Manufacture of Foamed Aluminum Using Recycled ADC6, ADC12, AC2A Ingots

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  • 二次地金を用いたADC6，ADC12，AC2A合金発泡アルミニウムの製造
  • ニジ ジガネ オ モチイタ ADC6 ADC12 AC2A ゴウキン ハッポウ

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Abstract

  The foamability of recycled alloys such as ADC6 (Al-0.27Si-3.11Mg), AC2A (Al-5.51Si-3.94Cu) and ADC12 (Al-11.2Si-1.8Cu) were investigated by a gas foaming process. The high Mg-content alloy (ADC6) took a considerably short time for viscosity to rise due to accelerated oxdiation of the melt. In addition, the AC2A alloy with a larger mushy zone (i. e. , larger liquidus-solidus difference) required a long time to promote the growth of the foam in the liquid-solid region. The high Fe-content alloy such as ADC12 alloy, easily forms solidification cracks due to the formation of Al-Fe-Si intermetallic compound. This problem was solved by controlling the solidification rate of the foaming process.

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