以晶化的硅酸铝短纤维(Al2O3-SiO2),sf为增强体、用磷酸铝为预制体粘结剂,通过挤压浸渗工艺制备了(Al2O3-SiO2)sf/AZ91D镁基复合材料.通过光学显微镜、TEM和HREM分析研究了复合材料的界面微观结构和界面反应产物.结果表明:用挤压浸渗法制备的硅酸铝短纤维增强AZ91D镁基复合材料的界面厚度约为100nm,界面上除有一定数量的MgO颗粒和少量的MgAl2O4和Mg2Si颗粒外,还有少量的MgP4等反应产物存在;硅酸铝增强纤维与镁合金基体之间形成了较强界面结合,界面微观结构比较理想.力学性能测试表明,与AZ91D基体合金相比,复合材料的室温抗拉强度提高了约18%,弹性模量提高了约58%.
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