Based on the major compositions of AZ81 magnesium alloy, new magnesium alloys were prepared by adding different contents of rare earths into AZ81 magnesium alloy. Mechanical properties and corrosion resistance of magnesium alloy in the simulated human body fluid were improved by heat treatment. The microstructures and morphologes of the prepared magnesium alloys were analyzed by methods of metallographic analysis, SEM, EDS, XRD, mechanical properties testing and electrochemical corrosion testing. Th...