Abstract
Three kinds of modified layers were prepared on the surface of ZK60 magnesium alloy (BM) by micro-arc oxidation (MAO), laser shock penning (LSP), and composite of LSP and MAO method. Four kinds of specimens (BM, MAO, LSP, LSP / MAO) were pre-corroded in a simulated body fluid (SBF) with pH7.4 for 12 h. Fatigue tests were performed for non-corroded and pre-corroded specimens under stress-controlled cyclic loading. The cyclic deformation behavior of the specimens at different stress ratios and different stress amplitudes involves four deformation mechanisms: dislocation slip, twinnig-detwinning transfer to dislocation slip, partial twinning-partial detwinning, complete twinning-complete detwinning. The correlation between the cyclic deformation mechanism and fatigue life is discussed using a proposed evaluation parameter, β. The fatigue life of the material decreases with the β values increasing when cyclic deformation is dominated by twinning-detwinning. The proposed total strain energy model can better predict the fatigue life of modified magnesium alloys under different loading conditions.
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