Effect of high pressure on microstructure of cast Mg-8Zn-0.5Zr-0.5Gd alloy

Mg-8Zn-0.5Zr-0.5Gd alloy was prepared by high pressure solidification. Effect of high pressure on microstructure, micro-hardness and corrosion behavior in Hank＇s solution of the Mg-8Zn-0.5Zr-0.5Gd alloy were investigated by means of optical microscopy （OM）, scanning electron microscopy （SEM）, energy...

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Bibliographic Details
Published in:China foundry 2017, Vol.14 (1), p.22-27
Main Authors: Yin, Dong-song, Zhang, Yun-long, An, Yong-liang, Wang, Zhen-ling, Hu, Yun-zhou, Liu, Ai-lian
Format: Article
Language:English
Subjects:
Alloys
Comparative analysis
Corrosion (Chemistry)
Electron microscopy
Engineering
Machines
magnesium alloy
high pressure solidification
microstructure
corrosion rate
micro-hardness
Magnesium alloys
Manufacturing
Materials Engineering
Mechanical properties
Metallic Materials
Microscopy
Processes
Research & Development
Specialty metals industry
Spectroscopy
Zinc compounds
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Summary:Mg-8Zn-0.5Zr-0.5Gd alloy was prepared by high pressure solidification. Effect of high pressure on microstructure, micro-hardness and corrosion behavior in Hank＇s solution of the Mg-8Zn-0.5Zr-0.5Gd alloy were investigated by means of optical microscopy （OM）, scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, and X-ray diffractometer （XRD）. The results showed that, compared with the conventional solidification, high pressure solidification obviously refined the grain size of Mg-8Zn-0.5Zr-0.5Gd alloy. The grain size was refined from 200-300 pm to 100-200 pm and the secondary dendrite arm spacing reduced from 30- 50 pm to 10-30 pro. Moreover, the solubility of Zn in the alloy increased and the amount and size of Mg-Zn-Gd phases significantly decreased. The micro-hardness of the alloy solidified under high pressure was improved significantly from 56.17 HV to 63.14 HV. The polarization resistance （Rp） of the alloy had a substantial increase in simulated body fluid, thus the corrosion rate was significantly reduced from 4.0 to 2.7 mm.year-1.
ISSN:1672-6421
2365-9459
1672-6421
DOI:10.1007/s41230-017-5018-5