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

VIEWS - 37 (Abstract) 36 (PDF)
Cijun Shuai, Wenjing Yang, Youwen Yang, Chengde Gao, Chongxian He, Hao Pan

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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DOI: http://dx.doi.org/10.18063/ijb.v5i2.207

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