Effect of Strontium on Mechanical Properties and Corrosion Resistance of AZ91D
With adding 2% strontium in AZ91D, the ultimate tensile strength and the elongation increased by 10.3% and 55.3%, respectively. This is mainly caused by the refinement of the β phase and the formation of Al4Sr strengthening phase. Furthermore, with adding 2% strontium in AZ91D alloy, the weight loss corrosion rate in 5wt.% NaCl solution decreases to 0.048 mg·cm-2·d-1, which was 33.8 % of the AZ91D corrosion rate. Therefore, the mechanical properties and corrosion resistance of AZ91D could be improved by the addition of 2% strontium, which is due to the refinement of Mg17Al12 phase and the formation of Al4Sr phase.
Yafang Han et al.
Y. Fan et al., "Effect of Strontium on Mechanical Properties and Corrosion Resistance of AZ91D", Materials Science Forum, Vols. 546-549, pp. 567-570, 2007