Affiliation:
1. Universidade Federal de São Carlo
2. Universidade Federal de São Carlos
3. Universidade Federal de São Carlos (UFSCar)
4. Faculdade de Engenharia Quimica de Lorena
Abstract
Anelastic relaxation measurements have been used in order to obtain information about
several aspects of the behavior of solutes in metals, for example, matrix-solute interaction,
interstitial diffusion, etc. The diffusion coefficient for interstitial solutes in body centered-cubic
metals is accurately determined by anelastic relaxation measurements. The kind of preferential
occupation of the interstitial solutes in body centered-cubic metals, such as oxygen and nitrogen in
tantalum, is still controversial. Internal friction and frequency measurements as a function of
temperature in tantalum sample were performed using a torsion pendulum operating in a frequency
oscillation in the hertz bandwidth. These results presented the following phenomenon: the intensity
of the internal friction peak decreased between the first run and the other runs. These results were
decomposed, by the successive subtraction method, in elementary Debye peaks, for determination of
characteristic anelastic relaxation parameters (relaxation strength, peak temperature, activation
energy and relaxation time). Interstitial diffusion coefficients for oxygen in tantalum were
determined, for different intensities of internal friction peaks, and when compared with literature,
these results introduced a better adjustment for the tetrahedral preferential occupation sites of
oxygen in tantalum.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Radiation
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