CobaltMaghrebV1, PascalFrancis, Corpus, bibRecord, 000350

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

Identifieur interne : 000350 ( PascalFrancis/Corpus ); précédent : 000349; suivant : 000351

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

Auteurs : S. Derkaoui ; N. Valignat ; C. H. Allibert

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.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A03		`1`		`@0 J. alloys compd.`
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A08	`01`	`1`	`ENG`	`@1 Co corner of the system Sm-Co-Zr: decomposition of the phase 1:7 and equilibria at 850°C`
A11	`01`	`1`		`@1 DERKAOUI (S.)`
A11	`02`	`1`		`@1 VALIGNAT (N.)`
A11	`03`	`1`		`@1 ALLIBERT (C. H.)`
A14	`01`			`@1 Département de Physique, Faculté des Sciences B.P. 28/S, Université Ibnou Zohr @2 8000 Agadir @3 MAR @Z 1 aut.`
A14	`02`			`@1 Laboratoire de Thermodynamique et de Physico-Chimie Métallurgiques, associé au CNRS (URA 29), E.N.S.E.E.G., BP. 75 @2 38402 Saint Martin d'Hères @3 FRA @Z 2 aut. @Z 3 aut.`
A20				`@1 112-119`
A21				`@1 1996`
A23	`01`			`@0 ENG`
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A64	`01`	`1`		`@0 Journal of alloys and compounds`
A66	`01`			`@0 CHE`
C01	`01`		`ENG`	@0 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.
C02	`01`	`3`		`@0 001B80A30B`
C02	`02`	`X`		`@0 240`
C03	`01`	`3`	`FRE`	`@0 Structure cristalline @5 01`
C03	`01`	`3`	`ENG`	`@0 Crystal structure @5 01`
C03	`02`	`3`	`FRE`	`@0 Transformation phase @5 02`
C03	`02`	`3`	`ENG`	`@0 Phase transformations @5 02`
C03	`03`	`3`	`FRE`	`@0 Equilibre phase @5 03`
C03	`03`	`3`	`ENG`	`@0 Phase equilibria @5 03`
C03	`04`	`3`	`FRE`	`@0 Précipitation @5 04`
C03	`04`	`3`	`ENG`	`@0 Precipitation @5 04`
C03	`05`	`3`	`FRE`	`@0 Diffusion(transport) @5 05`
C03	`05`	`3`	`ENG`	`@0 Diffusion @5 05`
C03	`06`	`3`	`FRE`	`@0 Croissance cristalline @5 06`
C03	`06`	`3`	`ENG`	`@0 Crystal growth @5 06`
C03	`07`	`3`	`FRE`	`@0 Samarium alliage @5 08`
C03	`07`	`3`	`ENG`	`@0 Samarium alloys @5 08`
C03	`08`	`3`	`FRE`	`@0 Cobalt alliage @5 09`
C03	`08`	`3`	`ENG`	`@0 Cobalt alloys @5 09`
C03	`09`	`3`	`FRE`	`@0 Zirconium alliage @5 10`
C03	`09`	`3`	`ENG`	`@0 Zirconium alloys @5 10`
C03	`10`	`3`	`FRE`	`@0 Alliage ternaire @5 23`
C03	`10`	`3`	`ENG`	`@0 Ternary alloys @5 23`
C03	`11`	`3`	`FRE`	`@0 Diagramme phase @5 24`
C03	`11`	`3`	`ENG`	`@0 Phase diagrams @5 24`
C03	`12`	`3`	`FRE`	`@0 8130B @2 PAC @4 INC @5 95`
N21				`@1 141`

Format Inist (serveur)

NO :	PASCAL 96-0208591 Elsevier
ET :	Co corner of the system Sm-Co-Zr: decomposition of the phase 1:7 and equilibria at 850°C
AU :	DERKAOUI (S.); VALIGNAT (N.); ALLIBERT (C. H.)
AF :	Département de Physique, Faculté des Sciences B.P. 28/S, Université Ibnou Zohr/8000 Agadir/Maroc (1 aut.); Laboratoire de Thermodynamique et de Physico-Chimie Métallurgiques, associé au CNRS (URA 29), E.N.S.E.E.G., BP. 75/38402 Saint Martin d'Hères/France (2 aut., 3 aut.)
DT :	Publication en série; Niveau analytique
SO :	Journal of alloys and compounds; ISSN 0925-8388; Suisse; Da. 1996; Vol. 235; No. 1; Pp. 112-119; Abs. anglais
LA :	Anglais
EA :	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.
CC :	001B80A30B; 240
FD :	Structure cristalline; Transformation phase; Equilibre phase; Précipitation; Diffusion(transport); Croissance cristalline; Samarium alliage; Cobalt alliage; Zirconium alliage; Alliage ternaire; Diagramme phase; 8130B
ED :	Crystal structure; Phase transformations; Phase equilibria; Precipitation; Diffusion; Crystal growth; Samarium alloys; Cobalt alloys; Zirconium alloys; Ternary alloys; Phase diagrams
LO :	INIST-1151
ID :	96-0208591

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Pascal:96-0208591

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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>
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 m<sup>2</sup>
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Co<sub>5n-1</sub>
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 m<sup>2</sup>
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<server><NO>PASCAL 96-0208591 Elsevier</NO>
<ET>Co corner of the system Sm-Co-Zr: decomposition of the phase 1:7 and equilibria at 850°C</ET>
<AU>DERKAOUI (S.); VALIGNAT (N.); ALLIBERT (C. H.)</AU>
<AF>Département de Physique, Faculté des Sciences B.P. 28/S, Université Ibnou Zohr/8000 Agadir/Maroc (1 aut.); Laboratoire de Thermodynamique et de Physico-Chimie Métallurgiques, associé au CNRS (URA 29), E.N.S.E.E.G., BP. 75/38402 Saint Martin d'Hères/France (2 aut., 3 aut.)</AF>
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<SO>Journal of alloys and compounds; ISSN 0925-8388; Suisse; Da. 1996; Vol. 235; No. 1; Pp. 112-119; Abs. anglais</SO>
<LA>Anglais</LA>
<EA>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.</EA>
<CC>001B80A30B; 240</CC>
<FD>Structure cristalline; Transformation phase; Equilibre phase; Précipitation; Diffusion(transport); Croissance cristalline; Samarium alliage; Cobalt alliage; Zirconium alliage; Alliage ternaire; Diagramme phase; 8130B</FD>
<ED>Crystal structure; Phase transformations; Phase equilibria; Precipitation; Diffusion; Crystal growth; Samarium alloys; Cobalt alloys; Zirconium alloys; Ternary alloys; Phase diagrams</ED>
<LO>INIST-1151</LO>
<ID>96-0208591</ID>
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</inist>
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	Serveur d'exploration sur le cobalt au Maghreb
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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

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