Abstract
The temperature effect of anisotropic elastic constants and mechanical damping factors(Q-1) of Zr-2.5Nb pressure tube materials were determined by a high temperature resonant ultrasound spectroscopy(RUS). Resonance frequencies were measured using a couple of graphite waveguides and wide-band ultrasonic transducers into a small furnace. A nine elastic stiffness tensor for the orthorhombic symmetry was determined in the range of room temperature ~400°C. Higher elastic constants along the transverse direction compared to those along the axial or radial direction are similar to the case of Young’s modulus or shear modulus. A crossing of elastic constants along axial direction and radial direction was observed near 120°C. Higher Q-1 in the temperature range of 100 ~220°C was observed. Those Q-1 values increase as the hydrogen concentrations increase. The deviation of resonance frequency to temperature (dfr/dT) shows a minima at a certain temperature and this fact could correspond to the terminal solid solubility for dissolution(TSSD) of hydrogen.
Published Version
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