Shear modulus and internal friction in a Cu-0.17% Zr alloy and pure copper subjected to equal-channel angular pressing

The effect of temperature on the shear modulus and low-frequency internal friction of pure copper and a Cu-0.17 wt % Zr alloy subjected to equal channel angular pressing (ECAP) is studied in the temperature range 100–550 K. In both materials, ECAP significantly decreases the shear modulus. It is found that the temperature dependences of the shear modulus of the alloy and pure copper are qualitatively similar and those of the internal friction are markedly different. Possible mechanisms responsible for the anomalous behavior of the elastic moduli and internal friction in the materials subjected to ECAP are discussed.