Abstract
The effects of matrix/precipitate interface states on coarsening of Co and γ-Fe precipitates in a Cu–4 wt.%Co and a Cu–2 wt.%Fe alloy aged at 500 and 700 °C have been examined by transmission electron microscopy (TEM) observations, electrical resistivity measurements, and length-change measurements. Analyses of TEM images show that the average radius for coherent/semi-coherent transition is 6–12 nm for the Co precipitates and 10–20 nm for the γ-Fe precipitates. The coarsening rates of the Co and γ-Fe precipitates are unchanged by the transitions in coherency of the precipitates. The interface energies γ of coherent Co and γ-Fe precipitates are estimated from data on coarsening alone as 0.15 and 0.27 J m−2. From length-change measurements of the Cu–Co and Cu–Fe alloys during aging, the estimates of the isotropic misfit strains of Co and γ-Fe precipitates are −0.018 and −0.016 for the coherent interfaces and −0.013 and −0.012 for the semi-coherent interfaces. Free energy analyses for the coarsening of Co and γ-Fe precipitates reveal that the values of γ of semi-coherent Cu/Co and Cu/γ-Fe interfaces are 0.24 and 0.34 J m−2.
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Acknowledgements
We thank Professor K. Tazaki, Kanazawa University, for use of JEOL2010FEF. We also acknowledge Mr. K. Higashimine of the Center for Nano Materials and Technology, Japan Advanced Institute of Science and Technology, for the TEM observation by HITACHI H9000-NAR.
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Watanabe, D., Watanabe, C. & Monzen, R. Effect of coherency on coarsening of second-phase precipitates in Cu-base alloys. J Mater Sci 43, 3946–3953 (2008). https://doi.org/10.1007/s10853-007-2373-4
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DOI: https://doi.org/10.1007/s10853-007-2373-4