Deformation Behaviour and Microstructure Development of Magnesium AZ 31 Alloy During Hot and Semi‐hot Deformation

Deformation properties and microstructure development between 20 and 450 °C were investigated for Magnesium AZ31 alloy. It was found that this alloy softens preferably by dynamic recrystallisation. This process starts at suitable deformation conditions above 150 °C. However, the temperature region above 250 °C is more interesting for the production process the semi‐finished products. The recrystallised grain size depends heavily on the deformation temperature. A grain size with a mean diameter smaller than 10 μm can be created below 300 °C. For further processing of Magnesium sheets, temperatures above 100 °C are suitable, but temperatures above 300 °C are responsible for superplasticity.