(1) Poor heat resistance is one of the main reasons hindering the wide application of magnesium alloys. When the temperature rises, its strength and creep resistance are greatly reduced, making it difficult to be widely used as key parts (such as engine parts) in industries such as automobiles. The alloying elements used in the development of heat-resistant magnesium alloys are mainly rare earth elements (RE), but the high cost of rare earth alloys has become a major obstacle to their application.
(2) Poor corrosion resistance. Because magnesium is relatively active, it is easily oxidized by air at room temperature to form an oxide film, which is porous and loose; it is easy to violently oxidize and burn in a liquid state, so magnesium alloys must be smelted under solvent coverage or in a protective atmosphere. The solution treatment of magnesium alloy castings should also be carried out under the protection of SO2, CO2 or SF6 gas, or under vacuum. Poor corrosion resistance seriously restricts the application of magnesium alloy materials.
(3) Poor flame retardancy. Magnesium alloys are prone to severe oxidative combustion during the melting and casting process. Although the existing flux protection method and gas protection method are effective flame retardant methods, they cause serious environmental pollution in application, reduce the performance of the alloy, and increase equipment investment. Therefore, it is necessary to develop flame-retardant magnesium alloys with good flame-retardant and mechanical properties.