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Journal of Materials Science
Published in: Journal of Materials Science 4/2020

20-09-2019 | Metals & corrosion

Enhanced mechanical properties and corrosion resistance of biodegradable Mg–Zn–Zr–Gd alloy by Y microalloying

Authors: Ya Liu, Jiuba Wen, Junguang He, Huan Li

Published in: Journal of Materials Science | Issue 4/2020

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Abstract

This study investigated the microstructure, mechanical properties, corrosion behavior of as-cast Mg–1.8Zn–0.4Zr–1.74Gd–xY (x = 0, 0.25, 0.5, 0.75, 1.0, 1.25 wt%) biodegradable magnesium alloys. Microstructures of the alloys were characterized by optical microscopy (OM), scanning electron microscopy (SEM) equipped with energy dispersion spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results showed that the alloys were mainly composed of α-Mg matrix (Mg, Zn)3(Gd, Y) phase, Mg3Zn3(Gd, Y)2 phase and Mg12Zn(Gd, Y) phase. It was found that 0–1.25 wt% Y addition led to significant grain refinement of the alloys from 111.5 to 57.3 μm. Moderate amount of Y resulted in improved strength. However, the strength and elongation decreased when the Y content exceeded 0.5 wt%. With 0.5 wt% of Y, the corrosion rate and corrosion current density were 0.721 ± 0.042 mm y−1 and 4.76 μA cm−2, respectively, which were lower than the other investigated alloys. Among all the tested samples, Mg–1.8Zn–0.4Zr–1.74Gd–0.5Y alloy has the moderate corrosion rate and mechanical properties, making it promising for the future optimization of the biodegradable Mg–Zn–Zr–Gd–Y alloys.
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Metadata
Title
Enhanced mechanical properties and corrosion resistance of biodegradable Mg–Zn–Zr–Gd alloy by Y microalloying
Authors
Ya Liu
Jiuba Wen
Junguang He
Huan Li
Publication date
20-09-2019
Publisher
Springer US
Published in
Journal of Materials Science / Issue 4/2020
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-019-04026-1

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