Al-Cu-Fe二十面体准晶的深过冷研究

通过循环过热净化法研究了Ａｌ－Ｃｕ－Ｆｅ合金系中Al₆₅Cu₂₀Fe₁₅合金液的深过冷采用循环过热净化法净化Al₆₅Cu₂₀Fe₁₅合金液，获得了９８Ｋ的过冷度，并制备出直径为６ｍｍ的高纯度的Ａｌ－ＣＳ－ＦＳ二十面体准晶球．随着Al₆₅Cu₂₀Fe₁₅合金液过冷度的不同，Al₆₅Cu₂₀Fe₁₅合金液的第一形核相也发生变化．此外，提高对Al₆₅Cu₂₀Fe₁₅合金液的净化程度，可以提高合金液的形成Ａｌ－Ｃｕ－Ｆｅ二十面体准晶的能力．

A STUDY OF DEEP UNDERCOOLING FOR Al-Cu-Fe ICOSAHEDRAL QUASICRYSTAL

This work was undertaken to study deep underccoling of Al₆₅Cu₂₀Fe₁₅ alloy melt in Al- Cu - Fe system by cyclic superheating and cooling method. By means of the denucleating technique, Al₆₅Cu₂₀Fe₁₅ alloy melt has been undercooled to 98 K under its melting point, and Al - Cu - Fe icosahedral quasicrystalline ball of 6 mm in diameter was produced. Moreover,the first phase to nucleate will change with the degree of underccoling in alloy melt. It was confirmed that quasicrystal forming ability can be enhanced by increasing the level of denu-cleating in Al₆₅Cu₂₀Fe₁₅ alloy.