【摘要】 高频磁场作用下利用电磁相分离工艺成功的制备了Al-Si过共晶合金自生梯度复合材料,通过改变磁场作用时间来控制初生硅的迁移,以使其更好地沿径向成梯度分布。分析了合金组织的形成机理,并测试试样硬度和硅含量的分布。结果表明,试样的心部大部分是共晶组织,硬度为HV100左右,表层区富集了大量的初生硅,硅的含量明显高于合金成分,硬度可以达到HV800,在二者之间形成很好的过渡层,使增强相和基体得到很好的结合。更多还原

【Abstract】 Hypereutectic Al-Si in-situ graded composite was produced by electromagnetic separation process under high frequency magnetic field, In order to control migration of Si and make it distribute graded along the radial direction, different imposing time of high frequency magnetic field is used. In this paper, the microstructure of alloy is analyzed. Sample Hardness (HV) and distribution of Si are tested. The results show that the center of sample mainly consists of eutectic structure with hardness of HV 100 approximately, while the surface layer is rich in Si and its Hardness is up to HV 800. A transitional layer was formed between the center area and the surface layer, which integrates reinforced phase and matrix firmly.更多还原