Hydrogen suppression of dislocation cell formation in micro and nano indentation of pure iron single crystals

Peng Gong, Ivaylo Katzarov, John Nutter, Anthony T. Paxton, Bradley Wynne, W. Mark Rainforth*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The influence of hydrogen on dislocation mobility in pure single crystal iron subjected to micro- and nanoindentation testing perpendicular to the (100) plane has been analysed using electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM) and simulated using the self-consistent kinetic Monte-Carlo (SCkMC) method. The nanoindentation load curve for the hydrogen free sample has two major constant load pop-ins, and multiple smaller pop-ins, whereas the hydrogen charged material has only one pop-in but with a longer loading release. A well-defined cell structure was observed below the indenter in the hydrogen free condition, but the dislocations were homogenously distributed in the hydrogen charged sample. The SCkMC simulations showed that it is difficult for dislocations to glide out of the primary slip plane after hydrogen charging compared with the hydrogen free sample under the present loading conditions.

Original languageEnglish
Article number113683
JournalSCRIPTA MATERIALIA
Volume194
DOIs
Publication statusPublished - 15 Mar 2021

Keywords

  • hydrogen induced softening
  • micro- and nanoindentation
  • Pure iron single crystal
  • self-consistent kinetic Monte-Carlo (SCkMC) simulations

Fingerprint

Dive into the research topics of 'Hydrogen suppression of dislocation cell formation in micro and nano indentation of pure iron single crystals'. Together they form a unique fingerprint.

Cite this