Abstract
A pulse-echo technique has been used to measure the temperature variation of the velocity of extensional and torsional acoustic waves in polycrystalline Nb(Cb), Ta, and V up to ∼2000 K. The concomitant temperature variation of the elastic moduli do not show any anomalies which would be consistent with a “lattice softening” theory for the departure from linearity of the Arrhenius plots for the diffusivity of interstitial atoms in the Group V metals.
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