**3. Conclusion**

The attractive properties of Mg alloys include light weight, high specific strength, excellent castability and machinability …. However, these alloys have limited formability, limiting their industrial application. Strengthening of Mg alloys via the introduction of solid solution atoms and grain refinement additives are effective approaches. Much progress has been achieved in the development of high strength Mg alloys through solid solution strengthening using various types of solute atoms. Researchers incorporated various alloying elements such as Al, Zn, Ca, Mn and RE elements in Mg matrix. The chemical composition of Mg alloys affects the microstructure and then improves the mechanical properties and corrosion resistance.

The most commercial are the casting magnesium alloys such as AZ91, AM60 and WE43 due to their low cost. Meanwhile, the Mg alloy systems containing rare-earth and noble metal elements for solid solution strengthening result high costs. The heat treatment and the grain refinement via severe plastic deformation methods represent new approach to further strengthening of Mg alloys.
