A continuous net-like eutectic structure enhances the corrosion resistance of Mg alloys

¹ State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, People’s Republic of China

² Jiangxi University of Science and Technology, Ganzhou 341000, People’s Republic of China

³ Shenzhen Institute of Information Technology, Shenzhen 518172, People’s Republic of China

⁴ Department of Periodontics and Oral Mucosal Section, Xiangya Stomatological Hospital, Central South University, Changsha 410078, People’s Republic of China

IJB 2019, 5(2), 207 https://doi.org/10.18063/ijb.v5i2.207

Published: 1 July 2019

© 2019 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )

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Abstract

Mg alloys degrade rather rapidly in a physiological environment, although they have good biocompatibility and favorable mechanical properties. In this study, Ti was introduced into AZ61 alloy fabricated by selective laser melting, aiming to improve the corrosion resistance. Results indicated that Ti promoted the formation of Al-enriched eutectic α phase and reduced the formation of β-Mg17Al12 phase. With Ti content reaching to 0.5 wt.%, the Al-enriched eutectic α phase constructed a continuous net-like structure along the grain boundaries, which could act as a barrier to prevent the Mg matrix from corrosion progression. On the other hand, the Al-enriched eutectic α phase was less cathodic than β-Mg17Al12 phase in AZ61, thus alleviating the corrosion progress due to the decreased potential difference. As a consequence, the degradation rate dramatically decreased from 0.74 to 0.24 mg·cm-2·d-1. Meanwhile, the compressive strength and microhardness were increased by 59.4% and 15.6%, respectively. Moreover, the Ti-contained AZ61 alloy exhibited improved cytocompatibility. It was suggested that Ti-contained AZ61 alloy was a promising material for bone implants application.

Keywords

eutectic α phase; net-like structure; selective laser melting; mg alloys; corrosion resistance

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