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Fuel material neutron crystallography texture and structure determinations (1960); Etudes sur l'evolution des structures cristallines de l'uranium par neutrocristallographie (1960)

Abstract

The method here described has the advantage over the classic X-ray diffraction method of giving fuller and quicker information about the texture of a built polycrystalline aggregate of U metal, and of following more easily the evolution of its crystalline structure during the allotropic transformation. It uses a thermal neutron beam coming out of the Saclay CEN reactor EL3, monochromatized at {lambda} = 1,143 {+-} 0,030 Angstrom, and directed after collimation, perpendicularly to the fiber axis of an optimized dimensioned cylindrical specimen. The scattered neutron beam is collected into a BF3 counter which is able to describe in a horizontal plane containing the neutron beam axis, a circle 130 cm in radius centered on the specimen. In testing at room temperature a specimen which is entirely free from residual or parasite texture, the reference spectral lines of pure U alpha phase are determined by means of a recording meter and a counting device. The same method gives the spectral distribution of the U beta phase by using, instead of pure uranium, a metastable solid solution containing a minimum concentration of some metallic impurities (Cr or Si). These spectra are then compared with the calculated ones and the X-ray diffraction ones.  More>>
Authors:
Laniesse, J; Englander, M; Meriel, P [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France).Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1960
Product Type:
Technical Report
Report Number:
CEA-R-1662
Resource Relation:
Conference: 4{sup th} International Symposium on Solids Reactivity, Conference presentee au 4. symposium international sur la reactivite des solides, Amsterdam (Netherlands), 30 May - 4 Jun 1960
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALLOTROPY; ARRHENIUS EQUATION; BRAGG REFLECTION; CHEMICAL REACTION KINETICS; CHROMIUM ADDITIONS; COMPARATIVE EVALUATIONS; CRYSTAL STRUCTURE; CRYSTAL-PHASE TRANSFORMATIONS; CRYSTALLOGRAPHY; HEAT TREATMENTS; IMPURITIES; NEUTRON DIFFRACTION; POLYCRYSTALS; SPECTRAL RESPONSE; STRUCTURAL CHEMICAL ANALYSIS; TEXTURE; THERMAL NEUTRONS; URANIUM ALLOYS; URANIUM-ALPHA; URANIUM-BETA; X-RAY DIFFRACTION
OSTI ID:
20953753
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR07R1662105034
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
23 pages
Announcement Date:
Dec 21, 2007

Citation Formats

Laniesse, J, Englander, M, and Meriel, P. Fuel material neutron crystallography texture and structure determinations (1960); Etudes sur l'evolution des structures cristallines de l'uranium par neutrocristallographie (1960). France: N. p., 1960. Web.
Laniesse, J, Englander, M, & Meriel, P. Fuel material neutron crystallography texture and structure determinations (1960); Etudes sur l'evolution des structures cristallines de l'uranium par neutrocristallographie (1960). France.
Laniesse, J, Englander, M, and Meriel, P. 1960. "Fuel material neutron crystallography texture and structure determinations (1960); Etudes sur l'evolution des structures cristallines de l'uranium par neutrocristallographie (1960)." France.
@misc{etde_20953753,
title = {Fuel material neutron crystallography texture and structure determinations (1960); Etudes sur l'evolution des structures cristallines de l'uranium par neutrocristallographie (1960)}
author = {Laniesse, J, Englander, M, and Meriel, P}
abstractNote = {The method here described has the advantage over the classic X-ray diffraction method of giving fuller and quicker information about the texture of a built polycrystalline aggregate of U metal, and of following more easily the evolution of its crystalline structure during the allotropic transformation. It uses a thermal neutron beam coming out of the Saclay CEN reactor EL3, monochromatized at {lambda} = 1,143 {+-} 0,030 Angstrom, and directed after collimation, perpendicularly to the fiber axis of an optimized dimensioned cylindrical specimen. The scattered neutron beam is collected into a BF3 counter which is able to describe in a horizontal plane containing the neutron beam axis, a circle 130 cm in radius centered on the specimen. In testing at room temperature a specimen which is entirely free from residual or parasite texture, the reference spectral lines of pure U alpha phase are determined by means of a recording meter and a counting device. The same method gives the spectral distribution of the U beta phase by using, instead of pure uranium, a metastable solid solution containing a minimum concentration of some metallic impurities (Cr or Si). These spectra are then compared with the calculated ones and the X-ray diffraction ones. After choosing a certain number of given diffraction lines, it was possible to check qualitatively and semi-quantitatively the evolution of eventual predominant orientations versus mechanical and/or thermal treatments. By following the intensity of a 'mixed' spectrum line suitably placed within the lines of the {alpha} and {beta} spectra, it was possible to determine the kinetic of the {beta} {yields} {alpha} transformation at temperature where frequency and counting rates are adequate. By way of examples, the paper illustrates results obtained with a 600 deg. C extruded pure U rod (reduction in area = 6 ,4) , and with a four times beta-water quenched {alpha} extruded specimen. It also shows the equation giving the time for the {beta} {yields} {alpha} transformation at 333 deg. K of a bulk U alloy containing 1000 ppm chromium. (author) [French] La methode utilisee permet d'obtenir d'une maniere plus rapide et plus statistique que par difraction de rayons X des informations sur la texture d'agregats polycristallins d'uranium-metal et sur les cours de l'evolution de leurs structures crystallines pendant leurs transformations allotropiques. Elle emploie un faisceau neutronique sortant du reacteur EL3 au CEN Saclay, monochromatise a {lambda} = 1,143 A {+-} 0,030 Angstrom; l'axe de ce faisceau rigoureusement collimate, est dirige perpendiculairement a l'axe de fibre de l'echantillon de forme cylindrique et de dimensions optimales. Les neutrons diffuses sont recus dans un compteur BF3 qui peut decrire un cercle centre sur l'echantillon (R = 1,30 m), dans un plan horizontal passant par l'axe du faisceau; de plus, le dispositif de fixation de l'echantillon permet la rotation de celui-ci autour de son axe longitudinal. Le spectre de reference des raies de diffraction neutronique de la phase {alpha} de l'uranium pur est ainsi obtenu a la temperature ordinaire, en utilisant un echantillon pour lequel il est certain qu'il n'existe aucune texture parasite ou residuaire. Il en est de meme pour la phase {beta} d'une solution solide metastable d'uranium contenant la concentration nominale d'impuretes metalliques telles que le Cr ou le Si. Ces deux spectres sont compares aux spectres theoriques ainsi qu'aux spectres de diffraction roentgenographiques. En choisissant ensuite convenablement un certain nombre de ces raies de diffraction, les evaluations d'orientations predominantes eventuelles peuvent etre suivies qualitativement et semi-quantitativement, en fonction des differents traitements mecaniques et/ou thermiques subis simultanement ou non par l'echantillon. De meme en enregistrant d'une maniere continue l'intensite d'une raie mixte judicieusement placee par rapport aux raies des spectres {alpha} et {beta}, la transformation {beta} {yields} {alpha} peut etre suivie en fonction du temps et a des temperatures telles que les taux de comptages ainsi que leurs frequences soient suffisants. A titre d'exemple, dans la presente communication, les resultats obtenus sur des echantillons d'uranium pur file a 600 deg. C avec un rapport de plage egal a 10,4 et sur des echantillons ayant subi ensuite 4 recuits a 700 deg. C interrompus par 4 trempes a l'eau, sont exprimes, ainsi que l'equation regissant la cinetique de transformation allotropique {beta} {yields} {alpha} a la temperature de 333 deg. K d'un alliage massif d'U contenant 1000 parties par million de Cr. (auteur)}
place = {France}
year = {1960}
month = {Jul}
}