Abstract
The effect of coherency on coarsening of fcc Co–Fe precipitates in a Cu–1.47 wt.%Co–0.56 wt.%Fe (Co : Fe = 7:3 in atomic ratio) alloy aged at 873–973 K has been studied by measuring both the precipitate size by transmission electron microscopy and the solute concentration in the Cu matrix by electrical resistivity measurements. The precipitate phase consists of 7 parts of Co and 3 parts of Fe in atomic ratio, irrespective of the precipitate size. The precipitates smaller than about 8 nm in radius are coherent with the Cu-matrix. When the average precipitate radius is over 18 nm, all the precipitates become semi-coherent. The coarsening rates are not affected by the coherency of the precipitates. The precipitate/matrix interface energy γ has been derived, independently of the diffusivities of solute atoms using a coarsening model developed by Kuehmann and Voorhees for ternary systems. The precipitates are coherent or semi-coherent with the matrix, the experimentally obtained value of γ is 0.2 J/m2. This value lies between the reported values of γ = 0.15 J/m2 for Co precipitates and γ = 0.25 J/m2 for γ-Fe precipitates.
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Acknowledgements
This work has been partially supported by Inoue Foundation for Science. The authors thank Professor K. Tazaki, Kanazawa University, for use of the JEOL 2000EX and 2010FEF. We also acknowledge Mr. K. Higashimine of the Center for Nano Materials and Technology, Japan Advanced Institute of Science and Technology, for the TEM observations.
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Watanabe, C., Watanabe, D. & Monzen, R. Coarsening of Co-rich precipitates in a Cu–Co–Fe ternary alloy. J Mater Sci 43, 3817–3824 (2008). https://doi.org/10.1007/s10853-007-2290-6
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DOI: https://doi.org/10.1007/s10853-007-2290-6