Effect of Sr on the Microstructure and Properties of Mg-6Al Alloy

In this study, microstructures and properties of the Mg-Al alloy with strontium addition are studied. After the addition of strontium structure analysis was performed to investigate phase evaluation. The potentiostatic measurements were also carried out in 3.5% NaCl solution with the results showing that the effect of adding strontium element to magnesium- aluminum alloys on corrosion behavior of this metal was strongly dependent on microstructure of the final alloy (e.g. grain size, type, intermetallic compounds, etc.). The major second phase included Al4Sr and Al2Sr, but the amount and morphology of these compounds was different in the alloys. The results indicated a reduction in the amount of Mg-17 Al-12 phase and corrosion rate as well as a rise in the resistance to cavitations.