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Coarsening rate of Β precipitates in Al-11Mg alloy

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Abstract

The coarsening rates of the Β precipitates in an Al-11 wt pct Mg alloy at 250 ‡C, 316 ‡C, and 330 ‡C aging temperatures were investigated. As predicted by the modified Lifshitz-Slyozov-Wagner (MLSW) theory of diffusion controlled particle coarsening, a linear dependence ofr 3 ont in the long time aging region was observed. Interfacial energies of 8.1, 1.8, and 1.7 J/m2 for 250 ‡C, 316 ‡C, and 330 ‡C, respectively, were computed from these data using the MLSW theory. The high values of interfacial energy indicate that the Β precipitates are incoherent with respect to the Al matrix. The especially high value of interfacial energy and low activation energy for the precipitate coarsening at 250 ‡C suggest that significant short circuit diffusion occurs at this aging temperature.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Korea University, Seoul, Korea

    S. I. Kwun (Professor)

  2. Northwestern University, 60201, Evanston, IL

    M. E. Fine (Walter P. Murphy Professor of Materials Science and Engineering)

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  1. S. I. Kwun
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  2. M. E. Fine
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Kwun, S.I., Fine, M.E. Coarsening rate of Β precipitates in Al-11Mg alloy. Metall Trans A 16, 709–713 (1985). https://doi.org/10.1007/BF02814822

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  • DOI: https://doi.org/10.1007/BF02814822

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