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

Resumo

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 Mg₁₇ Al₁₂ phase and corrosion rate as well as a rise in the resistance to cavitations.