Neutron damage in reactor pressure-vessel steel examined with positron annihilation lifetime spectroscopy

Stephen E. Cumblidge, Arthur Thompson Motta, Gary L. Catchen

Research output: Contribution to journalConference article

3 Scopus citations

Abstract

We have used positron annihilation lifetime spectroscopy to study the development of damage and annealing behavior of neutron-irradiated reactor pressure-vessel steels. We irradiated samples of ASTM A508 nuclear reactor pressure-vessel steel to fast neutron fluences of up to 1017 n/cm2, and we examined these samples using positron annihilation lifetime spectroscopy (PALS) to study the effects of neutron damage in the steels on positron lifetimes. Non-irradiated samples show two positron lifetimes: a 110 ps component corresponding to annihilations in the bulk material, and a 165 ps lifetime corresponding to annihilations in dislocation defects. The irradiated samples show an additional lifetime component of 300 ps in the PAL spectra and an increase in the proportion of annihilations with a 165 ps lifetime, suggesting that vacancies and vacancy clusters are present in the material after room temperature irradiation. The samples were then annealed to temperatures ranging from 210 °C to 450 °C. The positron lifetimes introduced by neutron damage disappear after annealing the samples at 280 °C.

Original languageEnglish (US)
Pages (from-to)483-488
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume439
StatePublished - Jan 1 1997
EventProceedings of the 1996 MRS Fall Symposium - Boston, MA, USA
Duration: Dec 2 1996Dec 5 1996

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Neutron damage in reactor pressure-vessel steel examined with positron annihilation lifetime spectroscopy'. Together they form a unique fingerprint.

  • Cite this