Grain refinement of wrought AZ61 magnesium alloy

Deformation behaviors of AZ61 magnesium alloy during hot compression at temperature range from 523 K to 673 K and strain rate from 0.001s(-1) to 1 s(-1) were investigated. Dynamic recrystallization took place, and grains can be greatly refined through dynamic recrystallization. The mean size of the recrystallized grain decreased with the decrease of temperature or the increase of Z (Zener-Hollomon parameter), while the reciprocal of the recrystallized grain has a good linear relationship with the natural logarithm of Z value. The fine grain microstructure of extruded AZ61 magnesium alloy between 5-25 mu m were observed at the lower deformation temperature of the 523-623K range by means of the relationship between d and Z parameter.