Formation study of nanostructured Cr100-xCox (x = 10, 90) alloys
Identifieur interne : 000452 ( Main/Curation ); précédent : 000451; suivant : 000453Formation study of nanostructured Cr100-xCox (x = 10, 90) alloys
Auteurs : S. Louidi [Algérie] ; F. Z. Bentayeb [Algérie] ; W. Tebib [Algérie] ; J. J. Sunol [Espagne] ; L. Escoda [Espagne] ; A. M. Mercier [France]Source :
- Journal of alloys and compounds [ 0925-8388 ] ; 2012.
Descripteurs français
- Pascal (Inist)
- Alliage mécanique, Microscopie électronique balayage, Diffraction RX, Paramètre cristallin, Densité défaut, Méthode Rietveld, Microdéformation, Microstructure, Ductilité, Densité dislocation, Broyeur boulet, Relation structure propriété, Synthèse nanomatériau, Alliage désordonné, Alliage ordonné, Nanocristal, Chrome alliage, Solution solide, Cobalt alliage.
English descriptors
- KwdEn :
- Ball mill, Chromium alloys, Cobalt alloys, Defect density, Dislocation density, Disordered alloy, Ductility, Lattice parameters, Mechanical alloying, Microdeformation, Microstructure, Nanocrystal, Nanomaterial synthesis, Ordered alloy, Property structure relationship, Rietveld method, Scanning electron microscopy, Solid solutions, XRD.
Abstract
Cr90Co10 and Cr10Co90 mixtures were mechanically alloyed in order to obtain nanocrystalline alloys. The obtained powders were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The structural parameters such as the lattice parameters, the crystallite size, the microstrains and the defect density of the different phases were deduced from the Rietveld refinement of the XRD patterns using the MAUD program. For the Co-rich mixture the evolution with milling time of the SEM micrographs shows a tendency of particle agglomeration. However, in the case of the Cr-rich mixture, the particles tend to the fragmentation. The Rietveld refinement of XRD patterns of the Cr10Co90 mixture reveals the formation of disordered hcp and fcc Co(Cr) solid solutions. In the case of the Cr90Co10 mixture, only a disordered bcc Cr(Co) solid solution is obtained. The changes in the morphology and the structure of the two mixtures are explained on the basis of the mechanical and structural properties.
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Co<sub>x</sub>
(x = 10, 90) alloys</title>
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<term>Defect density</term>
<term>Dislocation density</term>
<term>Disordered alloy</term>
<term>Ductility</term>
<term>Lattice parameters</term>
<term>Mechanical alloying</term>
<term>Microdeformation</term>
<term>Microstructure</term>
<term>Nanocrystal</term>
<term>Nanomaterial synthesis</term>
<term>Ordered alloy</term>
<term>Property structure relationship</term>
<term>Rietveld method</term>
<term>Scanning electron microscopy</term>
<term>Solid solutions</term>
<term>XRD</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Alliage mécanique</term>
<term>Microscopie électronique balayage</term>
<term>Diffraction RX</term>
<term>Paramètre cristallin</term>
<term>Densité défaut</term>
<term>Méthode Rietveld</term>
<term>Microdéformation</term>
<term>Microstructure</term>
<term>Ductilité</term>
<term>Densité dislocation</term>
<term>Broyeur boulet</term>
<term>Relation structure propriété</term>
<term>Synthèse nanomatériau</term>
<term>Alliage désordonné</term>
<term>Alliage ordonné</term>
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<front><div type="abstract" xml:lang="en">Cr<sub>90</sub>
Co<sub>10</sub>
and Cr<sub>10</sub>
Co<sub>90</sub>
mixtures were mechanically alloyed in order to obtain nanocrystalline alloys. The obtained powders were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The structural parameters such as the lattice parameters, the crystallite size, the microstrains and the defect density of the different phases were deduced from the Rietveld refinement of the XRD patterns using the MAUD program. For the Co-rich mixture the evolution with milling time of the SEM micrographs shows a tendency of particle agglomeration. However, in the case of the Cr-rich mixture, the particles tend to the fragmentation. The Rietveld refinement of XRD patterns of the Cr<sub>10</sub>
Co<sub>90</sub>
mixture reveals the formation of disordered hcp and fcc Co(Cr) solid solutions. In the case of the Cr<sub>90</sub>
Co<sub>10</sub>
mixture, only a disordered bcc Cr(Co) solid solution is obtained. The changes in the morphology and the structure of the two mixtures are explained on the basis of the mechanical and structural properties.</div>
</front>
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