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Diffusion of zinc in the lamellar eutectic, Al-CuAl2

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Abstract

Diffusion of Zn in the aligned lamellar Al-CuAl2 eutectic has been studied. Couples were prepared to observe diffusion either parallel or perpendicular to eutectic interfaces at temperatures of 193, 240, and 287° and times to 1.66 × 108 sec. Both optical and electron microprobe techniques were used to study the resultant microstructures. Zn is present in the α Al platelets at distances far greater than predicted by lattice diffusion. The diffusion of Zn into 0-CuAl2 causes a rapid transformation of θ to a two phase mixture of α particles in a matrix of T-Al3ZnCu3. Advance of the growth front (θ → Τ + α) is parabolic with time, and the growth rate increases with increasing temperature. The transformation to Τ + α is observed to be slower in the 0 platelets of the eutectic than in bulk 0. In the eutectic, less Zn reaches the advancing transformation front because of lateral diffusion of Zn into adjacent a platelets. An experimentally determined activation energy for the combined transformation and diffusion processes suggests that the α -Τ boundaries act as high-diffusivity paths for Zn diffusion.

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Authors and Affiliations

  1. General Electric Research and Development Center, Schenectady, N. Y.

    M. R. Jackson (Research Metallurgist)

  2. Department of Metallurgy and Materials Science, Lehigh University, Bethlehem, Pa

    J. I. Goldstein (Associate Professor) & R. W. Kraft (Professor)

Authors
  1. M. R. Jackson
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  2. J. I. Goldstein
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  3. R. W. Kraft
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Additional information

This paper is based upon a thesis submitted by M. R. Jackson in partial fulfillment of the requirements of the degree of Doctor of Philosophy at Lehigh University.

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Jackson, M.R., Goldstein, J.I. & Kraft, R.W. Diffusion of zinc in the lamellar eutectic, Al-CuAl2 . Metall Trans 4, 2145–2151 (1973). https://doi.org/10.1007/BF02643280

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  • DOI: https://doi.org/10.1007/BF02643280

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