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Microanalytical study of the heterogeneous phases in commercial Al-Zn-Mg-Cu alloys

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Abstract

X-ray microanalysis and Convergent Beam Diffraction (CBD) studies were conducted on the second phase constituent and dispersoid particles in 7075 and 7475 aluminum alloys. Partial substitution of alloying elements was found to occur in all the second phase particles causing small deviations from the stoichiometric compositions reported for the binary and ternary compounds. The coarse constituent phases were identified to be Al7Cu2Fe, (Al,Cu)6(Fe,Cu), Mg2Si, α-Al12Fe3Si, amorphous silicon oxide, and a modified Al6Fe compound in decreasing order of abundance. The dispersoid particles were Al18Mg3Cr2 compound, and they formed in both triangular and spherical morphologies. Their compositions were found to vary slightly with the aging treatment. The crystal structure of the dispersoid phase consisted of a disordered form of a cubic structure (Fd3m) reported for the Al18Mg3Cr2 compound. The uniqueness of CBD analysis in the crystal structure determination is emphasized.

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Authors and Affiliations

  1. Exxon Research and Engineering Company, Route 22 East, 08801, Annandale, NJ

    Raghavan Ayer & J. Y. Koo

  2. Department of Physics, University of Bristol, Bristol, UK

    J. W. Steeds

  3. Westinghouse Electric Corporation, P.O. Box 3399, 15230, Pittsburgh, PA

    B. K. Park

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  1. Raghavan Ayer
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  2. J. Y. Koo
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  3. J. W. Steeds
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  4. B. K. Park
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Ayer, R., Koo, J.Y., Steeds, J.W. et al. Microanalytical study of the heterogeneous phases in commercial Al-Zn-Mg-Cu alloys. Metall Trans A 16, 1925–1936 (1985). https://doi.org/10.1007/BF02662393

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