The gradient nano structure of Mg alloys

The future direction for expanding applications of Mg alloys is searching an ideal process and enhancing the comprehensive properties. Based on the function of plastic deformation, Mg alloys with gradient nano structure, combining the characteristic of nano grain and coarse grain, can overcome the low plasticity and toughness of nano structure and significantly improve the mechanical performance like strength, wear resistance and thermal stability. Thus, Mg alloys with gradient nano structure can enhance the integrated performance to the maximum extent. This paper reviews the domestic and foreign research status of Mg alloys with gradient nano structure in terms of preparation process, the mechanism of formation and the variation of properties. However, Mg alloys with gradient nano structure exhibited inferior corrosion resistance. The combination of coating and gradient nano structure will be the key point of future to improve the corrosion resistance. Aimed at expanding the industry application of Mg alloys with gradient nano structure, this paper also proposes several advices and underlines the importance of corrosion resistance and fatigue property, looking forward to providing more valuable information for the future.