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A study of the internal strain (stress) evolution during uni-axial cyclic deformation along the prior extrusion axis with fully reversed total constant strain amplitudes ε A  (0.5% &lt; ε A  &lt; 5%) was investigated by using in-situ high energy synchrotron X-ray diffraction. The deformation is dominated by {10 1 2} 〈10 1 1〉 twinning and detwinning mechanisms within the textured hot extruded magnesium alloy AZ31. The results show a strong load partitioning between the internal stresses of (10 1 0) and (11 2 0) parent grains and of the (0002) twinned daughter grains that are relaxed. Following the evolution of the twinning/detwinning behavior and the hkil dependent microstresses as a function of cycling numbers, two different regimes were observed whereby it was found that the transition between these regimes is marked by an applied strain amplitude of eA = 0.625%.

Microstructural development of the hot extruded magnesium alloy AZ31 under cyclic testing conditions