Microstructure and strengthening mechanism of Mg—5.88Zn—0.53Cu—0.16Zr alloy solidified under high pressure
| Autor: | Chong Zhang, Kun-yu Guo, Chang Xu, Duo Huang, Jie Ye, Xiao-ping Lin |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Atmospheric pressure Alloy Metals and Alloys 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Microstructure 01 natural sciences Dendrite (crystal) Solid solution strengthening Phase (matter) 0103 physical sciences Materials Chemistry engineering Composite material 0210 nano-technology Strengthening mechanisms of materials Eutectic system |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 30:99-109 |
| ISSN: | 1003-6326 |
| Popis: | Mg—5.88Zn—0.53Cu—0.16Zr (wt.%) alloy was solidified at 2—6 GPa using high-pressure solidification technology. The microstructure, strengthening mechanism and compressive properties at room temperature were studied using SEM and XRD. The results showed that the microstructure was refined and the secondary dendrite spacing changed from 35 μm at atmospheric pressure to 10 μm at 6 GPa gradually. Also, Mg(Zn,Cu)2 and MgZnCu eutectic phases were distributed in the shape of network, while under high pressures the second phases (Mg(Zn,Cu)2 and Mg7Zn3) were mainly granular or strip-like. The solid solubility of Zn and Cu in the matrix built up over increasing solidification pressure and reached 4.12% and 0.32% respectively at 6 GPa. The hardness value was HV 90 and the maximum compression resistance was 430 MPa. Therefore, the grain refinement strengthening, the second phase strengthening and the solid solution strengthening are the principal strengthening mechanisms. |
| Databáze: | OpenAIRE |
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