超声法制备纳米sic 颗粒增强az61 镁基复合材料的显微组织.pdfVIP

第 19 卷第 5 期 中国有色金属学报 2009 年 5 月 Vol.19 No.5 The Chinese Journal of Nonferrous Metals May 2009 文章编号：1004-0609(2009)05-0841-06 超声法制备纳米SiC 颗粒增强AZ61 镁基 复合材料的显微组织 胡 志，闫 洪，聂 俏，凌李石保 (南昌大学 先进成形制造及模具研究所，南昌 330031) 摘 要：采用高能超声方法制备纳米 SiC 颗粒增强 AZ61 镁基复合材料，通过 SEM 和 XRD 技术对复合材料的微 观组织和成分进行研究与分析。在 Lennard-Jones 势函数的基础上对超声分散纳米颗粒进行了理论探讨。结果表 明：在超声作用下，质量分数为 1%的纳米 SiC 颗粒在 AZ61 镁合金中得到弥散分布；颗粒之间存在的范德华力 使得颗粒连接在一起，范德华力与颗粒半径和颗粒间距离的关系表明：直径为 100 nm 的 SiC 颗粒之间最大的范 德华力约为 135 nN，分散团聚纳米颗粒的最小压强约为 17.2 MPa。 关键词：AZ61 镁合金；纳米 SiC；超声振动；显微组织 中图分类号：TB 333 ；TB 51 文献标识码：A Microstructure of SiC nanoparticles reinforced AZ61 magnesium composites fabricated by ultrasonic method HU Zhi, YAN Hong, NIE Qiao, LING Li-shi-bao (Institute of Advanced Forming Manufacturing and Die Mold, Nanchang University, Nanchang 330031, China) Abstract: SiC nanoparticles reinforced AZ61 magnesium composites were fabricated by ultrasonic method. The microstructure and components of the composite were investigated by scanning electron microscopy (SEM) and XRD. Based on the Lennard-Jones potential function, the theory of dispersion nanoparticles by ultrasonic were also discussed. The results show that 1.0% (mass fraction) SiC nanoparticles can be dispersed very well in AZ61 magnesium matrix by ultrasonic dispersion. The particles are joined by van der Waals force. The relationships among van der Waals force, the radius and the distance between particles show that the maximal van der Waals force is approximately 135 nN between