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材料工程  2010 

电磁场对A1-18%Si过共晶合金初晶Si相形貌的影响

Keywords: 电磁振荡,直流磁场,交流电场,A1-Si过共晶合金

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Abstract:

研究了交流电场、直流磁场和二者复合产生的电磁振荡对A1-18%(质量分数)Si过共晶初晶Si相形貌的影响.结果表明交流电场、直流磁场和电磁振荡都使合金初晶Si相的大小经历了一次细化过程,交流电场使Si原子有序偏聚团的尺寸和数目发生改变,增大形核率,细化初晶Si相;直流磁场通过电磁制动效应抑制了初晶Si相的形核与长大;电磁振荡细化作用是通过减弱合金的成分过冷和温度梯度从而增大过冷度实现的.三者相比,在电磁振荡的作用下初晶Si相更为细小.

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