1Key Laboratory of Near Net Forming of Jiangxi Province, Nanchang University, Nanchang 330031, PR China 2Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong, PR China 3Centre for Advanced Structural Materials, City University of Hong Kong, Shenzhen Research Institute, Shenzhen 518057, PR China
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DOI:
10.7502/j.issn.1674-3962.2016.11.03
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Abstract:
In order to expand the further using of Mg alloys, the future direction will focus on searching an ideal process and enhancing the comprehensive properties. Based on the function of plastic deformation, Mg alloys with the gradient nano structure, combined 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 maximum extent. This paper reviews the investigation situation of domestic and foreign 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 expand the industry application of Mg alloys with gradient nano structure, this paper also proposes the importance of fatigue tests and advices of improvement, looking forward to provide more valuable information for future work.