2711 Effect of Al Content on Susceptibility to Stress Corrosion Cracking of Magnesium Alloys

Abstract

Magnesium alloy, especially Mg-Al-Zn ally is popular and widely used in wide variety of imdustrial applications. However, the magnesium alloy that contains aluminum generally susceptible to stress corrosion cracking (SCC). In this study, the effect of Al content on the susceptibility to SCC of magnesium alloys (AZ10, AZ31, AZ61, AZ91) was investigated with slow strain rate technique (SSRT) in 0.004wt% sodium chloride solutions at 298K. In magnesium alloys, the occurrence of general corrosion is suppressed and the SCC susceptibility increases when aluminum content becomes high. All SCC fracture surfaces of magnesium alloys are characterized by transgranular quasi-cleavage appearance.