Effect of SiC on mechanical properties and corrosion behavior of Mg-Y-Zn alloy
| Autor: | Hsu-Chieh Liu, 劉旭杰 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 In this study, Mg-based metal matrix composites (MMC) were prepared by two-step casting of Mg97Y2Zn1 alloy with 5 and 10wt% of SiC particles. Microstructure, mechanical properties, and corrosion behavior of the prepared samples were investigated. The composites contain α-Mg, Mg12YZn (LPSO) and SiC phase. By adding SiC particles, the MgYZn alloy’s hardness was increased; for tension test, yield strength and ultimate strength of MgYZn alloy were 46 MPa and 170 MPa, respectively. By adding 5 wt% of SiC particles, yield strength and ultimate strength were 97 MPa and 223 MPa; as for adding 10 wt% of SiC particles, yielding strength and ultimate strength were 91 MPa and 238 MPa. Mechanical strength was also enhanced after adding SiC particles. By estimating the amount of SiC, the actual amount of SiC in the two MMC was not very different, which is around 3.5 wt%. It was speculated that the limit of SiC which could be added into the Mg alloy by two-step casting has been reached. The results obtained from immersion tests showed that the corrosion of MgYZn alloy with 5 or 10 wt% of SiC were more severe than that of MgYZn alloy. Pitting corrosion between SiC particles and Mg matrix led to decline corrosion resistance. The corrosion rate of Mg-based metal matrix composites is higher than Mg97Y2Zn1 alloy. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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