Solidified Structure of Al Alloys by a Local Imposition of an Electromagnetic Oscillationg Force
Solidified Structure of Al Alloys by a Local Imposition of an Electromagnetic Oscillationg Force
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DOI：
10.2355/isijinternational.43.842
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发表时间：
2003-06
影响因子：
1.8
通讯作者：
T. Takagi;K. Iwai;S. Asai
中科院分区：
文献类型：
--
作者：
T. Takagi;K. Iwai;S. Asai
研究了通过同时施加静磁场和交流电来局部施加振荡的电磁法对铝合金凝固组织的细化。从势能的角度出发，在考虑作用在颗粒上的重力和磁化力的情况下，从理论上预测了凝固过程中析出的初级固体颗粒的稳定位置，并推导了初级颗粒在熔体中的移动时间。实验中，通过施加电磁振动，Al-6mass%Si获得了细化的组织，而Al-15mass%Si的宏观组织并未通过该方法细化。液态Al-15mass% Si中析出的β初生相主要出现在理论预测的位置。但Al-6mass%Si中的a初生相在整个样品区域都观察到，尽管理论上稳定的位置是样品的底部。理论预测与实验结果之间的差异可以用一次粒子的移动时间来解释，在Al-6mass%Si的情况下，实验中移动时间不足以达到稳定位置。
Refinement of a solidified structure of aluminum alloys by an electromagnetic method in which oscillation was locally imposed by a simultaneous imposition of a static magnetic field and an alternating current has been investigated. In the viewpoint of potential energy, stable positions of a primary solid particle precipitated during solidification were theoretically predicted under the consideration of the gravitational force and the magnetization force acting on the particle, and furthermore, moving time of the primary particle in a melt was derived. In the experiment, a refined structure was obtained for an Al-6mass%Si by imposing the electromagnetic vibration while a macro-structure of an Al-15mass%Si was not refined by this method. The primary phase of β precipitated in the liquid Al-15mass% Si was mainly observed at the theoretically predicted positions. But the primary phase of a in the Al-6mass%Si was observed in the whole area of the sample though the theoretically stable position was the bottom n the sample. The discrepancy between the theoretical prediction and the experimental result can be explained by the moving time of primary particles, which is not enough in the experiment to reach the stable position in the case of the Al-6mass%Si.