超音波照射によるアルミニウム合金におけるAl-Fe-Si系化合物の異質核生成促進

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タイトル別名
  • Acceleration of Heterogeneous Nucleation of Al-Fe-Si Compounds in Aluminum Alloy by Ultrasonic Radiation
  • チョウオンパ ショウシャ ニ ヨル アルミニウム ゴウキン ニ オケル Al-Fe-Siケイ カゴウブツ ノ イシツカク セイセイ ソクシン

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<p>  The purpose of this study is to refine Al-Fe-Si compounds in aluminum alloys by ultrasonic radiation at a temperature higher than the crystallization temperature of Al-Fe-Si compounds. The ultrasonic refining effect was examined using Al-Si-Fe-Mn alloys without or with the addition of chromium and titanium. The experiments included melting 1kg of alloys in a crucible, dipping an ultrasonic horn into the melt, radiating ultrasound into the melt for 30s at a temperature at least 50K higher than the crystallization temperature of Al-Fe-Si compound, holding the melt for 20s and casting it into a copper mold by gravity casting. The refining effect of Al-Fe-Si compounds was found to be improved by the addition of chromium and titanium. EPMA analysis was applied to elucidate the reason. The results revealed that the ultrasonic radiation accelerates the formation of Cr-containing compounds and Ti-containing compounds acting as heterogeneous nuclei of the Al-Fe-Si compounds. The analysis results suggested that the refined Al-Fe-Si compound is composed of the K5 phase. The heterogeneous nuclei of the K5 phase was presumed to be the Al-Cr-Si β phase and Al-Si-Ti τ1 phase, respectively.</p>

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  • 鋳造工学

    鋳造工学 88 (1), 3-10, 2016

    公益社団法人 日本鋳造工学会

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