Unusual irradiation-induced disordering in Cu3Au near the critical temperature: An in situ study using electron diffraction

Calvin Robert Lear, Robert S. Averback, Pascal Bellon, Andrea E. Sand, Marquis A. Kirk

Research output: Contribution to journalArticlepeer-review


Atomic mixing by replacement collision sequences and other cascade effects is well known to create chemical disorder in irradiated alloys. Most studies of irradiation-induced disordering have focused on ex situ analysis of irradiated samples; however, fast in situ techniques are necessary to measure disordering at elevated temperatures without significant interference from concurrent re-ordering processes. In the present work, we use in situ electron diffraction with high speed data collection to measure the initial change in the long-range order parameter S with ion dose φ during 500 keV Ne+ irradiation of Cu3Au foils. The data reveal an unexpected and dramatic increase in the disordering rate as the critical order-disorder transition temperature TC is approached. Molecular dynamics simulations show that this increase is not due to temperature-dependent cascade mixing. We attribute the enhanced disordering, instead, to coupling between point defect fluxes and the chemical state of order.

Original languageEnglish (US)
Pages (from-to)3841-3848
Number of pages8
JournalJournal of Materials Research
Issue number22
StatePublished - Nov 28 2018


  • defects
  • radiation effects
  • transmission electron microscopy (TEM)

ASJC Scopus subject areas

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

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