| Abstract Scope |
The elastic stiffness coefficients of spark plasma sintered (SPS) and hot isostatic pressed (HIP) Ti6242-Ti4822 composites, containing various amounts of Ti4822, have been measured from room temperature up to 800 °C, using the resonant ultrasound spectroscopy (RUS) technique. These data were used to calculate Poisson’s ratio, bulk modulus, Young's modulus, and shear modulus. The elastic moduli and Poisson's ratio for the polycrystalline materials, calculated by the Hill averaging scheme, are in good agreement with the experimental data, provided all the constituent phases are taken into account. Interestingly, a large, greater than expected, discrepancy between the static moduli measured using standard mechanical testing and the dynamic moduli measured using RUS is observed, especially, for composites with intermediate Ti4822 contents. To explain this observed lower static moduli, the contributions from mechanical damping, microplasticity, composite effects, and dislocation-induced effects are considered. |