Defect annihilation in heavy ion irradiated polycrystalline gold

Zahabul Islam, Christopher M. Barr, Khalid Hattar, Aman Haque

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we explore the interaction of electron wind force (EWF) with defects originating from ion irradiation in-situ inside a transmission electron microscope. Nanocrystalline gold specimens were self-ion irradiated to a dose of 5 × 1015 ions/cm2 (45 displacement per atom) to generate a high density of displacement damage. We also developed a molecular dynamics simulation model to understand the associated atomic scale mechanisms. Both experiments and simulations show that the EWF can impart significant defect mobility even at low temperatures, resulting in the migration and elimination of defects in a few minutes. We propose that the EWF interacts with defects to create highly glissile Shockley partial dislocations, which makes the fast and low temperature defect annihilation possible.

Original languageEnglish (US)
Article number128694
JournalMaterials Letters
Volume282
DOIs
StatePublished - Jan 1 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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