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

Chang Liu; Qing Wang; Bin Han; Junhua Luan; Ji-Jung Kai; Chain-Tsuan Liu; Ge Wu; Jian Lu

Journal of Magnesium and Alloys (Sep 2021)

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

Chang Liu,
Qing Wang,
Bin Han,
Junhua Luan,
Ji-Jung Kai,
Chain-Tsuan Liu,
Ge Wu,
Jian Lu

Affiliations

Chang Liu: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, Düsseldorf, 40237, Germany
Qing Wang: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Laboratory for Microstructures, Institute of Materials Science, Shanghai University, Shanghai 200072, China
Bin Han: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
Junhua Luan: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
Ji-Jung Kai: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
Chain-Tsuan Liu: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
Ge Wu: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, Düsseldorf, 40237, Germany; Corresponding authors.
Jian Lu: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Hong Kong Branch of National Precious Metals Material Engineering Research Centre, Department of Material Science and Engineering, City University of Hong Kong, Hong Kong, China; Centre for Advanced Structural Materials, City University of Hong Kong Shenzhen Research Institute, Greater Bay Joint Division, Shenyang National Laboratory for Materials Science, Shenzhen 518057, China; CityU-Shenzhen Futian Research Institute, Shenzhen 518045, China; Corresponding authors.

Journal volume & issue: Vol. 9, no. 5
pp. 1546 – 1555

Abstract

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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).

Published in Journal of Magnesium and Alloys

ISSN: 2213-9567 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/journal-of-magnesium-and-alloys/

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