Effect of high pressure on microstructure of cast Mg-8Zn-0.5Zr-0.5Gd alloy |
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| Authors: | Yin Dong-song Zhang Yun-long An Yong-liang Wang Zhen-ling Hu Yun-zhou Liu Ai-lian |
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| Affiliation: | 1. College of Materials Science and Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;College of Materials Science & Engineering, Jiamusi University, Jiamusi 154007, China |
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| Abstract: | 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 μm to 100-200 μm and the secondary dendrite arm spacing reduced from 30-50 μm to 10-30 μm. 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. |
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| Keywords: | magnesium alloy high pressure solidification microstructure corrosion rate micro-hardness |
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