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
|Author:||Yao, Huai1,2; Wen, Jiuba1,2; Xiong, Yi1,2;|
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
|Online Access:||PDF Full Text (PDF, 6.6 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2018092636677
Multidisciplinary Digital Publishing Institute,
|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.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
216 Materials engineering
114 Physical sciences
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.
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