Mechanical properties at elevated temperature of a hot-deformed Mg-Al-Ca-Mn-Sr alloy

Hot-deformation was performed on a Mg-Al-Ca-Mn-Sr alloy by caliber-rolling at 773 K and its mechanical properties were investigated by tensile tests at 473 K and creep tests at 423 K. The rolled specimens showed larger and elongated grain shape along to RD compared with the as-received specimen. The anisotropy of grain growth seemed to be caused by elongated networks of eutectic intermetallic compounds during caliber-rolling. Fine recrystallized grains less than 10 μm were observed in the eight-pass specimen. The (0 0 0 2) plane texture for the rolled specimen with high total reduction (eight-pass specimen) showed stronger intensity than that for the four-pass specimen. The deformed specimens exhibited higher strength and creep resistance than the non-deformed alloy. The four-pass specimen showed the highest strength and creep resistance. This is likely to be due to superposition of the texture strengthening and the effect of coarse and elongated grain shape along to the rolling direction.