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利用渗流法制备出多孔Al和多孔ZA2 7合金 (孔径和孔体积分数分别为( 1 .0± 0 .5 )mm及 5 0 %～ 75 % ) ,以及相同基体、相同尺寸的石墨颗粒增强复合材料(石墨颗粒体积分数为 1 9%～ 94% ) ,对比研究了宏观孔洞和颗粒对材料阻尼 (内耗 )行为的影响 .实验表明 ,对于本征阻尼较小的工业纯铝 ,引入一定数量的孔洞或石墨颗粒 ,由于宏观与微观缺陷的综合效应 ,内耗显著提高 ;对于本征阻尼较高的ZA2 7合金 ,引入孔洞对其内耗影响很小 ,而引入宏观尺度的石墨颗粒 ,其低温内耗变化不大 ,高温内耗峰明显下降 ,其原因为石墨颗粒对原有内耗机制的抑制 .
The porous Al and porous ZA2 7 alloy were prepared by the seepage method (pore volume and pore volume fraction were (1.0 ± 0.5) mm and 50% -75%, respectively), and graphite particles reinforced composite with the same matrix and same size (Graphite particles volume fraction of 19% ~ 94%), the macroscopic pores and particles on the material damping (internal friction) behavior were compared.Experiments show that for the smaller intrinsic aluminum industry, the introduction of a certain amount of The internal friction is significantly increased due to the combined effect of macroscopic and microscopic defects. For the intrinsically damped ZA2 7 alloy, the introduction of pores has little effect on the internal friction, whereas the introduction of macro-scale graphite particles with low internal friction loss Not large, high temperature loss peak decreased significantly, the reason for the graphite particles on the inhibition of the original mechanism of internal friction.