Microstructural, Mechanical, Texture and Corrosion Properties of Severely Deformed AZ31 Alloy with Sr Addition

This study investigates the simultaneous effects of addition of different amount strontium and also parallel tubular channel angular pressing (PTCAP) method on as-cast AZ31 magnesium alloy. It was seen that adding Sr caused a significant grain refinement in which the mean grain sizes of the PTCAP-processed tubes were refined to ~ 7 μm and ~ 4.5 μm, respectively, after adding 0.7 wt.% and 1.5 wt.% Sr to AZ31 from its initial value which was 520 μm. Moreover, the precipitates fraction was calculated for 3 specimens containing 0 wt.%, 0.7 wt.%, and 1.5 wt.% of Sr. and the highest value was attained for the 1-pass processed specimen with 0.7 wt.% Sr content, which might be responsible for its high ultimate shear strength value compared to other specimens. Texture analysis showed that, by adding more Sr, the texture intensity slightly decreased, correspondingly the {0002} pole figures showed symmetry in texture components. To evaluate mechanical properties variations, the shear-punch test was accomplished. The highest values of (185 MPa) and deformation (31.6%) arose for the 1-pass- processed sample containing 0.7 wt.% Sr. Finally, the corrosion analysis showed that the corrosion rate of the 1-pass PTCAP specimen containing 0.7 wt.% Sr was promising for use in required corrosion-resistant applications.