Abstract
Measurements of ultrasonic wave velocities in a polycrystalline directionally solidified nickel based eutectic alloy are used to evaluate the three independent single crystal elastic moduli at temperatures between 298 to 925 K. The Cu and C44 moduli are obtained directly from high frequency wave propagation along the D.S. axis, corresponding to . Evaluation of C12 requires measurements at lower frequencies to obtain (C11 −E ). The elastic anisotropy and temperature dependence of the elastic moduli are almost identical to those reported for pure Ni, indicating that neither TaC fiber reinforcement nor γ′ precipitate have strong effects on elastic properties of Ni based turbine blade alloys.
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