采用空气加压渗流技术制备了宏观石墨颗粒增强铜基形状记忆合金复合材料，利用多功能内耗仪研究了其阻尼行为及阻尼机制。结果表明：复合材料的阻尼性能比基体合金的大大提高，其内耗随石墨颗粒体积分数的增加、石墨颗粒粒径的减小和应变振幅的增大而增大；基体和石墨颗粒的本征阻尼、位错阻尼和颗粒／基体界面阻尼是复合材料的主要阻尼机制。
A Cu-based shape memory alloy （SMA） composite reinforced with macroscopic graphite particulates （Gr/Cu-based SMA） was prepared by using air pressure infiltration process, and its damping behavior and damping mechanism were studied by using a multifunction internal friction apparatus. The results show that the damping capacity of the composite was higher than that of the matrix alloy, and the internal friction of the composite increased with the increase of graphite particulate volume fraction and strain amplitude, and with the decrease of the diameter of graphite particulates. The intrinsic damping of the substrate and the graphite particulates, dislocation damping and interface damping were the main damping mechanisms of the composite.
参考文献
| [1] | 张小农.高阻尼金属基复合材料的发展途径[J].材料工程,1997(09):34. |
| [2] | 魏健宁,欧阳卫强,余剑敏,李根梅.宏观石墨颗粒对工业纯铝阻尼性能的影响[J].机械工程材料,2008(08):60-63. |
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