Second phase effect on corrosion of nanostructured Mg-Zn-Ca dual-phase metallic glasses

Dual-phase metallic glasses (DP-MGs), a special member of the MGs family, often reveal unusual strength and ductility, yet, their corrosion behaviors are not understood. Here, we developed a nanostructured Mg57Zn36Ca7 (at.%) DP-MG and uncovered its corrosion mechanism in simulated body fluid (SBF) a...

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Bibliographic Details
Published in:Journal of magnesium and alloys 2021-09, Vol.9 (5), p.1546-1555
Main Authors: Liu, Chang, Wang, Qing, Han, Bin, Luan, Junhua, Kai, Ji-Jung, Liu, Chain-Tsuan, Wu, Ge, Lu, Jian
Format: Article
Language:English
Subjects:
APT
Corrosion
Magnesium alloys
Metallic glass
Sputtered films
TEM
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Summary:Dual-phase metallic glasses (DP-MGs), a special member of the MGs family, often reveal unusual strength and ductility, yet, their corrosion behaviors are not understood. Here, we developed a nanostructured Mg57Zn36Ca7 (at.%) DP-MG and uncovered its corrosion mechanism in simulated body fluid (SBF) at the near-atomic scale utilizing transmission electron microscope (TEM) and atom probe tomography (APT). The 10-nm-wide Ca-rich amorphous phases allow oxygen propagation into the DP-MG, resulting in a micrometer thick hydroxides/oxides layer. This dense corrosion layer protects the DP-MG from further corrosion, enabling a corrosion rate that is 77% lower than that of Mg (99.99% purity).
ISSN:2213-9567
2213-9567
DOI:10.1016/j.jma.2021.03.016