| 熔体处理对A357合金枝晶搭接点的影响 |
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| 引用本文： | 李建峰,李金山,寇宏超,陈忠伟,胡锐,王一川,傅恒志,周廉.熔体处理对A357合金枝晶搭接点的影响[J].中国有色金属学报,2006,16(3):470-475. |
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| 作者姓名： | 李建峰 李金山 寇宏超 陈忠伟 胡锐 王一川 傅恒志 周廉 |
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| 作者单位： | 西北工业大学,凝固技术国家重点实验室,西安,710072 |
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| 摘 要： | 采用双热电偶法分别测得不同熔体处理A357合金的枝晶搭接点，进而通过热分析法分别计算出枝晶搭接点的固相体积分数fs^coh。结果表明，冷却速率和晶粒细化处理对fs^coh的增大有较大影响；而变质剂（Sr）对fs^coh值的影响不明显。分析表明，冷却速率的提高以及晶粒细化剂的加入细化了晶粒和延缓枝晶的生长，从而提高fs^coh，而Sr的加入只改变Si的形态，对fs^coh的影响不大。
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| 关 键 词： | A357合金 枝晶搭接点 双热电偶 冷却速率 熔体处理 |
| 文章编号： | 1004-0609（2006）03-0470-06 |
| 收稿时间： | 2005-07-08 |
| 修稿时间： | 2005-11-11 |
Effect of melt treatment on dendrite coherency of A357 alloys |
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| LI Jian-feng,LI Jin-shan,KOU Hong-chao,CHEN Zhong-wei,HU Rui,WANG Yi-chuan,FU Heng-zhi,ZHOU Lian.Effect of melt treatment on dendrite coherency of A357 alloys[J].The Chinese Journal of Nonferrous Metals,2006,16(3):470-475. |
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| Authors: | LI Jian-feng LI Jin-shan KOU Hong-chao CHEN Zhong-wei HU Rui WANG Yi-chuan FU Heng-zhi ZHOU Lian |
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| Abstract: | The dendrite coherency point of A357 alloy was determined after melt-treatment by double-thermo-(couple),and the solid volume fraction of coherency(f~(coh)_s)was calculated by thermal analysis.The effects of adding grain refiner Sr to the melt to modify the eutectic and the cooling rate on the increase of f~(coh)_s were investigated.The(results) show that the cooling rate and the addition of grain refiner significantly increase the solid volume fraction of coherency of the alloys,but the modification(Sr) has little effect on f~(coh)_s.The increase of cooling rate and the addition of grain refiner fine the grain and postpone the formation and growth of dendrite.The addition of Sr changes the morphology of Si,but has little effect on f~(coh)_s. |
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| Keywords: | A357 alloy dendrite coherency point double-thermocouple cooling rate melt treatment |
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