Abstract
Tensile properties of commercial wrought AZ31B (Mg-3Al-0.9Zn-0.15Mn in wt.%) magnesium alloy sheets were investigated at various temperatures between room temperature and 400 °C at a strain rate of 4.5 x 10^-2 s^-1. The yield stress and the maximum stress decrease with increasing temperature. The strain to fracture is constant up to 100 °C and increases very rapidly above this temperature to reach approx. 100% at 400 °C. Yield point was observed at temperature range of 250-400 °C, which indicates the interaction of alloying elements with dislocations. The results are explained by the dislocation glide in the basal and non-basal slip systems. Possible softening mechanisms are discussed.

Key words
magnesium alloy, mechanical properties, tension test, high temperature deformation, dislocations

Full text (623 KB)