( 上海交通大學 金屬基復合材料國家重點實驗室，
上海 200030)
摘 要: 研究了通過在熔體凝固過程中的不同溫度范圍施加高頻磁場制備自生梯度復合材料的工藝。對于Al/Mg2Si/Si自生梯度復合材料，近似計算及實驗結果表明： Al+Mg2Si二元共晶區(qū)(555~595℃)是施加高頻磁場的最佳溫度范圍， 此時處于低粘性熔體中的增強顆粒容易被外加電磁阿基米德力分離。高頻磁場施加溫度過高或過低， 均不易使增強顆粒產生梯度分布效果。
關鍵字: 自生梯度復合材料； 高頻磁場； 過共晶； Al/Mg2Si/Si合金
composites with high frequency magnetic field
（State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University,
Shanghai 200030, China）
Abstract: The method for preparing in-situ graded composites was investigated by imposing high frequency electromagnetic field in different temperature ranges during their solidifications. Through approximate calculations and experiments, it is showed that the best temperature range for exerting the high frequency electromagnetic field exists in the Al+Mg2Si binary eutectic area(555-595℃) in the case of Al/Mg2Si/Si in-situ graded composite, where the reinforcing particles can be easily separated in the low viscous melt. Otherwise, reinforcements can hardly distribute as desired.
Key words: in-situ graded composite; high frequency magnetic field; hyper eutectic; Al/Mg2Si/Si alloy
