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Dislocations and radiation damage in {alpha}-uranium; Dislocations et effets des radiations dans l'uranium {alpha}

Abstract

Dislocations in {alpha}-uranium were studied by electron microscopy. Electropolishing of thin foils was performed at low temperature (-110 deg. C) to prevent oxidation. Burgers vectors of twins dislocations are defined. Interactions between slip and twinning are studied from both experimental and theoretical point of view. Samples irradiated at several burn-up were examined. In order to explain our micrographic results, and also all information gathered in literature about radiation damage in {alpha}-uranium, a coherent model is propound for the fission particles effects. We analyse the influences of parameters: temperature, dislocation density, impurity content. The number of point defects created by one initial fission is determined for pure and annealed metal. The importance of the self-anneal which occurs immediately in each displacement spike, and the anneal due to a new fission on the damage resulting from a previous fission, are estimated. The focussing distance in [100] direction is found to be about 1000 Angstrom, at 4 deg. K. (author) [French] Ce travail est une etude par microscopie electronique des dislocations induites dans l'uranium {alpha}, soit par deformation plastique, soit par irradiation. Une methode de preparation des lames minces a basse temperature (-110 deg. C) a ete mise au point. Les vecteurs de  More>>
Authors:
Leteurtre, J [1] 
  1. Commissariat a l'Energie Atomique, 92 - Fontenay-Aux-Roses (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1968
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-3607
Resource Relation:
Other Information: TH: These docteur es sciences physiques; 138 refs; PBD: Jul 1968
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; ANNEALING; ATOMIC DISPLACEMENTS; BURGERS VECTOR; BURNUP; COALESCENCE; DEFORMATION; DOSE-RESPONSE RELATIONSHIPS; ELECTRON MICROSCOPY; FISSION FRAGMENTS; FRENKEL DEFECTS; GRAIN GROWTH; IMPURITIES; INTERSTITIALS; IRRADIATION; ORTHORHOMBIC LATTICES; SCREW DISLOCATIONS; STACKING FAULTS; TEMPERATURE DEPENDENCE; TWINNING; URANIUM-ALPHA
OSTI ID:
20523390
Research Organizations:
CEA Fontenay-aux-Roses, 92 (France); Faculte des Sciences d'Orsay, Universite de Paris, 91 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR04R3607091445
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[147] pages
Announcement Date:

Citation Formats

Leteurtre, J. Dislocations and radiation damage in {alpha}-uranium; Dislocations et effets des radiations dans l'uranium {alpha}. France: N. p., 1968. Web.
Leteurtre, J. Dislocations and radiation damage in {alpha}-uranium; Dislocations et effets des radiations dans l'uranium {alpha}. France.
Leteurtre, J. 1968. "Dislocations and radiation damage in {alpha}-uranium; Dislocations et effets des radiations dans l'uranium {alpha}." France.
@misc{etde_20523390,
title = {Dislocations and radiation damage in {alpha}-uranium; Dislocations et effets des radiations dans l'uranium {alpha}}
author = {Leteurtre, J}
abstractNote = {Dislocations in {alpha}-uranium were studied by electron microscopy. Electropolishing of thin foils was performed at low temperature (-110 deg. C) to prevent oxidation. Burgers vectors of twins dislocations are defined. Interactions between slip and twinning are studied from both experimental and theoretical point of view. Samples irradiated at several burn-up were examined. In order to explain our micrographic results, and also all information gathered in literature about radiation damage in {alpha}-uranium, a coherent model is propound for the fission particles effects. We analyse the influences of parameters: temperature, dislocation density, impurity content. The number of point defects created by one initial fission is determined for pure and annealed metal. The importance of the self-anneal which occurs immediately in each displacement spike, and the anneal due to a new fission on the damage resulting from a previous fission, are estimated. The focussing distance in [100] direction is found to be about 1000 Angstrom, at 4 deg. K. (author) [French] Ce travail est une etude par microscopie electronique des dislocations induites dans l'uranium {alpha}, soit par deformation plastique, soit par irradiation. Une methode de preparation des lames minces a basse temperature (-110 deg. C) a ete mise au point. Les vecteurs de Burgers des diverses dislocations de macles de ce metal ont ete definis. Les interactions glissements- maclages sont etudiees experimentalement et theoriquement. Des echantillons irradies a divers taux de combustion ont ete examines. Pour expliquer nos resultats micrographiques, et aussi l'ensemble des informations recueillies dans la litterature concernant l'endommagement par irradiation de l'uranium-{alpha}, nous proposons un modele coherent de l'effet des fragments de fission dans ce metal. L'influence des parametres: temperature, densite de dislocations, impuretes est analysee. Le nombre de defauts ponctuels crees par une fission dans du metal pur et recuit est determine; l'importance de l'autorecuit immediat dans chaque cascade de deplacement, et celle du recuit d'une fission sur les degats d'une fission anterieure sont estimees. Enfin, la distance de focalisation dans la direction [100] est trouvee egale a 1000 Angstroem, a 4 deg. K. (auteur)}
place = {France}
year = {1968}
month = {Jul}
}