Low-temperature internal friction of fiber composites with a copper matrix

The temperature dependences of the internal friction and shear modulus of composites with a copper matrix reinforced with fibers of different functional purposes (Cu, Fe, Al, NbTi) have been studied in the temperature range of 100–300 K. The internal friction demonstrates a peak located in a narrow temperature range and caused by a thermally activated relaxation process. It has been shown that its behavior is due to a number of technological factors whose combination determines the strength of adhesive bond of the composite components. The observed fact makes it possible to use the internal friction as a nondestructive method of controlling the adhesion strength of a fiber-matrix compound.