Abstract
The Gorsky Effect was investigated by internal friction measurements in the Nb-46 wt.% Ti-H system. The internal friction measurements were performed in a torsion pendulum with frequency of 3.8 Hz in a temperature range from 80 to 700 K. An interpretation of the experimental data showed that the hydrogen diffusion coefficient D obeys the Arrhenius' law in the temperature interval of 300 to 700 K, with D0 = 7.4 × 10-4 cm²/s and activation energy E = (0.102 ± 0.005) eV. At low temperatures, Do and E were found to be respectively 2.0 × 10-4 cm²/s and (0.063 ± 0.005) eV, with a deviation of the Arrhenius law of higher temperatures.
Highlights
IntroductionThe diffusion coefficient for interstitial solutes in metallic systems is determined accurately by Elastic After Effect relaxation measurements, i.e., internal friction, ultrasonic attenuation and acoustic wave dispersion[1,4]
The diffusion coefficient for interstitial solutes in metallic systems is determined accurately by Elastic After Effect relaxation measurements, i.e., internal friction, ultrasonic attenuation and acoustic wave dispersion[1,4].The relaxation by diffusion is based in the lonely condition that the strain field produced by the applied stress causes expansion or/and contraction in the crystalline lattice
The diffusion relaxation time τ is directly proportional to the square of the diameter of the sample and inversely proportional to the diffusion coefficient D
Summary
The diffusion coefficient for interstitial solutes in metallic systems is determined accurately by Elastic After Effect relaxation measurements, i.e., internal friction, ultrasonic attenuation and acoustic wave dispersion[1,4]. The inhomogeneous tension causes compression that give origin to the Gorsky Effect, that is, the G modulus isn’t only torsional and it must have a compression component. The Gorsky Effect due to hydrogen and deuterium longrange diffusion in niobium and vanadium was obtained by elastic after effect and internal friction measurements[4,6]. The great majority of the Nb-Ti superconductors industrially produced uses the Nb-46 wt.% Ti alloy as base material, whose fusion process, of high cost, require precise quality control to prevent the development of composition gradients. The pre-exponential factors and activation energies of hydrogen in this alloy was found and interpolated over a wide temperature range
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