Low cycle fatigue behavior under asymmetric loading of two AZ31B magnesium alloys with different microstructures and textures

Abstract

Abstract Low cycle fatigue experiments under asymmetric loading on differently prepared AZ31 alloys show that the alloy with fine grains exhibits higher stress amplitudes than those of the alloy with coarse grains at the same strain amplitudes. The elastic strain in the tensile process is higher than that in the compressive process for both alloys, but the difference is much smaller for the alloy with fine grains. The microstructure with fine grains exhibits a symmetrical hysteresis loop and cyclic strain softening at the early fatigue stage at low strain amplitude.