Evolution of the Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Sheets during Multi-Pass Lowered-Temperature Rolling

AZ31 magnesium alloy sheets with 2 mm thickness were successfully fabricated by multi-pass lowered-temperature rolling. The evolution of the microstructure, texture, and mechanical properties during rolling process was investigated. Based on effect multiple dynamic recrystallization, not only refined grain size obviously but also markedly improved microstructure homogeneity. resulting had optimal morphology an average 4.38 ?m. For texture evolution, stress state made (0002) basal plane gradually rotate toward plane. However, activation non-basal slips due to higher temperature slightly rotated point direction (RD). As a result, refinement strengthening together increased yield 202 MPa in transverse (TD) 189.8 RD. Importantly, sheet concurrently exhibited excellent fracture elongation, about 38% TD 39.2% This mainly ascribed finer size, giving rise significant boundary sliding amount slips.