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采用熔体反应法,以Al-ZrSiO4为反应体系,在反应过程中施加脉冲磁场,原位合成Al3Zr和Al2O3颗粒增强铝基复合材料。X射线衍射仪(XRD)、扫描电镜(SEM)和电子探针(EPMA)分析表明:脉冲磁场作用下,原位合成的颗粒细小,尺寸为1～3μm,且弥散分布于基体中;随外加脉冲磁场强度的增大,反应生成的增强颗粒变得更加细小,分布更均匀。拉伸实验结果表明:脉冲磁场作用下原位合成复合材料的抗拉强度随着脉冲磁场强度的增大而升高,当磁场强度为0.05 T时,复合材料的抗拉强度比未施加脉冲磁场的复合材料提高28%;伸长率随磁场强度的增大略微下降。拉伸断口形貌分析表明:脉冲磁场作用下复合材料断口形貌中的韧窝和撕裂纹大大减少,但仍属于塑性断裂。
Al-ZrSiO4 was used as the reaction system in the melt reaction method. A pulsed magnetic field was applied during the reaction to synthesize Al3Zr and Al2O3 particles in-situ to reinforce aluminum matrix composites. X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe (EPMA) analysis showed that: the pulse magnetic field, in situ synthesis of small particles, the size of 1 ~ 3μm, and dispersedly distributed in the matrix; Pulsed magnetic field strength increases, the reaction produces enhanced particles become more small, more evenly distributed. Tensile test results show that the tensile strength of composites synthesized by in-situ pulsed magnetic field increases with the increase of pulsed magnetic field strength. When the magnetic field strength is 0.05 T, the tensile strength of composites is higher than that without pulsed magnetic field Of the composite material increased by 28%; Elongation rate decreased slightly with the increase of magnetic field strength. Tensile fracture morphology analysis shows that the dimples and tearing cracks in the fracture morphology of the composites under the pulsed magnetic field are greatly reduced, but still belong to the plastic fracture.