University of Oulu

Yao, H., Wen, J., Xiong, Y., Liu, Y., Lu, Y., Cao, W. (2018) Microstructures, Mechanical Properties, and Corrosion Behavior of As-Cast Mg–2.0Zn–0.5Zr–xGd (wt %) Biodegradable Alloys. Materials, 11 (9), 1564. doi:10.3390/ma11091564

Microstructures, mechanical properties, and corrosion behavior of as-cast Mg–2.0Zn–0.5Zr–xGd (wt %) biodegradable alloys

Saved in:
Author: Yao, Huai1,2; Wen, Jiuba1,2; Xiong, Yi1,2;
Organizations: 1School of Materials Science and Engineering, Henan University of Science and Technology
2Collaborative Innovation Center of Nonferrous Metals, Luoyang, China
3Nano and Molecular Systems Research Unit, University of Oulu
4School of Mechanical and Automotive Engineering, Anhui Polytechnic University
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 6.6 MB)
Persistent link:
Language: English
Published: Multidisciplinary Digital Publishing Institute, 2018
Publish Date: 2018-09-26


The Mg–Zn–Zr–Gd alloys belong to a group of biometallic alloys suitable for bone substitution. While biocompatibility arises from the harmlessness of the metals, the biocorrosion behavior and its origins remain elusive. Here, aiming for the tailored biodegradability, we prepared the Mg–2.0Zn–0.5Zr–xGd (wt %) alloys with different Gd percentages (x = 0, 1, 2, 3, 4, 5), and studied their microstructures and biocorrosion behavior. Results showed that adding a moderate amount of Gd into Mg–2.0Zn–0.5Zr alloys will refine and homogenize α-Mg grains, change the morphology and distribution of (Mg, Zn)₃Gd, and lead to enhancement of mechanical properties and anticorrosive performance. At the optimized content of 3.0%, the fishbone-shaped network, ellipsoidal, and rod-like (Mg, Zn)3Gd phase turns up, along with the 14H-type long period stacking ordered (14H-LPSO) structures decorated with nanoscale rod-like (Mg, Zn)₃Gd phases. The 14H-LPSO structure only exists when x ≥ 3.0, and its content increases with the Gd content. The Mg–2.0Zn–0.5Zr–3.0Gd alloy possesses a better ultimate tensile strength of 204 ± 3 MPa, yield strength of 155 ± 3 MPa, and elongation of 10.6 ± 0.6%. Corrosion tests verified that the Mg–2.0Zn–0.5Zr–3.0Gd alloy possesses the best corrosion resistance and uniform corrosion mode. The microstructure impacts on the corrosion resistance were also studied.

see all

Series: Materials
ISSN: 1996-1944
ISSN-E: 1996-1944
ISSN-L: 1996-1944
Volume: 11
Issue: 9
Article number: 1564
DOI: 10.3390/ma11091564
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
114 Physical sciences
Funding: This work was supported by the Henan new nonferrous metal materials University Science and technology innovation team support program of china (2012IRTSTHN008), the Program for Science, Technology Innovation Talents in Universities of the Henan Province (17HASTIT026), the Science and Technology Project of the Henan Province (152102210077), the Education Department of Henan Province (16A430005) and the Science and Technology Innovation Team of Henan University of Science and Technology(2015XTD006). W. Cao acknowledge financial supports from profile grant of the Academy of Finland, Strategic Grant of Oulu University, and the Special-termed financial supports from Anhui Polytechnic University.
Copyright information: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (