原位反应剂质量分数对复合强化法制备混杂颗粒增强铝基复合材料的影响
Effect of in-situ reactant mass fraction on hybrid particle reinforced aluminum matrix composites prepared by composite strengthening method
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摘要: 采用纳米颗粒强化、热压强化等多种方式相结合的复合强化法，以Al-Si系合金为基体、纳米级CuO颗粒为原位反应剂，外加微米SiC颗粒制备多尺度混杂颗粒增强铝基复合材料，并对其组织形貌进行表征，研究CuO质量分数对其硬度和耐磨性的影响.结果表明：所得复合材料的组织为共晶组织（α+Si）+SiC颗粒+AlCu3颗粒，且随着CuO质量分数的增加，共晶组织的α晶粒和点状Si变得更加细小.当CuO质量分数为3.0%，即试样配方为3.0% CuO+15.0% SiC+82.0% Al-Si时，复合材料的硬度最大，为88.8 HB，比基体硬度（51.8 HB）提高了71.4%；同时，复合材料的磨损量最低，为0.003 0 g，且耐磨性最好，相对耐磨性为2.93%，是基体耐磨性的2.93倍.
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关键词:
- 原位反应剂 /
- 复合强化法 /
- 混杂颗粒增强铝基复合材料 /
- 耐磨性
Abstract: The reinforced aluminum matrix composites was prepared by using the composite strengthening method combining various methods such as nanoparticle strengthening and hot pressing strengthening, with Al-Si alloy as the matrix, nano-scale CuO particles as the in-situ reactant, and micron SiC particles plus multi-scale hybrid particles, the structure and morphology of the composites were characterized, and the effect of the in-situ reactant CuO mass fraction on its hardness and wear resistance was studied. The results showed that the structure of the obtained composites was eutectic structure (α + Si) + SiC particles + AlCu3 particles, and with the increase of the mass fraction of CuO, the α grains and point Si of the eutectic structure became finer. When the CuO mass fraction was 3.0%, that was, the sample formula was 3.0% CuO+15.0% SiC+82.0% Al-Si, the composites had the largest hardness of 88.8 HB, which was 71.4% higher than the matrix hardness (51.8 HB). At the same time, the composites had the lowest wear amount of 0.003 0 g, and the best wear resistance, the relative wear resistance was 2.93%, which was 2.93 times that of the matrix. -
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