Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第17卷    第2期    总第95期    2007年2月

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文章编号:1004-0609(2007)02-0313-07
强磁场下过共晶铝硅合金凝固过程中
初晶硅的迁移行为
晋芳伟,任忠鸣,任维丽,邓 康,钟云波,余建波

(上海大学 材料科学与工程学院, 上海 200072)

摘 要: 研究了在磁场梯度约为25 T/m条件下不同磁场强度以及磁场强度约为5 T时不同磁场梯度对半熔态Al-18Si合金凝固过程中初晶硅迁移行为的影响。结果表明:当磁场强度大于2.3 T时,初晶硅开始迁移,但没有偏聚;当磁场强度达到6.6 T时,初晶硅发生迁移并聚集,产生明显的聚集层;且随着磁场强度的进一步增大(磁场强度分别增至7.79.9 T),聚集层的厚度基本保持不变;当磁场强度不变,随着磁场梯度的增大,初晶硅的偏聚量增加,晶粒尺寸变小。并对磁场强度影响初晶硅迁移的机制进行了探讨。

 

关键字: Al-Si合金;强磁场;梯度磁场;磁化力;迁移;凝固

Migratory behaviors of primary crystal silicon
in hypereutectic Al-Si alloy under high magnetic field
JIN Fang-wei, REN Zhong-ming, REN Wei-li, DENG Kang,
ZHONG Yun-bo, YU Jian-bo

School of Materials Science and Engineering, Shanghai University,Shanghai 200072, China

Abstract:The migration behaviors of the primary Si grains during solidification of Al-18Si alloy from mushy zone was investigated under various magnetic flux density and gradient. The effects of magnetic flux on the migration were investigated when the magnetic field gradient was set at 25 T/m, the effects of the field gradient was investigated when the flux density was set at 5 T. The results show that the migration behaviors of the primary Si grains do not take place until the magnetic flux density is over 2.3 T. The primary Si grains tend to migrate and form a remarkable Si-rich layer at magnetic flux of 6.6 T. The thickness of Si-rich layer is almost unchanged with further increase of magnetic flux density. The amount of segregated primary silicon grains increases with increasing magnetic gradient, whereas the grain size decreases. The mechanism of influence of the magnetic flux density on the migratory behavior was discussed.

 

Key words: Al-Si alloy; high magnetic field; gradient magnetic field; magnetization force; migration; solidification

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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