Positron annihilation spectroscopy study of defects in hydrogen loaded Zr-1Nb alloy

Iurii Bordulev, Viktor Kudiiarov, Leonid Svyatkin, Maxim Syrtanov, Ekaterina Stepanova, Jakub Čížek, Marian Vlček, Ke Li, Roman Laptev, Andrey Lider

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The purpose of this work is to implement the positron lifetime and Doppler broadening techniques for the study of hydrogen-induced defects in Zr–1wt% Nb (hereinafter Zr–1Nb) alloy. It was shown that spark cutting is an appropriate instrument to obtain a pair of Zr-1Nb samples with the same hydrogen content for the “sandwich” geometry and does not introduce open-volume defects in them during the cut. The ab-initio calculations were implemented to evaluate the positron annihilation characteristics for expanded crystal lattice, Zr with absorbed hydrogen, Zr-vacancy and Zr-vacancy-hydrogen complexes. The type of defects created in Zr-1Nb alloy loaded with hydrogen from the gas phase up to various hydrogen concentrations was studied. The main types of defects induced by hydrogen loading are vacancy-hydrogen complexes and dislocations. The processes of crystal lattice expansion and hydrogen dissolution in the lattice were studied.

Original languageEnglish
Pages (from-to)685-694
Number of pages10
JournalJournal of Alloys and Compounds
Volume798
DOIs
Publication statusPublished - 25 Aug 2019

Keywords

  • Hydrogen loading
  • Hydrogen-induced defects
  • Positron annihilation
  • Positron spectroscopy
  • Zirconium

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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