Viscoelastic Procedure for the Analysis of Internal Friction Peaks in High Purity Molybdenum

C. L. MATTEO; O. A. LAMBRI; G. I. ZELADA-LAMBRI; P. A. SORICHETTI; J. A. GARCÍA

San Nicolás, Pcia. de Buenos Aires

Congreso; Congreso SAM/CONAMET 2007; 2007

Asociacíon Argentina de Materiales (SAM) y CONAMET

Experimental data from relaxation damping peaks in deformed molybdenum at high temperatures are adequately described by a Havriliak-Negami (HN) function. The analysis reveals that for the relaxation peak appearing at temperatures below 900K, the physical mechanism is controlled by a vacancy-diffusion-controlled movement of dislocations. In contrast, when the peak appears at temperatures higher than 900K, the damping is controlled by a mechanism of diffusion in the low-temperature tail of the peak, and in the high temperature tail of the peak the creation plus diffusion of vacancies at the dislocation line occurs.