Abstract
We study experimentally the temperature spectra of internal friction (IF) andrelative dynamic modulus (RDM) in a foamed Zn-Al eutectoidalloy. The specimens with macroscopic pores (0.5-1.0 mm) wereprepared in an air pressure infiltration process. The damping behaviour ofthe foamed Zn-Al eutectoid alloy is characterized by IF. The IF andRDM measurements at a maximum surface shear strain of 20×10-6have been made by using a multi-function internal friction apparatus atfrequencies of 0.5, 1.0 and 3.0 Hz fromroom temperature to the equilibrium eutectoid isotherm of 277 °C,while continuously changing the temperature cycle. At low frequency, an IFpeak is observed in the IF temperature curve. The IF peak is of a grainboundary, which is associated with the diffusive flux on a crystallineboundary between the like-phases of Al/Al. Its activation energy hasbeen calculated to be 1.10±0.06 eV and the pre-exponential factorτ0 is 10-14 s in the IF measurements.
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