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MATERIAL SCIENCE
ArticleName Influence of high-temperature oxidation on structural and textural peculiarities of cladding pipes, made of Zr – 1% Nb alloy
DOI 10.17580/tsm.2015.07.11
ArticleAuthor Perlovich Yu. A., Isaenkova M. G., Fesenko V. A., Medvedev P. N.
ArticleAuthorData

National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute), Moscow, Russia:

Yu. A. Perlovich, Professor, e-mail: yuperl@mail.ru
M. G. Isaenkova, Professor
V. A. Fesenko, Researcher
P. N. Medvedev, Engineer

Abstract

X-ray diffractometric methods investigated the cladding pipes, made of Zr – 1%Nb alloy, manufactured from spongy and electrolytic zirconium and oxidized at high temperature (1100 оC). The layer-by-layer study of oxide phase composition was investigated together with structural and textural peculiarities of pipe layers, adjacent to oxidation zone. According to the enterprise-adopted criteria, preliminary recrystallization of both pipes is complete. The whole deformed matrix is replaced by newly formed recrystallized grains. However, the size of these grains can be significantly varied, depending on the density of recrystallization nucleus distribution and their growth rate, certainly differing in alloys, based on spongy and electrolytic zirconium. A number of X-ray data testifies, that recrystallization of investigated pipes proceeds in different manners, with formation of new different size grains. The defined difference in recrystallized grain sizes is critical for the pipe completeness with high-temperature oxidation. Electrolytic zirconium pipe destruction is connected with prevalence of tetragonal phase in its oxide layer. This is explained by intense diffusion of oxygen into pipe wall, subjected to recrystallization with final thermal treatment with formation of more fine-grain structure, than spongy zirconium pipe.

keywords Zr – 1% Nb alloy, cladding pipes, high temperature oxidation, phase composition, texture, recrystallization, oxygen stabilized layer
References

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