Effects of Si content and Ca modification on microstructure and thermal expansion property of Mg–Si alloys
| Autor: | Shusen Wu, Shulin Lü, Tian Guo, Lanqing Xia, Xiong Zhou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Morphology (linguistics)
Materials science Alloy 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Thermal expansion 0104 chemical sciences engineering General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Materials Chemistry and Physics. 253:123260 |
| ISSN: | 0254-0584 |
| Popis: | The effect of Si content on the coefficient of thermal expansion (CTE) of Mg-xSi (x = 1, 2, 3, 4 wt%) alloys and the influence of Ca addition of Mg–4Si-yCa (y = 0.2, 0.4, 0.6, 0.8, 1.0 wt%) alloys have been studied. The results show that with the increase of Si content, the CTE of Mg–Si alloys decrease sharply, which is decreased by 30.8%, from 26 × 10−6/K of pure Mg to 17.98 × 10−6/K of Mg–4Si alloy at room temperature. When appropriate amount of Ca is added, the morphology of Mg2Si in Mg–4Si alloy can be effectively modified, but excessive addition of Ca about 1 wt% can result in over-modification. When 0.2 wt% Ca is added, the CTE of Mg–4Si alloy is increased compared with no Ca addition. After this, along with the increase of Ca content, the CTE of the alloy is decreased. |
| Databáze: | OpenAIRE |
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