SiC_p/Gr颗粒混杂增强6061铝基复合材料中的内耗峰及其阻尼机制

Internal friction peak and its damping mechanism for 6061Al alloy/SiC_p/Gr MMC

采用喷射共沉积方法制备了SiCp/Gr/ 6 0 6 1铝合金混杂金属基复合材料 ,研究了其阻尼特性。结果表明 :该材料在 15 0℃附近有一温度内耗峰 ,且随频率增加该峰峰位向高温移动而峰高降低。通过Arrhenius方程测得内耗峰的激活能为 1.17eV。分析认为 :该峰具有弛豫特性 ,它是在热与应力的双重作用下 ,由位错拖曳点缺陷运动所致 ,符合位错诱生阻尼机制。

Damping properties of the SiC p/Gr/6061Al alloy MMC, which was fabricated by spray atomization and deposition, were studied. The results show that, the internal friction spectra of the samples exhibit internal friction peak at about 150 ℃. Furthermore, the peak temperature increases with increasing frequencies, and the activation energy of the internal friction peak is calculated to be 1.17 eV by Arrhenius equation. Through a series of analyses, it is described that the internal friction peak is of relaxation model, and results from the dislocation movement dragging the point defect under the double action of heat and stress. Its mechanism is of the dislocation-induced damping.