Anelastic relaxation due to OH pairs in NbZr alloys
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Data
1994-09-01
Autores
Grandini, Carlos Roberto [UNESP]
Botta Filho, Walter José
Florěncio, Odila
Tejima, Hiroshi
Rodrigues Jordão, JoséAlberto
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
In the last 30 years several studies have been made to understand the relaxation mechanisms of the hydrogen atoms present in transition metals and their alloys. In this work, we observed the stress-induced ordering of hydrogen atoms around the interstitial oxygen atoms near the niobium matrix atoms. We studied this relaxation process by measuring the attenuation of longitudinal ultrasonic waves. These measurements were made in Nb1.0%Zr polycrystalline alloys at 10 and 30 MHz, pure and doped with 0.7 and 4.2 at.% hydrogen. The results revealed a thermally activated relaxation structure around 202 K and 235 K for 10 MHz and 30 MHz respectively. This relaxation structure increases with increasing hydrogen concentration. © 1994.
Descrição
Palavras-chave
Anelastic relaxation, Annealing, Atoms, Attenuation, Crystalline materials, Doping (additives), Hydrogen, Internal friction, Oxygen, Stresses, Ultrasonic velocity measurement, Ultrasonic waves, Oxygen hydrogen pairs, Polycrystalline alloys, Ultrasonic wave attenuation, Vacuum annealing, Niobium alloys
Como citar
Journal of Alloys and Compounds, v. 211-212, n. C, p. 226-228, 1994.