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Strain-controlled fatigue of Mg-1Mn-0.5Nd (wt.\%) alloy were studied byexperiment and simulation. The microstructure was made up of a dispersion ofstrongly texture grains (13\%) embedded in a matrix of grains with a randomtexture. The cyclic stress-strain curves showed limited tension-compressionanisotropy because of the limited texture. Cyclic hardening under compressionand cyclic softening under tension occurred due to the presence of twinning.Moreover, the twin volume fraction of the broken samples depended on whetherthe sample was broken in tension or compression, indicating thattwining-detwinning occurs during the whole fatigue life. The mechanicalresponse of the polycrystalline alloy was simulated by means of computationalhomogenization. The behavior of the Mg grains was modelled using aphenomenological crystal plasticity model that accounted for basal, prismaticand pyramidal slip (including isotropic and kinematic hardening) as well astwining and detwinning. The model parameters were calibrated from the cyclicstress-strain curves at different cyclic strain amplitudes. Numericalsimulations were used to understand the dominant deformation mechanisms and topredict the fatigue life by means of a fatigue indicator parameter based on theaccumulated plastic shear strain in each fatigue cycle.

Experimental and numerical analysis of cyclic deformation and fatigue behavior of a Mg-RE alloy