往复挤压法制备Al_2O_(3P)/Al复合材料的室温阻尼性能

Room-temperature damping capacity of Al_2O_(3P)/Al composites prepared by reciprocating extrusion

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。

Al2O3/Al composites of different volume fractions were produced by using reciprocating extrusion technology with pure Al powder and Al2O3 particle.Then the damping capacity of the composites was measured.Relationship of damping behavior and strain amplitude or frequency,and the contribution of different content of reinforced particles to damping capacity were investigated.The result shows that the Al2O3 particles homogeneously distributed in Al matrix,and the Al2O3P/Al composite prepared by reciprocating extrusion has an excellent damping capacity.The damping property improves with increase of the particles content.At low strain amplitude,the main damping mechanism of Al2O3P/Al composites is dislocation damping,whereas at high strain amplitude,interface-sliding damping becomes the main damping mechanism.