Effect of Lean Alloyed Al and Ca on the Texture Development of Cold Rolled Mg Sheets

Abstract

Lean alloyed Mg-Al-Ca alloys reveal weakened basal-type texture intensities and increased room-temperature ductility when compared to pure Mg. Since the combined effects of the alloying elements Al and Ca on texture evolution are not yet fully understood, in this study, two binary and seven ternary Mg-Al-Ca alloys (ranging between 0–2 wt.-% Al and 0–0.5 wt.-% Ca) were subjected to cold rolling with texture measurement after each rolling step. These measurements showed that the basal-type texture of Mg is weakened by the addition of Ca, while the addition of Al leads to stronger basal-type textures compared to the samples containing Ca. The joint effect of Al and Ca can, for specific alloy compositions, lead to a steady-state basal texture intensity, which does not become stronger with further rolling. We expect that the solubility limit of Ca in Mg affects this behaviour. For comparison, mechanical properties were obtained by compression testing, showing high degrees of deformation, of 15–25%.

Keywords

• Mg-Al-Ca alloys
• solid solution
• cold rolling
• mechanical properties
• scanning electron microscopy