Diffusivity and solubility of Cu in a reactor pressure vessel steel studied by atom probe tomography

Masaki Shimodaira, Takeshi Toyama, Fumihiko Takahama, Naoki Ebisawa, Yasuko Nozawa, Yasuo Shimizu, Koji Inoue, Yasuyoshi Nagai

Research output: Contribution to journalArticlepeer-review


The diffusivity and solubility limit of Cu in A533B steel, which is used in reactor pressure vessels, were studied by atom probe tomography (APT). Cu-A533B steel diffusion couples were annealed at temperatures of 550, 600, and 700°C, and the resulting Cu concentration profiles were measured. For all annealing temperatures, the diffusivity of Cu in A533B steel were found to be 2-3 times higher than that in pure Fe, although the solubility limit of Cu was similar. APT was also used to study the effect of the grain boundary (GB) diffusion. The results indicated that no Cu segregation occurred at GB near the Cu/A533B steel interface, which may imply that GB diffusion of Cu was not effective in A533B steel.

Original languageEnglish
Pages (from-to)1460-1463
Number of pages4
JournalMaterials Transactions
Issue number9
Publication statusPublished - 2014


  • Atom probe tomography
  • Copper diffusion
  • Diffusivity
  • Grain boundary diffusion
  • Reactor pressure vessel steel
  • Solubility limit

ASJC Scopus subject areas

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


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