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タイトル別名
  • Substructures of Columnar Grains in Ingots
  • チュウカイ ニ オケル チュウジョウショウ ノ サブ ソシキ ニ ツイテ

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説明

The present work was carried out so as to investigate the substructures of columnar grains in Al-Cu alloy ingots in connection with the growth conditions.<BR>The change of substructures of columnar grains was observed in aluminium ingots under a high pressure applied during solidification. Further experiments were performed on Al-0.2, 1 and 2%Cu alloys, and it was found that columnar grains grown under a high pressure, 2,072 kg/cm2, exhibited a simpler morphology than those grown under the atmospheric pressure. And in Al-0.2%Cu ingots solidified under the atmospheric pressure, the columnar grains grew in a cellular dendritic manner in the ingot cast in the mold at 15°C, and in a dendritic manner in the mold at 500°C.<BR>The above-mentioned change and difference in the substructures of columnar grains are hardly explainable in terms of growth parameter, G⁄V, where G is the temperature gradient in the liquid phase ahead of the freezing front and V is the growth rate of dendrite tips. However, taking G for the temperature gradient behind the freezing front, the dependence of growth morphology of columnar grains on G⁄V is consistent with the previously confirmed results.

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  • 日本金属学会誌

    日本金属学会誌 34 (8), 797-801, 1970

    公益社団法人 日本金属学会

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