【摘 要】
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The fatigue crack growth behavior of an AZ31 magnesium alloy was investigated by comparing the effect of zirconate and phosphate chemical liquids.The morphology
【机 构】
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Department of Materials Science and Engineering
【基金项目】
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This work was financially supported by the Natural Science Fund for Colleges and Universities in Jiangsu Province,China;the Foundation of Nanjing Institute of Technology;the Innovation Practice Traini
论文部分内容阅读
The fatigue crack growth behavior of an AZ31 magnesium alloy was investigated by comparing the effect of zirconate and phosphate chemical liquids.The morphology,components,and phase compositions of the chemical depositions at the fatigue crack tip were analyzed by employing scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),and X-ray diffraction(XRD),respectively.For samples with and without the chemical liquids,their stress-intensity factor values at the fatigue crack tip were compared by using a stress-strain gauge.The results demonstrated that a zirconate film(ZrxOy·ZnxOy)and a phosphate film(Zn3(PO4)2·4H2O and MgZnP2O7)could be formed on the fatigue crack-surface at the fatigue crack tip.The stress distribution was changed because of the chemical depositions and the causticity of the chemical liquids.This could decrease the stress-intensity factor value and thus effectively cause fatigue crack closure,which reduces the fatigue crack growth rate.Moreover,it was found that the fatigue crack closure effect of zirconates was more positive than that of phosphates.
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