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Contribution to the study of the textures of uranium rods prepared by sintering-extrusion, and their consequences on the thermal cycling behaviour; Contribution a l'etude des textures de barreaux d'uranium mis en forme par frittage-extrusion et leurs consequences sur le comportement au cyclage thermique

Abstract

Uranium rods prepared by sintering-extrusion in the {alpha} or {beta} phase (at various extrusion ratios) using slightly oxidised powders have been subjected to the thermal cycling test. At the same time, dilatometric and X-ray techniques have made it possible to determine the structures produced in these materials during their fabrication. A relationship is then proposed linking the texture to the increase in length on thermal cycling. 1. Two types of rods have been studied: Sintered-extruded in the {beta} phase: low density (88 per cent theoretical density), large grain-size and no preferential texture. Sintered-extruded in the {alpha} phase: high density (96 per cent theoretical density), fine grain with pronounced preferential texture. 2. After 1000 thermal cycles between 20 and 550 C, the increases in length are the following: 2 per cent for a uranium sintered-extruded in the {beta} phase (with surface cracking). between 14 and 56 per cent according to the extrusion ratio for on uranium sintered-extruded in the {alpha} phase (with no surface effects). 3. In the case of rods sintered-extruded in the {alpha} phase, determination of the pole figure using the Schulz reflection method showed the existence of two preferential orientations parallel to the direction of extrusion: one close  More>>
Authors:
Peix, J [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Nov 01, 1964
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-2972
Resource Relation:
Other Information: TH: These sciences; PBD: Nov 1964
Subject:
36 MATERIALS SCIENCE; DILATOMETRY; EXTRUSION; RODS; SCHULZ METHOD; SINTERING; TEXTURE; THERMAL CYCLING; URANIUM
OSTI ID:
20621971
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France); Faculte des Sciences de l'Universite de Paris, 75 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2972065622
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[73] pages
Announcement Date:

Citation Formats

Peix, J. Contribution to the study of the textures of uranium rods prepared by sintering-extrusion, and their consequences on the thermal cycling behaviour; Contribution a l'etude des textures de barreaux d'uranium mis en forme par frittage-extrusion et leurs consequences sur le comportement au cyclage thermique. France: N. p., 1964. Web.
Peix, J. Contribution to the study of the textures of uranium rods prepared by sintering-extrusion, and their consequences on the thermal cycling behaviour; Contribution a l'etude des textures de barreaux d'uranium mis en forme par frittage-extrusion et leurs consequences sur le comportement au cyclage thermique. France.
Peix, J. 1964. "Contribution to the study of the textures of uranium rods prepared by sintering-extrusion, and their consequences on the thermal cycling behaviour; Contribution a l'etude des textures de barreaux d'uranium mis en forme par frittage-extrusion et leurs consequences sur le comportement au cyclage thermique." France.
@misc{etde_20621971,
title = {Contribution to the study of the textures of uranium rods prepared by sintering-extrusion, and their consequences on the thermal cycling behaviour; Contribution a l'etude des textures de barreaux d'uranium mis en forme par frittage-extrusion et leurs consequences sur le comportement au cyclage thermique}
author = {Peix, J}
abstractNote = {Uranium rods prepared by sintering-extrusion in the {alpha} or {beta} phase (at various extrusion ratios) using slightly oxidised powders have been subjected to the thermal cycling test. At the same time, dilatometric and X-ray techniques have made it possible to determine the structures produced in these materials during their fabrication. A relationship is then proposed linking the texture to the increase in length on thermal cycling. 1. Two types of rods have been studied: Sintered-extruded in the {beta} phase: low density (88 per cent theoretical density), large grain-size and no preferential texture. Sintered-extruded in the {alpha} phase: high density (96 per cent theoretical density), fine grain with pronounced preferential texture. 2. After 1000 thermal cycles between 20 and 550 C, the increases in length are the following: 2 per cent for a uranium sintered-extruded in the {beta} phase (with surface cracking). between 14 and 56 per cent according to the extrusion ratio for on uranium sintered-extruded in the {alpha} phase (with no surface effects). 3. In the case of rods sintered-extruded in the {alpha} phase, determination of the pole figure using the Schulz reflection method showed the existence of two preferential orientations parallel to the direction of extrusion: one close to [100], the other close to [110]. By dilatometry it was then possible to measure quantitatively the proportion of each constituent in the overall texture and to show that an increase in the percentage of [100] occurs with increasing amounts of cold-working. 4. Finally, by comparing 2 and 3 it can be seen that the increases in length due to thermal cycling are connected to the percentage amounts of each component. It seems that the increases in length diminish as the percentage of [100] increases. On the other hand the behaviour of materials containing large amount of [110] is still far from clear. (author) [French] Des barreaux d'uranium realises par frittage-extrusion en phase {alpha} ou {beta} (a divers taux d'extrusion), a partir de poudre legerement oxydee, ont ete soumis a l'epreuve du cyclage thermique. Parallelement, les techniques de dilatometrie et de rayons X ont permis de determiner les textures engendrees dans ces materiaux lors de leur elaboration. Une relation est alors proposee entre texture et allongement par cyclage thermique. 1. Deux types de barreaux ont ete etudies: Frittes-extrudes en phase {beta}: faible densite (88 pour cent densite theorique), gros grains et absence de texture preferentielle; Frittes-extrudes en phase {alpha}: forte densite (96 pour cent densite theorique), grains fins et texture preferentielle prononcee. 2. Apres 1000 cycles thermiques entre 20 C et 550 C les allongements sont les suivants: 2 pour cent pour un uranium fritte-extrude en phase {beta} (avec fissuration de surface); entre 14 et 56 pour cent suivant le taux d'extrusion, pour un uranium fritte-extrude en phase {alpha} (sans alteration de surface). 3. Dans le cas des barreaux frittes-extrudes en phase {alpha} la determination des figures de poles, par la methode de Schulz en reflexion a fait apparaitre deux orientations preferentielles, paralleles a la direction de filage: l'une proche de [100], l'autre proche de [110]. La dilatometrie a ensuite permis de preciser quantitativement la proportion de chaque composante dans la texture d'ensemble, et de mettre en evidence l'augmentation du pourcentage de [100] lorsque le degre d'ecrouissage augmente. 4. Enfin le rapprochement de 2 et 3 montre que les allongements dus au cyclage thermique sont lies au pourcentage des composantes de texture. Il apparait que plus le pourcentage [100] augmente, plus l'allongement diminue. Par contre le comportement de materiaux a fort pourcentage de [110] reste imprecis. (auteur)}
place = {France}
year = {1964}
month = {Nov}
}