Abstract
In this paper the results of a quantitative transmission electron microscopy investigation of the precipitation process of the metalstable δ′ (Al 3Li) phase in Al-2.8Li-0.3Mn (where the alloy composition is given in approximate weight per cent) are described. Isothermal aging times were varied from 12 h to 12 weeks at three aging temperatures: 168, 200 and 225°C. Particle size distributions (PSDs) were determined for various aging times at the three aging temperatures. The growth of δ′ was found to obey Ostwald ripening kinetics. A normal distribution was found to approximate the experimental PSDs more closely than the negatively skewed or log-normal distribution predicted by many of the Ostwald ripening theories.
Published Version
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