Aluminum powder and CuO powder mixture is high energy milled to prepare composite powders ,and then in situ aluminum matrix composites are fabricated by powder metallurgy method .The microstructure and phase are investigated by SEM and X-ray diffraction analysis .The density and compression strength are also tested .The results show that the reinforcement in the in-situ aluminum matrix composite is nano CuAlO 2 particle .The matrix is α-Al in which CuAl2 particles ,about 1 μm in size ,distribute uniformly .It is found that the thermal press parameter has a substantial effect on compression strength of aluminium composites .The compression strength of the in-situ composites , which is hot pressed with 100 M Pa stress in unidirectional pressing mode at 620 ℃ ,is 843 .6 M Pa ,and it increased up to 950 M Pa in bi-directional pressing compression .When hot pressing stress increased from 100 M Pa to 150 M Pa ,the compression strength increases to 1 090 M Pa ,much higher than that of conventional aluminium alloy .%为了制备组织均匀、压缩性能良好的原位纳米颗粒增强铝基复合材料，本文以微米级纯铝粉和氧化铜粉为原料，用改进的高能球磨＋粉末冶金技术制备了原位增强铝基复合材料，研究了所制备的铝基复合材料的显微组织和密度、压缩强度等性能与制备工艺的关系．研究发现：高能球磨480 r/min ，16 h＋单向模压热压烧结620℃，100 MPa ，1 h ，获得纳米级CuAlO2原位增强的铝基复合材料，在铝基体中均匀分布大量尺寸约1μm的CuAl2相．热压工艺对所制备的铝基复合材料的压缩强度有显著影响，620℃，100 M Pa单向模压复合材料的压缩强度为843．6 M Pa ，而双向加压材料的压缩强度提高到950 MPa ；当单向压力提高到150 MPa时，原位铝基复合材料的压缩强度进一步提高到1090 M Pa ．
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