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ArticleName Research of helium and hydrogen behavior in vanadium-based alloys
ArticleAuthor Aung Kyaw Zaw, Chernov I. I., Staltsov M. S., Kalin B. A., Korchagin O. N.

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

Aung Kyaw Zaw, Post-Graduate Student
I. I. Chernov, Professor, e-mail:
M. S. Staltsov, Assistant Professor
B. A. Kalin, Professor, Head of a Chair of Physical Problems of Material Science
O. N. Korchagin, Post-Graduate Student


Using a transmission electron microscope and gas analyzer RHEN-602, microstructure development peculiarities and hydrogen retention were investigated in vanadium-based alloys, depending on chemical composition and concentration of alloying elements in vanadium (V – Ti, V – Ta and V – W alloys). Samples were sequentially implanted by helium and hydrogen ions, and were saturated by hydrogen in autoclave without introduction of radiation defects. There was established the minimum amount of hydrogen at concentrations of few tenths of titanium weight percent for both methods of hydrogen introduction into V – Ti alloys. Amount of retained hydrogen is increased substantially with increasing of titanium concentration above 1% (wt.). Vanadium alloying by tantalum and tungsten decreases the amount of retained hydrogen in alloys by almost two times, in comparison with its capture by vanadium. High density of fine bubbles is formed from helium-vacancy complexes under irradiation with H+ ions of samples, implanted by He+ ions at 290 K. Irradiation by H+ ions of samples, implanted by He+ ions at 920 K, accompanied by helium porosity formation, leads to radiation-induced dissolution of some bubbles and growth of others in local volumes of samples. Thus, sequential introduction of helium and hydrogen, accompanied by helium bubbles formation, leads to increase of hydrogen retained amount. Obtained results may be useful in development of reactor structural vanadium alloys, as well as in evaluation of possibility of hydrogen embrittlement of vanadium alloys during operation in reactor conditions.

keywords Vanadium, vanadium-based alloys, helium, hydrogen, gas porosity, hydrogen retention

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