CobaltMaghrebV1, Maroc, Analysis, bibRecord, 000220

Co corner of the system Sm-Co-Zr: decomposition of the phase 1:7 and equilibria at 850°C

Identifieur interne : 000220 ( Maroc/Analysis ); précédent : 000219; suivant : 000221

Co corner of the system Sm-Co-Zr: decomposition of the phase 1:7 and equilibria at 850°C

Auteurs : S. Derkaoui [Maroc] ; N. Valignat [France] ; C. H. Allibert [France]

Source :

Journal of alloys and compounds [ 0925-8388 ] ; 1996.

RBID : Pascal:96-0208591

Descripteurs français

Pascal (Inist)
- Structure cristalline, Transformation phase, Equilibre phase, Précipitation, Diffusion(transport), Croissance cristalline, Samarium alliage, Cobalt alliage, Zirconium alliage, Alliage ternaire, Diagramme phase, 8130B.

English descriptors

KwdEn :
- Cobalt alloys, Crystal growth, Crystal structure, Diffusion, Phase diagrams, Phase equilibria, Phase transformations, Precipitation, Samarium alloys, Ternary alloys, Zirconium alloys.

Abstract

Copyright (c) 1996 Elsevier Science B.V. All rights reserved. In the Co range 100-75 at.% of the system Sm-Co-Zr, the phase equilibria at 850°C are determined by composition and crystal structure analysis of annealed alloys. Five three-phase fields centred on the phase R2:17, based on Sm₂Co₁₇, are detected. We observe the formation of ternary phases obtained by substitution of Zr for Sm in the binary compounds Sm_n+1Co_5n-1 (n=2-4). The genesis of the multiphase fields centred on R2:17 involves the transformation of the high-temperature phase 1:7. This transformation is studied by microstructural investigation. As predicted by the phase equilibria, the depletion 1:7→1:5+R2:17(+5:19) proceeds by continuous precipitation. The reactions 1:7→R2:17+Co+6:23 and 1:7→R2:17+6:23+1:3 occur by discontinuous processes. The limiting step is the diffusion controlled growth. &Dtilde;_1:5 is evaluated at 30×10^-20 m² s^-1. For the reactions 1:7→R2:17+(n+1:5n-1), a transient step of continuous precipitation of the coherent metastable phases is proposed.

Affiliations:

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Pascal:96-0208591

Le document en format XML

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<front><div type="abstract" xml:lang="en">Copyright (c) 1996 Elsevier Science B.V. All rights reserved. In the Co range 100-75 at.% of the system Sm-Co-Zr, the phase equilibria at 850°C are determined by composition and crystal structure analysis of annealed alloys. Five three-phase fields centred on the phase R2:17, based on Sm<sub>2</sub>
Co<sub>17</sub>
, are detected. We observe the formation of ternary phases obtained by substitution of Zr for Sm in the binary compounds Sm<sub>n+1</sub>
Co<sub>5n-1</sub>
 (n=2-4). The genesis of the multiphase fields centred on R2:17 involves the transformation of the high-temperature phase 1:7. This transformation is studied by microstructural investigation. As predicted by the phase equilibria, the depletion 1:7→1:5+R2:17(+5:19) proceeds by continuous precipitation. The reactions 1:7→R2:17+Co+6:23 and 1:7→R2:17+6:23+1:3 occur by discontinuous processes. The limiting step is the diffusion controlled growth. &Dtilde;<sub>1:5</sub>
 is evaluated at 30×10<sup>-20</sup>
 m<sup>2</sup>
 s<sup>-1</sup>
. For the reactions 1:7→R2:17+(n+1:5n-1), a transient step of continuous precipitation of the coherent metastable phases is proposed.</div>
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Co corner of the system Sm-Co-Zr: decomposition of the phase 1:7 and equilibria at 850°C

Co corner of the system Sm-Co-Zr: decomposition of the phase 1:7 and equilibria at 850°C

Source :

Descripteurs français

English descriptors

Abstract

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

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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