电磁场作用下(Al_2O_3+Al_3Zr)_p/Al复合材料的梯度效应  

Gradient Effects of (Al_2O_3+Al_3Zr)p/Al Composites in Electromagnetic Field

作　　者：李桂荣[1] 王利[1] 赵玉涛[1] 戴起勋[1] 王宏明[1] 程晓农[1] 陈刚[1] 

机构地区：[1]江苏大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2007年第9期722-724,共3页Special Casting & Nonferrous Alloys

基　　金：江苏省高技术研究资助项目(BG2005026);江苏省科技成果转化项目(BA2005054);江苏省铝基复合材料工程中心研发基金资助项目(BM2003014);江苏省高校自然科学研究指导性项目(05KJD450043)

摘　　要：以原位合成的Al2O3、Al3Zr颗粒增强铝基复合材料作为预熔料,颗粒体积分数为15%,颗粒粒度为2～3μm。在恒温870℃时施加30s频率为20kHz的高频交变电磁场,集肤深度为5.314mm,线圈内输入电流80A,刚玉坩埚置于线圈边缘部位,对应位置处的磁感应强度为0.1T。扫描电镜分析复合材料水淬试样,结果表明,试样中心部位颗粒体积分数基本不变,靠近线圈5mm处颗粒体积分数减少至10%,靠近线圈边缘部分的颗粒体积分数增加至20%,呈现出一定梯度效应,这是电磁挤压力作用的结果。颗粒迁移效率的影响因素有:颗粒体积分数、粒径、熔体温度、磁感应强度、分布及其磁场作用时间。High frequency alternative electromagnetic field was implemented on the in-situ (Al2O3+Al3Zr)p/Al composites with 15% volume fraction and particle size of 2～3 μm at 870 ℃for 30 s, in which skin effect depth is 5.314 mm, and input current in coil is 80A, and alundum crucible is set on side of the coil with magnetic flux of 0.1T. The microstructure of water quenched (Al2O3+Al3Zr)p/Al composites was analyzed by scanning electron microscope (SEM). The results reveal that the particle volume fraction in the center hardly changes while it is decreased by 10%with the distance from coil 5mm , and it is increased by about 20%nearby side of coil, exhibiting gradient effects to a certain, which is attributed to the electromagnetic force. The factors influencing particle evolved effects include particle volume fraction, particle diameter, melt temperature, magnetic induction flux and magnetic field time.

关 键 词：颗粒增强复合材料 高频交变磁场 梯度效应 电磁压力 

分 类 号：TB333[一般工业技术—材料科学与工程]