The experimental results show that the internal friction peak of the material in the three conditions appears differently, and the influence of temperature on the characteristics of frequence of internal friction in the 3-Point Bending mode is greatest;the strain-amplitude effects of the three.

The results show that, the internal friction spectra of the samples exhibit internal friction peak at about 150 ℃.

Moreover, two relaxation damping peaks were found in the composite samples, peakⅠon about 150℃ appeared not only in pure magnesium but also in its.

The effect of five typical heat treatment technologies on the damping properties and the damping peak of the SiCP/6061Al MMC, fabricated by spray atomization and deposition, was studied.

Furthermore, relaxation damping peaks appearing in every heat treated sample were analyzed, the relevant activation energies were also calcula.

The dynamic mechanical studies for two miscible polymer systems PEO/PMMA and SAN/PMMA showed that, just as expected, the glass transition temperature T g values, the height of α internal friction peak, and the temperature dependence of relaxation time of all the blends were between the neat components, and had a strong component dependence.

Experimental results show that,with increasingof Mg content,the width and relaxation strength of grain boundary internal friction peak de-crease monotonously,the peak position shifts to high temperatures at low Mg content andthen moves back to low temperature;quenching from high-temperature can suppress the grainboundary peak of Al-2.