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为克服颗粒增强铝基复合材料的强度低、脆性大、机械加工难等问题，选用平均直径为０．１５μｍ，细小且接近圆形的Ａｌ２Ｏ３颗粒增强ＬＤ２铝合金，对其铸态材料和挤压材料的室温及高温拉伸性能进行了考察和组织分析，结果发现：颗粒尺寸小到亚微米级之后，材料的组织中极难观察到位错，增强机制也有所变化。在３０～４０％体积率的挤压材上得到了６４０～７６０ＭＰａ拉伸强度和８．６～２％的延伸率，增强率达到了２１２％，获得了高强度、高塑性、易加工性的复合材料。
In order to overcome the problems of low strength, brittleness and difficult mechanical processing of particle reinforced aluminum matrix composites, Al2O3 particles with an average diameter of 0.15μm and small and nearly round shape were used to reinforce LD2 aluminum alloy. The as-cast material and extrusion Materials at room temperature and high temperature tensile properties were investigated and microstructure analysis showed that: particle size as small as sub-micron, the material is extremely difficult to dislocation observed in the organization, the enhancement mechanism has also changed. The tensile strength of 640 ~ 760MPa and the elongation of 8.6 ~ 2% were obtained on the extrusion material with the volume ratio of 30 ~ 40%, the enhancement rate reached 212%, and the high strength, high plasticity and easy processability Composites.