多孔铜的阻尼行为研究

为了研究宏观孔的引入对铜的阻尼性能的影响,运用气压渗流法制备了多孔铜,并利用多功能内耗仪对材料的阻尼行为进行了研究.研究发现,材料的阻尼性能得到提高,提高的幅度随孔隙率的增大或孔径的减小进一步增加,并对应变振幅有明显的依赖性.通过透射电镜微观分析,发现多孔铜中存在大量位错.试验结果表明,宏观孔和位错是材料阻尼性能提高的两大影响因素.

Research on Damping Behavior of Porous Cu

To study the effects of macroscopic pores on the damping behavior of Cu,porous Cu specimens were prepared using pressure infiltration process.Its damping behavior was investigated using multifunction internal friction apparatus.It was found that the damping capacity of porous Cu is higher than that of its bulk metal,increases with the increment of porosity and the decrement of pore size,and typically depends on strain amplitudes.TEM observations show that a lot of dislocations exist in porous Cu.The experimental result shows that macroscopic pores and dislocations are the main contributors to damping mechanism of porous Cu.