High temperature compressive deformation behaviors of extruded AZ91 magnesium alloy
(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract: The compressive deformation behaviors of the extruded AZ91 at temperatures around the solidus were investigated. The compressive stress—strain curves were measured, and the hot deformation microstructures were observed. Dynamic recovery (DRV) and dynamic recrystallization (DRX) take place during compression. The main deformation mechanism is climbing of dislocations controlled by the lattice diffusion. The presence of the liquid relaxes the stress concentration which facilitates the deformation. Higher activation energy is attributed to the non-basal sliding in addition to the presence of liquid phases.
Key words: compression； magnesium alloy； deformation mechanism