Characterization of the aging response of a melt-spun Al-Be-Li alloy ribbon |
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| Authors: | T. G. Nieh A. R. Pelton W. C. Oliver J. Wadsworth |
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| Affiliation: | (1) Research and Development Division, Lockheed Missiles and Space Co., Inc., 3251 Hanover Street, 94304 Palo Alto, CA;(2) Department of Materials Science and Engineering, University of Notre Dame, 46556 Notre Dame, IN;(3) Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box X, 37630 Oak Ridge, TN;(4) Metallurgy Department, Research and Development Division, Lockheed Missiles and Space Co., Inc., 94304 Palo Alto, CA |
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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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