Cyclic deformation and fatigue behaviors of Mg-12%Gd-3%Y-0.5%Zr(wt%,GW123K) alloy were investigated at room temperature under axial cyclic loading in strain controlled condition.It is shown that conventional extruded GW123K alloy maintained cyclic stability at strain amplitudes ranging from 2×10^(-3) to 10^(-2).The pronounced symmetric hysteresis loops were also observed during cyclic loading.Fracture surface observations indicated that fatigue cracks mainly initiated at large Gd-riched phase or at inclusion clusters at surface or subsurface,and grain boundary(GB) and slip bands(SBs) are also preferential sites for micro-crack incubation.
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