Degradable Mg alloy composites using fly ash cenospheres
| Autor: | Yin Xiao-li, Ji Zhikang, Yu Sirong |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Alloy 02 engineering and technology mechanical properties engineering.material 021001 nanoscience & nanotechnology corrosion behavior 01 natural sciences degradable composites fly ash cenospheres Cenosphere Fly ash 0103 physical sciences TA401-492 Materials Chemistry Ceramics and Composites engineering Composite material 0210 nano-technology Corrosion behavior Materials of engineering and construction. Mechanics of materials |
| Zdroj: | Science and Engineering of Composite Materials, Vol 25, Iss 6, Pp 1115-1122 (2018) |
| ISSN: | 2191-0359 0792-1233 |
| DOI: | 10.1515/secm-2017-0243 |
| Popis: | The feasibility of fabricating Mg alloy degradable composites with fly ash cenospheres (FACs) using stir casting has been demonstrated. The effects of FAC addition (mass fraction: 0, 2, 4, 6, 8 and 10 wt.%) on the microstructure, mechanical properties and corrosion behavior were investigated using optical microscope, scanning electron microscope, X-ray diffraction, density tests, compression tests, immersion tests and electrochemical measurements. The result shows that the degradable composites are mainly composed of α-Mg, β-Mg17Al12, Mg2Si and MgO phase, and FAC can refine the grain size. The average measured densities of the FAC/Mg alloy composites are higher than the theoretical values due to the formation of the Mg2Si phase, which are in the range of 1.8843–2.0526 g/cm3. The compressive strength of the degradable composites dramatically enhances with the addition of FAC, and the maximum strength is 375 MPa with the 8-wt.% mass fraction, which can be attributed to the refined grains and the formation of massive Mg2Si phase. Furthermore, the corrosion rate of the degradable composites with 10 wt.% FACs shows the highest value of 5.02 g/h in 3 wt.% potassium chloride solution at 80°C, which is three times higher than the corrosion rate of composites without FAC. With the increase in FAC content, more Mg2Si phases formed; thus, micro-galvanic corrosion works well in the composites. |
| Databáze: | OpenAIRE |
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