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以纯Al粉及Al2O3粉为原料,采用往复挤压法制备了不同体积分数的Al2O3颗粒增强纯Al基复合材料,并测试了材料的阻尼性能,研究了室温条件下,阻尼与应变振幅及频率变化的关系以及增强颗粒的含量对材料阻尼性能的影响。结果表明:通过往复挤压,Al2O3均匀地分布于Al基体上,形成了致密、均匀的复合材料。往复挤压法制备的Al2O3P/Al复合材料具有良好的阻尼性能,复合材料中增强颗粒含量越大,阻尼性能越好。在较低的应变振幅下,Al2O3P/Al复合材料主要的阻尼机制为位错阻尼机制,而在较高的应变振幅下,界面阻尼则成为复合材料主要的阻尼机制。
Pure Al powder and Al2O3 powder were used as raw materials to prepare Al-particle reinforced pure Al matrix composites with different volume fractions by reciprocating extrusion method. The damping properties of materials were tested. The effects of room temperature on the amplitude and frequency of damping and strain And the effect of increasing the content of particles on the damping properties of the material. The results show that Al2O3 is uniformly distributed on the Al matrix by reciprocating extrusion, forming a dense and uniform composite material. The Al2O3P / Al composite prepared by reciprocating extrusion has good damping properties. The greater the content of the reinforced particles in the composite, the better the damping property. At lower strain amplitudes, the main damping mechanism of Al2O3P / Al composites is the dislocation damping mechanism, while at high strain amplitudes interface damping becomes the main damping mechanism of the composite.