Effect of hydrogen on generation of lattice defects in shock-loaded Pd

Oksana Melikhova, Jakub Čížek, Yuzeng Chen, Tao Suo, Ivan Procházka, Feng Liu

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3 Scopus citations

Abstract

The effect of hydrogen absorbed in fcc Pd lattice on the generation of dislocations and vacancies during plastic deformation by shock-loading was investigated in this work. Well annealed bulk Pd samples were firstly charged with hydrogen up to various hydrogen concentrations. Subsequently the samples were shock-loaded on a Split-Hopkinson apparatus. Shock-loading yields extremely high strain rate and causes intensive plastic deformation of the samples. Lattice defects of the shock-loaded samples were characterized by positron lifetime spectroscopy combined with X-ray diffraction. It was found that shock-loaded Pd samples exhibit not only high density of dislocations but also small vacancy clusters created by agglomeration of deformation-induced vacancies. Pre-charging of Pd samples with hydrogen increases both the dislocation density and the concentration of vacancy clusters.

Original languageEnglish
Pages (from-to)S472-S475
JournalJournal of Alloys and Compounds
Volume645
Issue numberS1
DOIs
StatePublished - 11 Aug 2015

Keywords

  • Defects
  • Hydrogen
  • Palladium
  • Plastic deformation
  • Positron annihilation

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