期刊
MATERIALS
卷 10, 期 5, 页码 -出版社
MDPI AG
DOI: 10.3390/ma10050477
关键词
AZ61 magnesium alloy; microstructure; degradation properties; hardness
类别
资金
- Natural Science Foundation of China [51575537, 81572577]
- Hunan Provincial Natural Science Foundation of China [14JJ1006, 2016JJ1027]
- Project of Innovation-driven Plan of Central South University [2015CXS008, 2016CX023]
- Open-End Fund for the Valuable and Precision Instruments of Central South University
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201605]
- State Key Laboratory for Powder Metallurgy
- Project of State Key Laboratory of High Performance Complex Manufacturing, Central South University
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.
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