Co corner of the system Sm-Co-Zr: decomposition of the phase 1:7 and equilibria at 850°C
Identifieur interne : 000353 ( PascalFrancis/Curation ); précédent : 000352; suivant : 000354Co 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.
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- Pascal (Inist)
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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 Smn+1Co5n-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.
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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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. 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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, 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>
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