| 旋转磁场对共晶铝硅合金宏观组织影响机理的探究 |
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| 引用本文： | 段红萍.旋转磁场对共晶铝硅合金宏观组织影响机理的探究[J].西安文理学院学报,2014(4):40-43. |
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| 作者姓名： | 段红萍 |
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| 作者单位： | 福建信息职业技术学院机电工程系; |
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| 摘 要： | 旋转磁场的搅拌作用能抑制枝晶的生长,增加游离晶的数量,因此共晶Al-Si合金宏观组织的晶粒呈明显细化趋势,且晶粒尺寸也随着磁场强度的增加而变得均匀化.磁场冲刷产生的大量游离晶核来不及完全重熔,变成等轴晶的晶核,有利于等轴晶的生长,所以随着磁场强度的增加,共晶Al-Si合金柱状晶区宽度减少,等轴晶区宽度增大.旋转磁场使柱状晶迎流侧和背流侧的过冷度不同,使其生长方向发生偏转,转向迎流方向生长,且随磁场强度的增大,柱状晶偏转的角度增大.
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| 关 键 词： | 旋转磁场 共晶铝硅合金 宏观组织 |
Research on the Effect of Rotating Magnetic Field on the Macrostructure of Eutectic Al-Si Alloy |
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| DUAN Hong-ping.Research on the Effect of Rotating Magnetic Field on the Macrostructure of Eutectic Al-Si Alloy[J].Journal of Xi‘an University of Arts & Science:Natural Science Edition,2014(4):40-43. |
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| Authors: | DUAN Hong-ping |
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| Institution: | DUAN Hong-ping ( Department of Mechanical and Electrical Engineering, Fujian Polytechnic of Information Technology, Fuzhou 350003, China) |
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| Abstract: | The electromagnetic stirring of rotating magnetic field can restrict the growth of den- drites and increase the number of free grains. Therefore, the grain size in the macrostructure of eutectic A1-Si alloy tend to be more refined and the grain size is homogenized with the increase of magnetic field intensity. The crystal nuclei of equiaxed crystals are left over before the crystal nuclei of free grains are thoroughly melted by the washing of rotating magnetic field. This trans- formation is beneficial to the growth of equiaxed crystals. Therefore, with the increase of mag- netic field intensity, the width of columnar crystal zone decreases on entectic A1-Si alloy while that of equiaxed grain zone expands. The effect of rotating magnetic field gives rise to the diffe- ring undercoolings of columnar crystals between the front and the lee face, with the growth of columnar crystals turning to the front. Also, with the increase of magnetic field intensity, the deflecting angle of columnar crystals expands. |
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| Keywords: | rotating magnetic field eutectic A1-Si alloy macro-structure |
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