Phase equilibria at 1150°C in the Co-rich alloys SmCoZr and structure of the 1:7 phase

In the concentration range 75–100 at.% Co, the isothermal section at 1150°C of the system SmCoZr is determined experimentally. The following features are evidenced: a very small Sm solubility in Co, Zr2Co11, and Zr6Co23, an extended Zr for Sm substitution rate in SmCo3, Sm2Co7 and Sm5Co19, and a s...

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Bibliographic Details
Published in:Journal of alloys and compounds 1996-01, Vol.232 (1-2), p.296-301
Main Authors: Derkaoui, S., Valignat, N., Allibert, C.H.
Format: Article
Language:English
Subjects:
1:7 phase
Phase equilibria
SmCoZr
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Summary:In the concentration range 75–100 at.% Co, the isothermal section at 1150°C of the system SmCoZr is determined experimentally. The following features are evidenced: a very small Sm solubility in Co, Zr2Co11, and Zr6Co23, an extended Zr for Sm substitution rate in SmCo3, Sm2Co7 and Sm5Co19, and a significant Zr solubility in SmCo5 and Sm2Co17 that induces the existence of a continuous ternary single phase 1:7. On the basis of the lattice parameter data, the formation of this phase by the substitution of Co dumbbells and/or Sm atoms for Zr atoms is proposed.
ISSN:0925-8388
1873-4669
DOI:10.1016/0925-8388(95)02003-9