Nashville, USA: The Minerals, Metals and Materials Society, 2000). pp.295-300.

[3] O. Lunder, J.E. Lein, T.K. Aune, and K. Nisancioglu, Corrosion, 45 (9): 741-748 (1989).

[4] C. Suman, The Effects of Direct Aging on Mechanical Properties and Corrosion Resistance of Diecast Magnesium Alloys AZ91D and AM60B, SAE Transactions, Vol. 99, No. Sect. 5 : 849-859 (1990).

DOI: https://doi.org/10.4271/900794

[5] G. Song, A. Atrens, Corrosion of Magnesium Alloys, Invited Refereed Review Article for Corrosion and Environmental Degradation of Materials: Volume 19 of the Series: Materials Science and Technology, Wiley-VCH Verlag GmbH (2000).

[6] G. Song, A. Atrens, X. Wu, B. Zhang, Corr. Sci., 40(10), 1769-1791 (1998).

[7] G. Song, A. Atrens, M. Dargush, Corr. Sci., , 41 (1999) 249.

[8] G. Song, David StJohn, International Journal of Cast Metals Research, 12: 327-334 (2000).