纳米Al2O3P/6061铝基复合材料时效硬化特性的研究

探讨了不同纳米氧化铝颗粒含量、不同时效温度对纳米Al2O3P／6061铝基复合材料时效硬化行为的影响，结果发现，因强化相颗粒与铝合金基体的热膨胀系数差异．提供了析出物形成与成长的驱动力，导致其峰时效时间随强化相颗粒含量的增加及时效温度的升高而缩短，但其峰时效硬度会因时效温度提高使得析出物过度成长而随之降低。复合材料因受强化相与基体材料热膨胀系数的差异、强化相造成的铝合金晶粒细化以及强化相颗粒分散强化等三项因素影响，其硬度值随强化相颗粒增加而提高。

Study on the Aging Hardening Behavior of Nano Al2O3P/6061 Composites

The influence of different Al_2O_3 particulate contained and different aging temperature on aging hardening behavior of nano Al_2O_(3p)/6061 composites was discussed.The result shows the peak-aging time of the composites decrease with increasing aging temperature,because the different thermal coefficient of the Al_2O_3 particulate and 6061-aluminum alloy provid the driving force to nucleation of precipitate.And the peak-aging hardness also decreases with increasing aging temperature,because of over growth of precipitate.The hardness of the composites decreases with increasing of the weight percent of the Al_2O_3 particulate.This is because of the composites influenced by the different thermal coefficient of the Al_2O_3 particulate and 6061-aluminum alloy,the fine grain size hardening resulted from the ceramic particulate and the dispersion hardening resulted from the uniform particulate distribution.