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      저자 : Armin Siahsarani (검색결과 1 건)
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        Microstructural, Mechanical and Corrosion Properties of AZ91 Magnesium Alloy Processed by a Severe Plastic Deformation Method of Hydrostatic Cyclic Expansion Extrusion

        Armin Siahsarani,Farshad Samadpour,Mohammad Hossein Mortazavi,Ghader Faraji 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8

        This research investigates the microstructural evolution, mechanical properties, and corrosion behavior of AZ91 magnesiumalloy after the process of hydrostatic cyclic expansion extrusion (HCEE) at elevated temperature. The HCEE process is ableto produce long length ultrafine-grained rods by applying high hydrostatic pressure. The results showed that ultrafine-grainedmicrostructure appears after the consecutive passes of the process, which led to the higher hardness and strength with anincreased elongation to failure in the processed rods at room temperature. The ultimate tensile strength and elongation tofailure of the processed rod after two cycles of the HCEE increased more than 2 and 2.6 times, respectively. Moreover, anincrease in hardness was more than 100% after the second cycle of the process and its distribution was more uniform. Furthermore,the ultrafine-grained microstructure after the HCEE resulted in the movement of potentiodynamic polarizationderived curves to higher values of corrosion potential (Ecorr) and lower current density (Icorr), which shows the capabilityof the HCEE process in improving the corrosion resistance of AZ91 magnesium alloy rods. These increases in corrosionresistance were further indicated by the Nyquist diagram derived from the electrochemical impedance spectroscopy scanningand evolved hydrogen amount after 208 h of immersion in 3.5% NaCl solution. The novel HCEE process shows furtherits capability in producing long length ultrafine-grained rods with superior mechanical and corrosion properties rather thanother severe plastic deformation techniques.

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