Self-ion irradiation effects on nanoindentation-induced plasticity of crystalline iron: A joint experimental and computational study: Ion irradiation effects on hardening mechanisms of crystalline iron

K. Mulewska*, F. Rovaris, F. J. Dominguez-Gutierrez, W. Y. Huo, D. Kalita, I. Jozwik, S. Papanikolaou, M. J. Alava, L. Kurpaska, J. Jagielski

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

In this paper, experimental work is supported by multi-scale numerical modeling to investigate nanomechanical response of pristine and ion irradiated with Fe2+ ions with energy 5 MeV high purity iron specimens by nanoindentation and Electron Backscatter Diffraction. The appearance of a sudden displacement burst that is observed during the loading process in the load–displacement curves is connected with increased shear stress in a small subsurface volume due to dislocation slip activation and mobilization of pre-existing dislocations by irradiation. The molecular dynamics (MD) and 3D-discrete dislocation dynamics (3D-DDD) simulations are applied to model geometrically necessary dislocations (GNDs) nucleation mechanisms at early stages of nanoindentation test; providing an insight to the mechanical response of the material and its plastic instability and are in a qualitative agreement with GNDs density mapping images. Finally, we noted that dislocations and defects nucleated are responsible the material hardness increase, as observed in recorded load–displacement curves and pop-ins analysis.

Original languageEnglish
Pages (from-to)55-61
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume539
DOIs
Publication statusPublished - Jun 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • 3D-DDD simulations
  • Dislocation dynamics
  • Irradiation damage
  • MD simulations
  • Nanoindentation

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