Effects of Strontium and Calcium on the Microstructure and Grain Size of Cast AZ91 Magnesium Alloy

Abstract

The experiments focused on the influence of strontium and calcium as additional alloying elements on the grain size and phase distribution of AZ91 magnesium alloys. For this purpose, different concentrations of Sr (0.01, 0.1, 0.4, and 0.8) and Ca (0.01, 0.1, 0.4, 0.6 and 0.78) were added. The microsturctural examination of specimens was made by an optical microscope and scanning electron microscope. From obtained results it was found that using 0.4 wt% strontium can provide a fine and uniform structure.