基于 SiO 2/Al-10Si 反应体系，通过半固态机械搅拌法及高能超声处理组合工艺，成功制备出Al2 O 3颗粒增强铝基复合材料.SiO 2粉体预处理及铝熔体 Mg 元素活化有效改善了两者间的润湿性，在转速700 r/min、搅拌10 min 的条件下，可获得 SiO 2颗粒均匀分布的微观组织；升温后，经过高能超声进一步熔体处理，不仅促进了 SiO 2/Al 的原位置换反应，而且空化消除了残余气体.金相显微镜(OM)、X 射线衍射仪(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)的分析检测表明，原位生成的 Al2 O 3颗粒均匀地分布于 Al-Si 合金基体中.
Based on the SiO 2/Al-10Si reaction system,Al2 O 3 particle reinforced aluminum matrix composites was successfully prepared through the combined process of semi-solid mechanical stirring and high-energy ultra-sound treatment.Pretreatment of SiO 2 powder and activation of aluminum melt by Mg improve the wettability of each other.Under the condition of a 700 r/min stirring speed and a 10 min stirring time,uniform distribution of SiO 2 particles can be obtained.After the temperature increased,a further step of the high-energy ultrasonic treatment to the melt followed,not only promoting the in-situ displacement reaction of SiO 2 and Al,but also eliminating the residual gas by acoustic cavitation.The analysis through optical microscopy (OM),X-ray dif-fraction (XRD),scanning electron microscopy (SEM)and energy dispersive spectroscopy (EDS)showed that in situ processed Al2 O 3 particles distributed uniformly in the aluminum silicon alloy matrix.
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