纳米SiC颗粒对AZ91D镁合金组织性能的影响

Effect of SiC Nanoparticles on Microstructure and Mechanical Properties of AZ91D Magnesium Alloy

采用高能球磨结合机械搅拌的方法制备了纳米SiCp增强AZ91D镁基复合材料。结果表明,加入纳米SiCp能明显细化晶粒,且纳米SiCp均匀分布于合金中。当加入1.5%的纳米SiCp时,合金晶粒细化效果最佳,屈服强度、伸长率、硬度及弯曲强度较AZ91D镁合金分别提高了45.9%、63.4%、24.3%和6.3%。进一步提高纳米SiCp含量,晶粒细化效果降低,力学性能下降。

SiC nanoparticles reinforced AZ91 D magnesium matrix composites were fabricated by high-energy ball milling integrated with mechanical stirring.The results indicate that the grains in AZ91 Dmagnesium alloy are refined significantly by adding SiC nanoparticles,in which SiC nanoparticles are uniformly distributed.The grains in the AZ91 Dmagnesium alloy exhibit desirable with 1.5% SiC nanoparticles addition.And yield strength,elongation,hardness and bending strength of the composites are improved by 45.9%,63.4%,24.3% and 6.3% than those of AZ91 D magnesium alloy,respectively.However,the grains are coarsened and the mechanical properties are decreased with the excessive SiC nanoparticles addition.