Fabrication of Al Alloy Foams and Evolution Mechanism of Hydrogen Bubbles

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  • Kadoi Kota
    Graduate School of Sci. and Eng., Waseda University
  • Nakae Hideo
    Lab. for Mater. Sci. and Tech., Waseda University

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  • 発泡アルミニウム合金の製造と水素気泡の成長機構
  • ハッポウ アルミニウム ゴウキン ノ セイゾウ ト スイソ キホウ ノ セイチョウ キコウ

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Abstract

  The significant features of closed cell aluminum foams are low density, high specific strength, high energy absorption, etc. These advantages are affected by the size, shape, and uniformity of cells in the foam. In order to improve the cellular structure of metal foams, foam stability of liquid metals to prevent rapture and drainage events has to be understood and controlled. A clear understanding of factors is therefore expected to improve quality and process control more easily. <br>  In this study, the influence of the temperature for adding foaming agent viscosity of the melt on foamability, and the growing mechanism of hydrogen bubbles in aluminum melt were investigated. Aluminum alloy foams were fabricated using the powder decomposition in the melt process and the unidirectional solidification method. As starting materials, Al-25mass%Cu-5mass%Si and Al-12.6mass%Si alloys were used. It was found that the temperature of foaming agent addition affected the number of cells and cell wall thickness. This effect was greater than those of viscosity and alloy components. Namely, the drainage of the liquid in foam film is the main factor for fabricating fine aluminum foam effectively.

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