To develop a biomedical magnesium alloy with desirable mechanical properties and corrosion resistance, Mg–6Zn–8.16Y–2.02Mn and Mg–6Zn–8.16Y–2.02Mn–0.3Mo alloy were prepared. Then the alloys were solution-treated at 500°C for 40 h and cooled in the furnace. The results showed that partly 18R-long-period stacking ordered (LPSO) phase transformed to 14H-LPSO phase during solid-solution treatment. The hollowed-out W phase vanished and spherical W phase was formed. And the volume fraction of 18R-LPSO and the average size of the spherical W phase particles were reduced. Corrosion behaviour of the alloy in Hank's solution under each condition was studied by immersion test and electrochemical test. The solution-treated Mg–6Zn–8.16Y–2.02Mn–0.3Mo alloy exhibited the best mechanical property (ultimate tensile strength, UTS 270 MPa and elongation, EL 23%) and corrosion resistance (PW 1.03 mm/year and Icorr 0.20 mm/year) due to fine and homogeneous microstructure.
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