材料期刊网

采用粉末冶金工艺制备了玻璃纤维(GF)强化的Pb基复合材料(GF/Pb)，并分析了GF尺寸及含量对复合材料的密度、显微组织及拉伸力学性能的影响。结果表明，随着 GF 含量的增加，复合材料的相对密度降低，50μm-GF强化的复合材料的相对密度高于300μm-GF强化的复合材料。低温(<200°C时)烧结所得复合材料呈现出细小均匀的显微组织，且GF均匀分布于Pb基体中。GF的加入显著提高了Pb基复合材料的强度，添加GF尺寸为50μm、质量分数为0.5%的Pb基复合材料比纯Pb的强度高约30 MPa。所有合成的复合材料中，随着玻璃纤维质量分数从0.5%增加到2%，复合材料的强度及拉伸应变均降低。

GF/Pb compositeswerefabricated by the method of powder metallurgy, and the density, microstructure and tensile propertywerecharacterized considering the size and content ofglass fibre (GF). The results show that relative densities decrease with increasing GF fraction, and the 50μm-GF reinforced specimens exhibit a better densification than the 300μm-GF reinforced ones. The GF particles distribute quite uniformly inPb matrix, and the composites fabricated at low sintering temperature (<200°C) possess fine-grain microstructure. The addition of GF significantly improves the strength of the Pb composites, and the ultimate tensile strength of the Pb composite reinforcedwith the addition of 50μm-0.5% GF(mass fraction)is about 30MPa higher than that of GF-free sample. For all composites groups, increasing the reinforcement content from 0.5%to 2%(mass fraction)results in a decrease in both tensile strength and ductility.