A positron lifetime study of defect recovery in electron irradiated Zircaloy-2 and Zr-2.5 Nb
- 1. Materials Dept., Riso National Lab., Roskilde (Denmark)
- 2. Reactor Materials Research Branch, AECL Chalk River Labs., Ontario (Canada)
Description
Positron lifetime measurements as a function of isochronal annealing are reported for electron irradiated Zircaloy-2 (Zy) and Zr-2.5 Nb (ZN). The electron irradiations, 1.3 MeV to a fluence of ≅ 1.4 X 1021/m2, were done at 85 K. As irradiated, the specimens have a long lifetime (τ2 = 215 - 225 ps) typical of a vacancy-trapped state. Annealing to 200 - 230 K reduces τ2, this is associated with Fe-vacancy complexing. Large parameter variations are found at higher temperatures for ZN but much less so for Zy: above 230 K the ZN data reveal a remarkable four-fold increase in trapping rate. Variations in τ2 and trapping rate with specimen temperature indicate trapping in more than one type of defect in spite of consistency with the ''one-trap'' trapping model
Additional details
Publishing Information
- Publisher
- Trans Tech Publ.
- Imprint Place
- Aedermannsdorf (Switzerland)
- ISBN
- 0-87849-636-X
- Imprint Title
- Positron annihilation. Proceedings
- Imprint Pagination
- 690 p.
- Journal Volume
- 105-110
- Journal Issue
- pt.2
- Series
- Materials science forum.
- Journal Page Range
- p. 997-1000.
Conference
- Title
- 9. international conference on positron annihilation (ICPA-9).
- Dates
- 26-31 Aug 1991.
- Place
- Szombathely (Hungary).
INIS
- Country of Publication
- Switzerland
- Country of Input or Organization
- Switzerland
- INIS RN
- 24052483
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ANNEALING; ANNIHILATION; CRYSTAL DEFECTS; ELECTRON BEAMS; ELECTRONS; LIFETIME; MEV RANGE 01-10; NIOBIUM ALLOYS; PHYSICAL RADIATION EFFECTS; POSITRONS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K; TRAPPING; VACANCIES; ZIRCONIUM BASE ALLOYS
- Descriptors DEC
- ALLOYS; ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BEAMS; CRYSTAL STRUCTURE; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; HEAT TREATMENTS; INTERACTIONS; LEPTON BEAMS; LEPTONS; MATTER; MEV RANGE; PARTICLE BEAMS; PARTICLE INTERACTIONS; POINT DEFECTS; RADIATION EFFECTS; TEMPERATURE RANGE; ZIRCONIUM ALLOYS