Abstract
By taking into account the contributions of the band and local mode frequencies, the temperature- and pressure-dependent mean-square displacement in AI-Li solid solution was quantitatively calculated. Next, the concentration-dependence of the Debye temperature at higher and lower temperatures is estimated. The Debye temperature decreases with increasing the solubility of Li at low temperatures, while it increases at higher temperatures. Then, the compression effect on the solidus curves in the α-phase AI-Li solid solution is expressed by applying Lindeman's melting law to the alloy systems, and an increase of solubility exceeding 20 at. % Li in Al is predicted under pressure.
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