Modification of Cast Al-Si Alloy with Sr

Dong Guangming  Sun Guoxiong  Liao Hengcheng

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Modification of Cast Al-Si Alloy with Sr
Issue 3, Pages: 146-149(2005)
Published： 2005 ，
DOI：

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[1]董光明,孙国雄,廖恒成.锶在铸造铝硅合金中的变质行为[J].特种铸造及有色合金,2005(03):146-149+126.

Dong Guangming Sun Guoxiong Liao Hengcheng. Modification of Cast Al-Si Alloy with Sr. [J]. Special Casting & Nonferrous Alloys (3):146-149(2005)
[1]董光明,孙国雄,廖恒成.锶在铸造铝硅合金中的变质行为[J].特种铸造及有色合金,2005(03):146-149+126. DOI：

Dong Guangming Sun Guoxiong Liao Hengcheng. Modification of Cast Al-Si Alloy with Sr. [J]. Special Casting & Nonferrous Alloys (3):146-149(2005) DOI：

摘要

最为人们接受的硅的变质机理是杂质诱发孪晶假说。锶的变质能力强

且变质有效期长。锶的孕育期的长短主要与铝硅合金液中磷的含量有关。由于共晶硅中的孪晶密度随硅的生长速度的降低而减少

锶变质要求合金冷却速度要高于一定的临界值。磷、锑、铋、钙、稀土等元素对锶的变质有毒化作用。锶变质会导致铸件中孔洞的增加。

Abstract

The tranditional hypothesis on modification of eutectic silicon in Al-Si alloys is that the impurity induces twin-crystal proposed by Shu and Hellawell.Sr modification has features of strong modification ability and long effective modification period.Sr incubative period is mainly relevant to the P concentration in the melt.With Sr modification

the cooling rate of the melt should be higher than a critical value due to decreasing in the twin-crystal density with the decrease of the growth rate of the eutectic silicon.Sr modification can result in the increase of the porosity in the Al-Si castings.Sb

Ca and MM（mistchmetal） have the detriment to the Sr modification.