Spherodizing of primary silicon crystals in a hypereutectic Al-20%Si alloy by addition of metallic sodium
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It has been known that sodium addition modifies the structure of primary silicon crystals in hypereutectic Al-Si alloys. The present work was carried out to study effects of heating temperature, heating time, amount of sodium addition and cooling condition on spherodization of primary silicon crystals in a hypereutectic Al-20% Si alloy by sodium addition. The results obtained are as follows:When 1% sodium was added to a melt, which was heated at low temperature, spherodization of the primary silicon crystals was observed even after a melt was heated for a long time. The addition of more than 0.2% sodium to a melt, heated at 750°C for 5min, resulted in the modification of the primary silicon crystals. The cooling condition influenced the spherodization of the primary silicon crystals when an Al-Si alloy was heated at 750°C for 5min and treated with 0.5% sodium. An X-ray microanalysis showed that the spheroidal primary silicon crystals contained both components, Al and Na.
- 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
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