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Influence of boundary structure on cellular nucleation in Cu-3 w/oTi age-hardening alloys

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Abstract

The kinetics of cellular precipitation at the grain boundaries in a Cu-3 w/o Ti alloy was investigated using the Johnson–Mehl–Avrami (JMA) model. The experimental results are well described by Cahn’s site saturation model, showing that the initiation of cellular colony precipitation is limited by the availability of the nucleation sites. Orientation imaging microscopy (OIM) and transmission electron microscopy (TEM) analyses show that not all high angle grain boundaries contain preferred nucleation sites. It was observed that grain boundaries in aged alloys that do not have cellular colonies tend to have a special coincident site lattice (CSL) relationship.

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Acknowledgements

NB thanks the Office of the Civil Service Commission, Bangkok, Thailand for partial support during the performance of the research. We also thank the U.S. Department of Energy and the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48 for partial financial support during the fiscal year 2007.

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Authors and Affiliations

  1. Department of Primary Industries and Mines, Ministry of Industry, Bangkok, Thailand

    N. Boonyachut

  2. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213, USA

    D. E. Laughlin

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  1. N. Boonyachut
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  2. D. E. Laughlin
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Correspondence to N. Boonyachut.

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Boonyachut, N., Laughlin, D.E. Influence of boundary structure on cellular nucleation in Cu-3 w/oTi age-hardening alloys. J Mater Sci 44, 449–456 (2009). https://doi.org/10.1007/s10853-008-3073-4

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  • DOI: https://doi.org/10.1007/s10853-008-3073-4

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