Eliminating the Hard Spots in RE Modified Al Alloy Die Castings

Tang Duoguang  Mao Xiemin  Cheng Qimin  Li Jinhui  Shao Minhua

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Eliminating the Hard Spots in RE Modified Al Alloy Die Castings
Issue S1, Pages: 96-97(2002)
Published： 2002 ，
DOI：

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Tang Duoguang Mao Xiemin Cheng Qimin Li Jinhui Shao Minhua. Eliminating the Hard Spots in RE Modified Al Alloy Die Castings. [J]. Special Casting & Nonferrous Alloys (S1):96-97(2002)
DOI：

Tang Duoguang Mao Xiemin Cheng Qimin Li Jinhui Shao Minhua. Eliminating the Hard Spots in RE Modified Al Alloy Die Castings. [J]. Special Casting & Nonferrous Alloys (S1):96-97(2002) DOI：

摘要

初生硅和AlSiMnFe金属间化合物是造成铝合金压铸件中硬质点区域的主要因素

常规钠盐变质不能细化初生硅和Fe相

含有一定比例La

Nd和Yb的特殊配制的稀土合金不仅能细化共晶硅

而且能细化初生硅并改善Fe相形貌。其中初生硅可细化到小于 10 μm

因此能有效消除铝合金压铸件中的硬质点区域

Abstract

The hard spot area in aluminum alloy die casting mainly originates from the primary silicon and AlSiMnFe intermetallic compound. The primary silicon and Fe phase can not be refined with conventional sodium salt modification. Specially prepared RE almoy with a definite ratio of La

Nd and Yb not only can refine eutectic silicon but also refine primary silicon less than 10 μm in size and improve morphology of Fe phase

so the hard spot area in aluminum alloy die casting could be eliminated effectively.