Positron trapping defects in Pt, Al, and Al-0. 1-at. % Mg following d-Be neutron irradiation
Conference
·
OSTI ID:6199025
Specimens of Al, Al--Mg, and Pt were irradiated using the Davis d-Be neutron source which has a spectrum peaking at approx. 15 MeV. Lifetime and Doppler-broadening measurements have been made on these specimens for three fluences in the as-irradiated state and for subsequent anneals to 500/sup 0/C. Saturation of positron trapping at the higher fluences was observed in the Pt specimen, with the average trap size increasing after annealing through stage III (vacancy migration). Surviving traps after 500/sup 0/C are presumed to be voids. The Al and Al--Mg showed some trapping introduced by the room-temperature irradiaion, but complete recovery is seen at 500/sup 0/C. These trapping sites are assumed to be small vacancy clusters or small dislocation loops. Some loops of very low concentration were observed near grain boundaries in the as-irradiated specimen of Al by TEM.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA); AN SSSR, Moscow. Inst. Metallurgii; California Univ., Livermore (USA). Lawrence Livermore Lab.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- EY-76-C-02-0016
- OSTI ID:
- 6199025
- Report Number(s):
- BNL--26183; CONF-790437--12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700201 -- Fusion Power Plant Technology-- Blanket Engineering
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
ANNEALING
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DAMAGE
DISLOCATIONS
DOPPLER BROADENING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HEAT TREATMENTS
INTERACTIONS
LEPTONS
LIFETIME
LINE BROADENING
LINE DEFECTS
MAGNESIUM ALLOYS
METALS
PHYSICAL RADIATION EFFECTS
PLATINUM
PLATINUM METALS
POINT DEFECTS
POSITRONS
RADIATION EFFECTS
TEMPERATURE DEPENDENCE
THERMONUCLEAR REACTOR MATERIALS
THERMONUCLEAR REACTORS
TRANSITION ELEMENTS
TRAPPING
VACANCIES
VOIDS
360106* -- Metals & Alloys-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700201 -- Fusion Power Plant Technology-- Blanket Engineering
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
ANNEALING
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DAMAGE
DISLOCATIONS
DOPPLER BROADENING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HEAT TREATMENTS
INTERACTIONS
LEPTONS
LIFETIME
LINE BROADENING
LINE DEFECTS
MAGNESIUM ALLOYS
METALS
PHYSICAL RADIATION EFFECTS
PLATINUM
PLATINUM METALS
POINT DEFECTS
POSITRONS
RADIATION EFFECTS
TEMPERATURE DEPENDENCE
THERMONUCLEAR REACTOR MATERIALS
THERMONUCLEAR REACTORS
TRANSITION ELEMENTS
TRAPPING
VACANCIES
VOIDS