Study on Flow Stress of AZ61 Magnesium Alloy in Hot Compression Deformation

Hot compression experiments of AZ61 magnesium alloy was performed on Gleeble-1500 thermal simulation testing machine,then the compression flow stress of the alloy was analyzed under the different deformation temperatures and strain rates.The relationship among the flow stress,the deformation temperatures and the strain rates was studied during hot deformation of AZ61 magnesium alloy,and the corresponding model of flow stress was established.The results showed that the flow stress increased with the strain rate increasing at the constant temperature,and the flow stress decreased with the deformation temperature increasing at the constant strain rate during the hot compression deformation of AZ61 magnesium alloy.The process of the hot deformation of AZ61 magnesium alloy had been characteristic of dynamic recrystallization all the time a little obviously,in which its flow stress was affected by the combination of work-hardening and dynamic recrystallization softening.It was indicated that during the hot compression,the peak value of flow stress of AZ61 magnesium alloy could be depicted by the hyperbolic-sine mathematical model preferably.