The influence of preheating temperature on the mechanical properties of AZ31 magnesium alloys after hot-rolling

Sheets of magnesium alloys are prospective materials for the mass reduction in car manufacturing. Sheets of the wrought magnesium alloy AZ31 were produced using a hot-rolling mill. Mechanical properties of these sheets were investigated for various preheating temperatures of as-received extruded and cast materials. The optimum preheating temperature resulting in superior mechanical properties was identified. Transmission electron microscopy indicated the occurrence of discontinuous dynamic recrystallization during hot rolling of preheated material. The extruded alloy exhibited better mechanical properties and lower porosity than the cast alloy.