CobaltMaghrebV1, Main, Exploration, bibRecord, 000639

Formation study of the ball-milled Cr20Co80 alloy

Identifieur interne : 000639 ( Main/Exploration ); précédent : 000638; suivant : 000640

Formation study of the ball-milled Cr20Co80 alloy

Auteurs : S. Louidi [Algérie] ; F.-Z. Bentayeb [Algérie] ; J. J. Sunol [Espagne] ; L. Escoda [Espagne]

Source :

Journal of alloys and compounds [ 0925-8388 ] ; 2010.

RBID : Pascal:10-0176842

Descripteurs français

Pascal (Inist)
- Broyeur boulet, Broyeur satellite, Modification structure, Diffraction RX, Microstructure, Densité défaut empilement, Métallurgie poudre, Densité dislocation, Défaut empilement, Cinétique, Cobalt alliage, Réseau cubique face centrée, Réseau hexagonal compact, Chrome alliage, Métal transition alliage.

English descriptors

KwdEn :
- Ball mill, Chromium alloy, Cobalt alloy, Dislocation density, FCC lattices, HCP lattices, Kinetics, Microstructure, Planetary mill, Powder metallurgy, Stacking fault, Stacking fault density, Structure modification, Transition metal alloy, X ray diffraction.

Abstract

The ball milling of blended chromium and cobalt powders was carried out in a planetary mill in order to obtain a nanostructured Cr₂₀Co₈₀ alloy. The structural modifications at different stages of the ball milling are investigated with X-ray diffraction. Several microstructure parameters such as the crystallite size, microstrains, stacking faults, dislocation density and phase fractions are determined. As the milling proceeded, the chromium peaks disappeared progressively indicating the dissolution of the chromium atoms into the cobalt matrix. Disordered hcp-Co(Cr) and fcc-Co(Cr) solid solutions were formed after 24 h of milling. The hcp solid solution has a lower value of the crystallite size and a higher degree of microstrains and dislocation density than the fcc solid solution. For prolonged milling (48 h), plastic deformations introduce large amounts of stacking faults in the hcp structure leading to the reverse hcp-fcc transformation of the Co(Cr) solid solution. The kinetic parameters n = 0.81 and k = 0.11, obtained using the Johnson-Mehl-Avrami formalism, correspond to diffusion mechanisms through interfaces and dislocations.

Affiliations:

Links toward previous steps (curation, corpus...)

to stream PascalFrancis, to step Corpus: 000098
to stream PascalFrancis, to step Curation: 000197
to stream PascalFrancis, to step Checkpoint: 000092
to stream Main, to step Merge: 000643
to stream Main, to step Curation: 000639

Le document en format XML

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<term>Microstructure</term>
<term>Planetary mill</term>
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<term>Broyeur satellite</term>
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<term>Diffraction RX</term>
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<term>Densité défaut empilement</term>
<term>Métallurgie poudre</term>
<term>Densité dislocation</term>
<term>Défaut empilement</term>
<term>Cinétique</term>
<term>Cobalt alliage</term>
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<front><div type="abstract" xml:lang="en">The ball milling of blended chromium and cobalt powders was carried out in a planetary mill in order to obtain a nanostructured Cr<sub>20</sub>
Co<sub>80</sub>
 alloy. The structural modifications at different stages of the ball milling are investigated with X-ray diffraction. Several microstructure parameters such as the crystallite size, microstrains, stacking faults, dislocation density and phase fractions are determined. As the milling proceeded, the chromium peaks disappeared progressively indicating the dissolution of the chromium atoms into the cobalt matrix. Disordered hcp-Co(Cr) and fcc-Co(Cr) solid solutions were formed after 24 h of milling. The hcp solid solution has a lower value of the crystallite size and a higher degree of microstrains and dislocation density than the fcc solid solution. For prolonged milling (48 h), plastic deformations introduce large amounts of stacking faults in the hcp structure leading to the reverse hcp-fcc transformation of the Co(Cr) solid solution. The kinetic parameters n = 0.81 and k = 0.11, obtained using the Johnson-Mehl-Avrami formalism, correspond to diffusion mechanisms through interfaces and dislocations.</div>
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Serveur d'exploration sur le cobalt au Maghreb

Formation study of the ball-milled Cr20Co80 alloy

Formation study of the ball-milled Cr20Co80 alloy

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri