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Metals 2017, 7(3), 105; doi:10.3390/met7030105

Microstructure Evolution and Biodegradation Behavior of Laser Rapid Solidified Mg–Al–Zn Alloy

1
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
2
Department of Oncology, Third Xiangya Hospital of Central South University, Changsha 410013, China
3
College of Chemistry, Xiangtan University, Xiangtan 411105, China
4
School of Material Science and Engineering, Central South University, Changsha 410083, China
5
Human Reproduction Center, Shenzhen Hospital of Hongkong University, Shenzhen 518053, China
6
Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha 410008, China
7
State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Received: 2 February 2017 / Revised: 3 March 2017 / Accepted: 20 March 2017 / Published: 22 March 2017
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Abstract

The too fast degradation of magnesium (Mg) alloys is a major impediment hindering their orthopedic application, despite their superior mechanical properties and favorable biocompatibility. In this study, the degradation resistance of AZ61 (Al 6 wt. %, Zn 1 wt. %, remaining Mg) was enhanced by rapid solidification via selective laser melting (SLM). The results indicated that an increase of the laser power was beneficial for enhancing degradation resistance and microhardness due to the increase of relative density and formation of uniformed equiaxed grains. However, too high a laser power led to the increase of mass loss and decrease of microhardness due to coarsened equiaxed grains and a reduced solid solution of Al in the Mg matrix. In addition, immersion tests showed that the apatite increased with the increase of immersion time, which indicated that SLMed AZ61 possessed good bioactivity. View Full-Text
Keywords: AZ61; selective laser melting; microstructure; biodegradation behavior AZ61; selective laser melting; microstructure; biodegradation behavior
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He, C.; Bin, S.; Wu, P.; Gao, C.; Feng, P.; Yang, Y.; Liu, L.; Zhou, Y.; Zhao, M.; Yang, S.; Shuai, C. Microstructure Evolution and Biodegradation Behavior of Laser Rapid Solidified Mg–Al–Zn Alloy. Metals 2017, 7, 105.

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