Investigating the thermal stability of irradiation-induced damage in a zirconium alloy with novel in situ techniques

M. Topping, T. Ungár, C. P. Race, A. Harte, A. Garner, F. Baxter, S. Dumbill, P. Frankel, M. Preuss

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

Zr alloys exhibit irradiation-induced growth and hardening which is associated with the defects and dislocation loops that form during irradiation. In this study, state-of-the-art in-situ synchrotron X-ray diffraction (SXRD) and transmission electron microscopy (TEM) techniques were used to investigate the stability of dislocation loops in two proton-irradiated Zr-Fe binary alloys in real time. Complementary data from both techniques show rapid annealing of a-loops occurs between 300 °C and 450 °C. Line profile analysis was performed on the SXRD patterns using the convoluted multiple whole profile analysis tool, to calculate the change in a-loop line density as a function of post-irradiation heat treatment temperature and time. At temperatures below 300 °C, no significant decrease in a-loop density was detected when held for 1 h at temperature. From this SXRD experiment, we calculate the effective activation energy for the annealing process as 0.46 eV. On-axis in-situ STEM imaging was used to directly observe a-loop mobility during heating cycles and confirm that a-loops begin to glide in the trace of the basal plane at ∼200 °C in a thin foil specimen. Such a-loop gliding events, leading to annihilation at the foil's surfaces, became more frequent between 300 and 450 °C.

Original languageEnglish
Pages (from-to)255-263
Number of pages9
JournalActa Materialia
Volume145
DOIs
Publication statusPublished - 15 Feb 2018
Externally publishedYes

Keywords

  • Annealing
  • Dislocations
  • In situ
  • Line profile analysis
  • Zirconium

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