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Materials 2017, 10(5), 477; doi:10.3390/ma10050477

Rare Earth Element Yttrium Modified Mg-Al-Zn Alloy: Microstructure, Degradation Properties and Hardness

1
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
2
Health Management Center, Xiangya Hospital, Central South University, Changsha 410008, China
3
School of Material Science and Engineering, Central South University, Changsha 410083, China
4
Human Reproduction Center, Shenzhen Hospital of Hongkong University, Shenzhen 518053, China
5
Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha 410008, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Javier Narciso
Received: 15 March 2017 / Revised: 12 April 2017 / Accepted: 26 April 2017 / Published: 28 April 2017
View Full-Text   |   Download PDF [4238 KB, uploaded 28 April 2017]   |  

Abstract

The overly-fast degradation rates of magnesium-based alloys in the biological environment have limited their applications as biodegradable bone implants. In this study, rare earth element yttrium (Y) was introduced into AZ61 magnesium alloy (Mg-6Al-1Zn wt %) to control the degradation rate by laser rapid melting. The results showed that the degradation rate of AZ61 magnesium alloy was slowed down by adding Y. This was attributed to the reduction of Mg17Al12 phase and the formation of Al2Y phase that has a more active potential, which decreased galvanic corrosion resulting from its coupling with the anodic matrix phase. Meanwhile, the hardness increased as Y contents increased due to the uniform distribution of the Al2Y and Mg17Al12 phases. However, as the Y contents increased further, the formation of excessive Al2Y phase resulted in the increasing of degradation rate and the decreasing of hardness due to its agglomeration. View Full-Text
Keywords: AZ61 magnesium alloy; microstructure; degradation properties; hardness AZ61 magnesium alloy; microstructure; degradation properties; hardness
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Liu, L.; Yuan, F.; Zhao, M.; Gao, C.; Feng, P.; Yang, Y.; Yang, S.; Shuai, C. Rare Earth Element Yttrium Modified Mg-Al-Zn Alloy: Microstructure, Degradation Properties and Hardness. Materials 2017, 10, 477.

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