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中文摘要：
采用半固态搅拌技术向铝熔体中加入SiO2粉末,通过熔体原位反应成功制备了α-Al2O3pZL109复合材料,并在不同挤压力下对复合材料进行了成形试验。利用扫描电镜和X射线衍射仪对复合材料的微观组织和相组成进行了分析,并测试了其力学性能。结果表明,挤压铸造原位α-Al2O3pZL109复合材料铸件内部缺陷少、增强颗粒均匀分散;挤压铸造后,复合材料在铸态和热处理态的抗拉强度、硬度、伸长率均明显高于ZL109合金,且随挤压力增加而提高。
英文摘要：
Alumina particle reinforced aluminum matrix composites were prepared successfully by in-situ reaction in melt after adding SiO2 powder into aluminum melt via semi-solid mechanical stirring technique.The fabrication of the composites under different squeezing pressures was also investigated.The micro-structure and phase constituent of the composites prepared were analyzed by scanning electron microscope and X-ray diffraction,meanwhile,the tensile properties of the composites were measured.The results reveal that the internal defects of squeeze-casting composites are decreased greatly,and the reinforcement particles are distributed homogeneously into the composites.With the increase of squeezing pressure,the tensile strength,hardness and elongation of both the as-cast and T6heat-treated composites are the higher than those of the matrix ZL109 alloy.Meanwhile,these properties are increased with the increase of squeezing pressure.
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