Vibratory Response Characteristic of the NiTi/PZT Composites

The NiTi/PZT composites have been prepared by the method of depositing ferroelectric ceramics(FC) films on the NiTiSMA coll-rolled foil substrate with the sol-gel routes,and combined with the sintering at 650 ℃.The Dynamic Mechanical Analyzer(DMA) is utilized to test the internal friction (tanδ) as functions of temperatures(t)and vibration frequencies for NiTi/FC composites and the NiTiSMA substrates having an aging at 650 ℃,and the differences are shown for the two materials.The vibratory response characteristics are studied by analyzing the rules of internal friction vs temperatures and vibration frequencies.The results show that the vibratory response for the NiTi/PZT is the better than the NiTiSMA and the ranges of the responding frequencies increase from 10 Hz to 33 Hz.The height of the mutation peak in tanδ-t curves is enhanced from 3% to 5%,increasing above 60%.