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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.
Cyclic deformation and fatigue behaviors of Mg-12% Gd-3% Y-0.5% Zr (wt%, GW123K) alloy were investigated at room temperature under a cyclic cyclic loading in a controlled condition. 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 indicating that the fatigue cracks moderate 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.