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Electron microscope observation of single - crystalline beryllium thin foils; Observation de lames minces monocristallines de beryllium en microscopie electronique

Abstract

Thin foils prepared from single crystalline beryllium simples deformed at room temperature, have been observed by transmission electron microscopy. The various deformation modes have been investigated separately, from their early stages and their characteristic dislocation configurations have been observed. Basal slip is characterized at is outset by the presence of numerous dipoles and elongated prismatic loops. More pronounced cold work leads to the formation of dislocation tangles and bundles which eventually give a cellular structure. Prismatic slip begins by the cross-slip of dislocations from the basal plane into the prismatic plane. A cellular structure is equally observed in heavily deformed samples. Sessile dislocations have been observed in twin boundaries; they are produced by reactions between slip dislocations and twin dislocations. Finally, the study of samples quenched from 1100 deg. C and annealed at 200 deg. C has shown that the observed loops lie in prismatic planes and have a Burgers vector b 1/3<1 1 2-bar 0>. (authors) [French] On a observe en microscopie electronique par transmission des lames minces tirees d'eprouvettes monocristallines de beryllium deformees a l'ambiante. On a etudie separement les differents modes de deformation a partir de leur stade elementaire en observant les configurations de dislocations caracteristiques. Le  More>>
Authors:
Antolin, J; Poirier, J P; Dupouy, J M [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1965
Product Type:
Technical Report
Report Number:
CEA-R-2789
Resource Relation:
Other Information: 19 refs
Subject:
36 MATERIALS SCIENCE; ANNEALING; BERYLLIUM; BURGERS VECTOR; DEFORMATION; DIPOLES; DISLOCATIONS; HCP LATTICES; QUENCHING; SLIP; TRANSMISSION ELECTRON MICROSCOPY; TWINNING
OSTI ID:
20706587
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2789021792
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
54 pages
Announcement Date:
Apr 27, 2006

Citation Formats

Antolin, J, Poirier, J P, and Dupouy, J M. Electron microscope observation of single - crystalline beryllium thin foils; Observation de lames minces monocristallines de beryllium en microscopie electronique. France: N. p., 1965. Web.
Antolin, J, Poirier, J P, & Dupouy, J M. Electron microscope observation of single - crystalline beryllium thin foils; Observation de lames minces monocristallines de beryllium en microscopie electronique. France.
Antolin, J, Poirier, J P, and Dupouy, J M. 1965. "Electron microscope observation of single - crystalline beryllium thin foils; Observation de lames minces monocristallines de beryllium en microscopie electronique." France.
@misc{etde_20706587,
title = {Electron microscope observation of single - crystalline beryllium thin foils; Observation de lames minces monocristallines de beryllium en microscopie electronique}
author = {Antolin, J, Poirier, J P, and Dupouy, J M}
abstractNote = {Thin foils prepared from single crystalline beryllium simples deformed at room temperature, have been observed by transmission electron microscopy. The various deformation modes have been investigated separately, from their early stages and their characteristic dislocation configurations have been observed. Basal slip is characterized at is outset by the presence of numerous dipoles and elongated prismatic loops. More pronounced cold work leads to the formation of dislocation tangles and bundles which eventually give a cellular structure. Prismatic slip begins by the cross-slip of dislocations from the basal plane into the prismatic plane. A cellular structure is equally observed in heavily deformed samples. Sessile dislocations have been observed in twin boundaries; they are produced by reactions between slip dislocations and twin dislocations. Finally, the study of samples quenched from 1100 deg. C and annealed at 200 deg. C has shown that the observed loops lie in prismatic planes and have a Burgers vector b 1/3<1 1 2-bar 0>. (authors) [French] On a observe en microscopie electronique par transmission des lames minces tirees d'eprouvettes monocristallines de beryllium deformees a l'ambiante. On a etudie separement les differents modes de deformation a partir de leur stade elementaire en observant les configurations de dislocations caracteristiques. Le glissement basal est caracterise a son debut par la presence de nombreux dipoles et de boucles prismatiques allongees. Des ecrouissages plus forts conduisent a la formation d'echeveaux et de gerbes qui finissent par donner une structure cellulaire. Le glissement prismatique debute par le glissement des dislocations hors du plan de base dans les plans prismatiques. On trouve egalement une structure cellulaire pour de forts ecrouissages. Dans les joints de macle, on a observe des dislocations sessiles formees par la reaction entre dislocations de macle et dislocations de glissement. Enfin l'etude d'echantillons trempes a 1100 deg. C et revenus a 200 deg. C a montre que les boucles de trempe observees sont situees dans les plans prismatiques avec un vecteur de Burgers b = 1/3<1 1 2-bar 0>. (auteurs)}
place = {France}
year = {1965}
month = {Jul}
}