Microstructural refinement process of pure magnesium by electromagnetic vibrations
Microstructural refinement process of pure magnesium by electromagnetic vibrations
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DOI：
10.1016/j.msea.2005.09.009
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发表时间：
2005-12
期刊：
影响因子：
6.4
通讯作者：
Y. Mizutani;T. Tamura;K. Miwa
中科院分区：
文献类型：
--
作者：
Y. Mizutani;T. Tamura;K. Miwa
在纯镁（99.9mass%）凝固过程中同时施加静磁场和交变电场。通过所产生的电磁振动来细化镁的凝固晶粒。在60- 5000 Hz的振动频率范围内，500 Hz左右的振动频率对镁合金凝固过程中晶粒的细化效果最好。在此频率下，晶粒由未振动状态下的1 mm左右细化到200μm左右。在高于1000 Hz的频率下，电磁振动的晶粒细化效果随着频率的增加而减弱，并且这些样品中的大多数由粗柱状晶组成，而不像其他样品在较低频率下振动。
A static magnetic field and an alternating electric field were simultaneously imposed during solidification of pure magnesium (99.9mass%). The solidified crystal grains of magnesium were refined by the generated electromagnetic vibrations. The vibration frequency of about 500Hz was most effective for the refinement of magnesium crystal grains in the frequency range from 60–5000Hz during solidification. The crystal grains were refined at this frequency to approximately 200μm from about 1mm in the nonvibrated state. At frequencies higher than 1000Hz, the effect of grain refinement by the electromagnetic vibrations became weaker with increasing frequency, and most of these specimens consisted of coarse columnar crystals, unlike other specimens vibrated at lower frequencies.