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SUMMARY:APPLICATION OF SHORT-WAVE DIFFRACTION OF SYNCHROTRON RADIATION FOR
  IN-SITU INVESTIGATION OF ZIRCONIUM HYDRIDES FORMATION AT GAS-PHASE HYDROG
 ENATION
DTSTART;VALUE=DATE-TIME:20160705T090000Z
DTEND;VALUE=DATE-TIME:20160705T100000Z
DTSTAMP;VALUE=DATE-TIME:20260613T123734Z
UID:indico-contribution-1228@indico.inp.nsk.su
DESCRIPTION:Speakers: Maxim Syrtanov (National Research Tomsk Polytechnic 
 University\, Tomsk\, Russia)\nZirconium alloys are widely used as construc
 tion materials in an active zone of nuclear reactors. During operation of 
 such alloys in contact with a hydrogen-containing environment\, hydrogen p
 enetrates into them. This significantly influences on the physical\, chemi
 cal and mechanical properties of the material [1\,2]. To investigate the e
 ffect of hydrogen accumulation on the zirconium alloys properties is neces
 sary to prepare the experimental samples with different hydrogen concentra
 tions and different distribution. However\, the hydrogenation process can 
 be hampered by the presence of a thin oxide film on the samples surface\, 
 which is greatly effect on the hydrogen distribution by material volume. T
 he application of the nickel coating increases the hydrogen sorption rate.
  Also nickel has a high permeability to hydrogen. Moreover\, the nickel ox
 idation is less active than zirconium\, which contributes to hydrogen abso
 rption.\n\nIn this paper zirconium alloy (Zr1%Nb) samples with a micron-or
 der nickel layer were investigated. Hydrogenation was carried out by gas p
 hase method at temperatures of 350\, 450 and 550 ° C. Hydrogen pressure i
 n chamber was 1 atm. Hydrogen sorption curves were obtained on the automat
 ed complex Gas Reaction Controller. In situ diffraction measurements were 
 carried out in the process of hydrogen saturation of samples at the statio
 n "Precision diffractometry II» of the Institute of Catalysis of the Sibe
 rian Branch of the Russian Academy of Science at the 6 synchrotron radiati
 on channel of the VEPP-3 electron storage ring.\n \nComparison of the data
  obtained in the analysis of hydrogen sorption curves with data of the pha
 se transitions in the zirconium-hydrogen system at a gas phase hydrogenati
 on allowed describing the processes occurring in zirconium by hydrogenatio
 n at different temperatures. \n\n1. Silva K.-R.F.\, DosSantos D.S.\, Robei
 ro A.F.\, Almeida L.H. Hydrogen diffusivity and hydride formation in rich-
 zirconium alloys used in nuclear reactors // Defect and Diffusion Forum. 2
 010. Vol. 297- 301. P. 722-727.\n2. Zielinski A.\, Sobieszczyk S. Hydrogen
 -enhanced degradation and oxide effects in zirconium alloys for nuclear ap
 plication // Intern. Journ. of Hydrogen Energy.  2011. Vol. 36. P. 8619-86
 29.\n3. Kudiyarov V. N. \, Kashkarov E. B. \, Syrtanov M. S. \, Babikhina 
 M. N. \, Vlasov V. A. Investigation of hydrogenation parameters influence 
 on hydrogen sorption rate by Zr-1%Nb alloy with nickel layer // Извес
 тия вузов. Физика. - 2015 - Т. 58 - №. 9/3. - C. 20-23\n\
 nhttps://indico.inp.nsk.su/event/3/contributions/1228/
LOCATION:Budker INP 2nd and 3rd floors
URL:https://indico.inp.nsk.su/event/3/contributions/1228/
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