微量のりんを含有する高純度Ａｌ‐Ｓｉ共晶合金の組織
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概要
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The effect of phosphorus on the silicon particle structure during solidification has been investigated for Al–Si eutectic alloy. Phosphorus content less than about 5 ppm refines the microstructure. The eutectic silicon exhibits a very finely divided lamellar structure. A few dendrites of primary aluminum crystal are also observed showing a slightly hypoeutectic behavior for this composition. For phosphorus content not less than 10 ppm, the coarsening of eutectic structure was observed. Then coarse crystals of plate-like silicon appear and the eutectic silicon of acicular shape becomes much coarser than that in the case of the pure alloy. Al–12.5%Si alloy containing phosphorus forms small crystals of aluminum phosphide in the molten aluminum before solidification, which act as effective nuclei for silicon and promote crystallisation of plate-like silicon at the start of solidification. The fact that undercooling of eutectic solidification becomes smaller for phosphorus containing alloy supports the above idea.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
- Mechanical and wear properties of SiC whisker/ADC12 aluminum alloy composites fabricated by die casting.
- Joining of aluminum and ceramics.
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- Undercooling and solidification behavior of fluid clumps of second-poured melt of hypereutectic Al-Si alloy in Duplex Casting process.
- Change in apparent viscosity of stirred slurry during production of semi-solid hypereutectic Al-Si alloy by slurry-melt mixing process.