Liquid phase separation in melt-spun Cu70Co30 ribbon

Due to the large heat of mixing in the Cu-Co system, liquid phase separation is inevitable in Cu70Co30 ribbons during the course of the quenching process. The resulting large Co-rich particles exhibit either elongated or roughly spherical morphology with a distinct Cu-rich shell. The large Co-rich p...

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Bibliographic Details
Published in:Materials letters 1997-06, Vol.31 (3-6), p.261-266
Main Authors: Song, X., Mahon, S.W., Cochrane, R.F., Hickey, B.J., Howson, M.A.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Cu-Co
Electrical and magnetic properties (related to treatment conditions)
Exact sciences and technology
Giant magnetoresistance
Materials science
Melt-spinning
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase separation
Physics
Solidification
Treatment of materials and its effects on microstructure and properties
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Summary:Due to the large heat of mixing in the Cu-Co system, liquid phase separation is inevitable in Cu70Co30 ribbons during the course of the quenching process. The resulting large Co-rich particles exhibit either elongated or roughly spherical morphology with a distinct Cu-rich shell. The large Co-rich particles are about 100–300 nm and the shell is about 15–40 nm wide. On annealing, diffusion of Cu and Co through the shell region results in a broadening and eventual disappearance of the shell region. A maximum magnetoresistance of 22% results after annealing at 723 K for 1 h, and more investigations are necessary to clarify the contribution of these large Co-rich particles to the observed magnetoresistance.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(96)00284-4