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Characterization of the aging response of a melt-spun Al-Be-Li alloy ribbon

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Abstract

A rapidly solidified Al-10 wt pct Be-3 wt pet Li alloy has been produced by a melt-spinning technique. The aging behavior of the melt-spun ribbon has been characterized by a number of techniques, including differential scanning calorimetry, hardness measurements, and transmission electron microscopy. The results have shown that the aging responses of the ternary Al-Be-Li alloy are very similar to those of Al-Li binary alloys. Specifically, δ′ precipitates are formed at temperatures near 180 °C and they transform to δ at temperatures around 300 °C. Microstructural examination indicates that, in the Al-Be-Li alloy, α-Be particles are present in the matrix as independent dispersoids and, apparently, have little effect on the aging behavior of the Al-Li matrix; no new phases are present in the matrix of specimens heat treated up to 400 °C. The α-Be particles coarsen, however, above a temperature of approximately 300 °C. The growth of α-Be particles follows the classical Ostwald coarsening type of mechanism.

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Authors and Affiliations

  1. Research and Development Division, Lockheed Missiles and Space Co., Inc., 3251 Hanover Street, 94304, Palo Alto, CA

    T. G. Nieh (Staff Scientist)

  2. Department of Materials Science and Engineering, University of Notre Dame, 46556, Notre Dame, IN

    A. R. Pelton (Assistant Professor)

  3. Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box X, 37630, Oak Ridge, TN

    W. C. Oliver (Research Scientist)

  4. Metallurgy Department, Research and Development Division, Lockheed Missiles and Space Co., Inc., 94304, Palo Alto, CA

    J. Wadsworth (Manager)

Authors
  1. T. G. Nieh
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  2. A. R. Pelton
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  3. W. C. Oliver
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  4. J. Wadsworth
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Nieh, T.G., Pelton, A.R., Oliver, W.C. et al. Characterization of the aging response of a melt-spun Al-Be-Li alloy ribbon. Metall Trans A 19, 1173–1178 (1988). https://doi.org/10.1007/BF02662577

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  • DOI: https://doi.org/10.1007/BF02662577

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