Microstructure and Corrosion Properties of Mg-Zn-Ca-Nd Alloy for Biomedical Application

Abstract:

The microstructure and corrosion properties of the as-cast Mg-Zn-Ca-Nd alloys were investigated in this study. The results showed that the alloy was mainly composed of α-Mg solid solution and the secondary phases of MgZn, Ca₂Mg₆Zn₃ and Mg₄₁Nd₅. The portion of precipitated phases was increased with the increment of Nd content. Both electrochemical measurement and immersion test indicated that Mg-4Zn-0.5Ca-1.0Nd had the best corrosion resistance in SBF solution. This is attributed to a combination of (1) the uniform microstructure of alloy, and (2) a lower volume fraction of second phases. In the Mg-4Zn-0.5Ca-3.0Nd alloy, the corrosion rate might slow down due to finer dendrite cells were surrounded by the more continuous second phases along the grain boundary and in the α-Mg matrix.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 756-759
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.756
• Online since: August 2013
• Authors: Dong Mei Jiang*, Zhan Yi Cao, Liang Guo, Xu Sun, Jin Ling Zhang
• Keywords: Corrosion Properties, Mg-Zn-Ca-Nd Alloy, Microstructure, Neodymium (Nd)

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