Effect of forging on microstructure, texture and compression behavior of extruded AZ31B

Abstract

Forging is a common method employed in the fabrication of automotive components. In this study, extruded AZ31B magnesium alloy was semi-close die forged at a temperature of 500 °C with a ram rate of 40 mm/s. Microstructural study indicated a bimodal grain structure with weaker texture in the forged material compared to the as-extruded material. Uniaxial compression tests indicated a remarkable improvement of fracture strain from 36 to 61% with a reduction of ultimate compressive strength between 4 and 22% in the forged samples compared to the as-extruded samples. It is attributed to the modification of microstructure and texture decreases twinning and increases the slipping activity resulting the improvement of ductility and reduced strength at room temperature.