Cyclic deformation and anelastic behavior of ZEK100 magnesium alloy: Effect of strain ratio

摘要: Abstract Wrought magnesium alloys with low rare-earth (RE) contents are being considered for lightweight automotive applications. The purpose of this study was to identify the effect strain ratio on cyclic deformation behavior a rolled ZEK100-O Mg alloy 0.2 wt% neodymium. microstructure in its annealing condition consisted equiaxed grains which were oriented most c-axes perpendicular rolling direction. This exhibited superior combination tensile strength and ductility due weak basal texture decreased stacking fault energy. Significant plastic occurred phase first cycle at ratios Re=0 0.5. asymmetry initial hysteresis loops tended diminish towards mid-life cycles. With increasing ratio, fatigue life increased, reached maximum Re=−1, then decreased. attributed combined stress amplitude, amplitude mean stress, where increased ratio. closer Re=−1 was, lower absolute value was. relaxation mainly stage more remotely from Re=−1. anelastic largely remained arising twinning detwinning, identified as an influential parameter via sensitivity analyses. along three newly-defined parameters (eccentricity, angle deviation, relative slope change) all reflecting symmetric loops.