Mechanism for corrosion protection of β-TCP reinforced ZK60 via laser rapid solidification

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Youwen Deng, Youwen Yang, Chengde Gao, Pei Feng, Wang Guo, Chongxian He, Jian Chen, Cijun Shuai


It remains the primary issue to enhance the corrosion resistance of Mg alloys for their clinical applications. In this study, β-tricalcium phosphate (β-TCP) was composited with Mg-6Zn-1Zr (ZK60) using laser rapid solidification to improve the degradation behavior. Results revealed rapid solidification effectively restrained the aggregation of β-TCP, which thus homogenously distributed along grain boundaries of α-Mg. Significantly, the uniformly distributed β-TCP in the matrix promoted the formation of apatite layer on the surface, which contributed to the formation of a compact corrosion product layer, hence retarding the further degradation. Furthermore, ZK60/8β-TCP (wt. %) composite showed improved mechanical strength, as well as improved cytocompatibility. It was suggested that laser rapidly solidified ZK60/8β-TCP composite might be a potential materials for tissue engineering.


laser rapid solidification; ZK60/β-TCP composite; degradation behavior; microstructure

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