In order to develop high strength, high damping and low density Al matrix composites, the Al/Zn composite bar samples with Zn mass fraction of 10％?40％ were prepared by powder extrusion. The tensile strength and damping properties of the samples are improved by controlling both the Zn/Al diffusion degree and the precipitation of the interfacial phases. The results show that the tensile strength of the samples with Zn mass fraction of 10％?30％ increases with the increases of both the Zn content and annealing temperature. When the Zn mass fraction increases to 40％, the tensile strength of the sample remains basically unchanged or decreases slightly, and the plasticity decreases gradually. Alloying of Al matrix and the formation of Zn/Al interface layer are mainly responsible for improving the strength of the annealed samples. The damping properties increase with the increases of both the Zn content and annealing temperature. The Zn/Al eutectoid lamella eliminates the detrimental effects on damping properties due to both alloying of the Al matrix and reduction of pure Zn in the Al matrix. The Al?30％Zn sample annealed at 350 ℃ for 0.5 h has good comprehensive properties, including the tensile strength of 330 MPa, the elongation to failure of 10％ and the room-temperature damping properties (tan θ) of 0.025.%以开发高强、高阻尼、低密度Al基复合材料为目的,采用粉末挤压方法制备Zn含量(质量分数)为10％～40％的Al/Zn复合棒材试样,通过退火条件控制Zn/Al的扩散程度及界面层的析出形貌,从而提高复合试样的强度和阻尼性能.结果表明,Zn含量10％～30％试样的抗拉强度随Zn含量的增加和退火温度的提高而逐渐增大;Zn含量继续增大至40％时,试样的抗拉强度基本不变或略有下降,而塑性则随之逐渐下降;Al基体的合金化和所形成的Zn/Al扩散界面层是退火试样强度提高的主要原因.随着Zn含量的增加和退火温度的升高,试样的阻尼性能逐渐增大,Zn/Al共析片层部分抵消退火后试样中Al基体的合金化和纯Zn的减少对阻尼性能带来的不利影响,是退火试样具有高阻尼性能的主要原因.Al?30％Zn复合棒材试样经350℃退火0.5 h具有良好的综合性能:室温抗拉强度为330 MPa,断后伸长率为10％,阻尼性能tanθ 为0.025.
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