The tensile and compression fatigue deformation tests of AZ31 magnesium alloy were carried out at room temperature, the activation behavior {10-12}-{10-12} secondary twins in different loading directions (ND normal direction, RD rolling direction) strain amplitude (0.5%, 1%) was studied. results showed that observed on fracture surface samples ND 1%. In contrast, no 0.5% nor 1% 0.5%, life great...