Abstract
An apparatus has been developed in which the resonant frequencies of thin prismatic bars can be measured in vacuum over a wide temperature range. This has been used to measure the Young's modulus, shear modulus and internal friction of the following materials: Hypostoichiometric UC, Young's modulus, shear modulus and internal friction to 725 °C. Hyperstoichiometric UC, Young's modulus and internal friction to 1350 °C. Stoichiometric UC 2, Young's modulus, shear modulus and internal friction to 1250 °C. UN, Young's modulus and internal friction to 1420 °C. It is concluded that the temperatures at which the Young's modulus-temperature curves begin to deviate from linearity correspond to the lowest temperatures at which plastic deformation can take place. The values for the materials tested are: hypo. UC, 600 °C; hyper. UC, 1000 °C; UO 2.00, 1000 °C; and UN, 1200 °C. It is suggested that the peaks found in the internal friction spectra are attributable to grain boundary relaxation processes.
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