| 锶在铸造铝硅合金中的变质行为 |
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| 引用本文： | 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,2005,25(3):146-149. |
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| 作者姓名： | 董光明 孙国雄 廖恒成 |
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| 作者单位： | 东南大学
(董光明，孙国雄)，东南大学(廖恒成) |
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| 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.
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| 关 键 词： | 锶 变质 铸造铝硅合金 |
| 文章编号： | 1001-2249(2005)03-0146-04 |
| 修稿时间： | 2004年12月20 |
Modification of Cast Al-Si Alloy with Sr |
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| Dong Guangming,Sun Guoxiong,Liao Hengcheng.Modification of Cast Al-Si Alloy with Sr[J].Special Casting & Nonferrous Alloys,2005,25(3):146-149. |
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| Authors: | Dong Guangming Sun Guoxiong Liao Hengcheng |
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| 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,P,Bi,Ca and MM(mistchmetal) have the detriment to the Sr modification. |
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| Keywords: | Sr Modification Cast Al-Si Alloy |
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