Anelastic relaxation due to O-H pairs in Nb-Zr alloys

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. The stress-induced ordering of H atoms around the interstitial oxygen atoms near the niobium matrix atoms is observed. This relaxation proc...

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Published inJournal of alloys and compounds Vol. 211/212; pp. 226 - 228
Main Authors Grandini, C R, Filho, W J B, Florencio, O, Tejima, H, Jordao, J A R
Format Journal Article
LanguageEnglish
Published 06.09.1993
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Summary: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. The stress-induced ordering of H atoms around the interstitial oxygen atoms near the niobium matrix atoms is observed. This relaxation process is studied by measuring the attenuation of longitudinal ultrasonic waves. These measurements were made in Nb-1.0Zr polycrystalline alloys at 10-30 MHz, pure and doped with 0.7 and 4.2 at.% H. The results revealed a thermally activated relaxation structure approx202-235K for 10 MHz and 30 MHz, respectively. This relaxation structure increases with increasing H concentration.
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ISSN:0925-8388