( 上海交通大學(xué) 金屬基復(fù)合材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，
上海 200030)
摘 要: 研究了通過(guò)在熔體凝固過(guò)程中的不同溫度范圍施加高頻磁場(chǎng)制備自生梯度復(fù)合材料的工藝。對(duì)于Al/Mg2Si/Si自生梯度復(fù)合材料，近似計(jì)算及實(shí)驗(yàn)結(jié)果表明： Al+Mg2Si二元共晶區(qū)(555~595℃)是施加高頻磁場(chǎng)的最佳溫度范圍， 此時(shí)處于低粘性熔體中的增強(qiáng)顆粒容易被外加電磁阿基米德力分離。高頻磁場(chǎng)施加溫度過(guò)高或過(guò)低， 均不易使增強(qiáng)顆粒產(chǎn)生梯度分布效果。
關(guān)鍵字: 自生梯度復(fù)合材料； 高頻磁場(chǎng)； 過(guò)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
