The Effects of Pre-strain and Subsequent Annealing on the Yielding Behavior in a Rolled Magnesium Alloy AZ31

In present work, pre-compression along the transverse direction and the normal direction (ND) was conducted on the rolled AZ31Mg alloy. Subsequently, the pre-compressed samples were annealed at 250 °C for different times. The effects of pre-compression and post-annealing on the yielding behavior during subsequent compression along ND were investigated. The results revealed that a lot of non-recrystallized extension twin remained in 5% PT sample after annealing for 4 h, while no twin was observed in the 5% PN sample, under the same annealing time. Along with, no prominent changes occurred in the texture of post-annealed as compared to pre-compressed samples. Due to the grain refinement caused by static recrystallization, yield strength increase of 5% PNA sample is found for an annealing time of 30 min. For the 5% PTA sample, the strength increase is attributed to annealing hardening (i.e., annealing retards the detwinning activity and consequently increase the yield strength).