The correlation between the impression and double shear creep of AZ31 magnesium alloy

This study reports the application of an impression creep test to measure the creep behavior of AZ31 magnesium alloy. The correlation between the impression and double shear creep data on the same sample was determined. The creep parameters determined via impression and double shear creep assessments were found to be identical, with n = ∼3.5 and Q = ∼109.1 kJ/mol in the low-stress region, indicating that creep deformation was found to be controlled by the viscous glide of dislocations and that the viscous glide was governed by the diffusion of aluminum atoms in magnesium. The punching stress conversion factor α was determined to be 3.4 with a correlation factor β = 0.755. The Dorn constant A was determined to be 11.4 s−1. The ratio of As to Ai was 967.8, which is close to the predicted value of 928.6. This fact indicates that the impression creep relationship and double shear creep relationship can be converted into the equivalent uniaxial creep relationship.