Effect of P and Na on microstructures of hyper-eutectic Al-Si-Mg alloy.

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  • 過共晶Ａｌ‐Ｓｉ‐Ｍｇ合金のミクロ組織に及ぼすＰとＮａの影響
  • カキョウショウ Al Si Mg ゴウキン ノ ミクロ ソシキ ニ オヨボス

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Abstract

Modification of hypereutectic Al-Si-Mg alloys into which various combinations of P and Na had been added was studied at various casting temperatures and cooling rates. If Mg content is less than about 0.5% in Al-20%Si-0.015%P alloy, an increase in Na content results in crystallization of fine grained primary silicon crystals and fibrous eutectic silicon crystals. If Mg is more than about 1.3%, however, an increase in Na does not have such an effect. Simultanious addition of Na and P to AC9A containing about 1.5%Mg has little effect on improvement of mechanical properties.

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