Influence of Macroscopic Pores on Damping Behavior of Zn-Al Eutectoid Alloy

Foamed Zn-Al eutectoid alloys with macroscopic pores were prepared by air pressure infiltration process.The internal friction and relative dynamic modulus were tested on a multifunction internal friction apparatus (MFIFA) at low frequencies,low strain amplitude and over a temperature range of 25 to 400℃.The effects of macroscopic pores on the damping behavior of the alloy were studied.The results show that the damping capacity of the Zn-Al alloy was enhanced by introducing of the macroscopic pores which increased by 2—4 times in comparison with dense Zn-Al alloy.The damping capacity increased with decreasing the macroscopic pore size,increasing the porosity,decreasing the frequency and increasing the strain amplitude.