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Effect of Phase Transformation During Long-Term Solution Treatment on Microstructure,Mechanical Properties,and Bio-corrosion Behavior of Mg–5Zn–1.5Y Cast Alloy

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Acta Metallurgica Sinica(English Letters) 2018年第6期31卷 561-574页

作者： H.Jafari E.Heidari a.barabi M.Dashti Kheirabadi Materials Engineering Department Faculty of Materials Engineering and Modern TechnologiesShahid Rajaee Teacher Training University

The influence of long-term solution treatment for various intervals on the microstructure,mechanical properties,and corrosion resistance of the as-cast Mg–5Zn–1.5Y alloy was *** of secondary phases was studied during solution treatment through thermal analysis test and thermodynamic *** and hardness tests,as well as polarization and immersion tests,were performed to evaluate the mechanical properties and corrosion behavior of the ascast and heat-treated alloy,*** show that solution treatment transforms I-phaseinto W-phaseas well as dissolves it into the a-Mg matrix to some extent;therefore,the amount of W-phase ***,prolonged solution treatment decreases the volume fraction of the *** the first stage of solution treatment for 14 h,the tensile properties significantly increase due to the incomplete phase *** long-term solution treatment sharply decreases the tensile and hardness properties of the alloy,it improves the corrosion resistance due to the transformation of I-phase into *** fact,it decreases corrosion potential and simultaneously dissolves intermetallic compounds into the a-Mg matrix,resulting in the reduction in galvanic microcells between the matrix and *** is found that the optimum time for long-term solution treatment is 14 h,which improves both corrosion behavior and mechanical properties.

关键词： Magnesium alloy Long-term solution treatment Microstructure Mechanical properties Bio-corrosion

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