Phase diagrams and compression effect on solidus curve of Al-rich Al–Cu alloy

Abstract

By considering the contributions from the band and local mode frequencies, the temperature- and pressure-dependent mean-square displacement for Al–Cu solid solution is quantitatively obtained. Next, the concentration dependence of the Debye temperature at higher and lower temperatures is estimated. The obtained Debye temperature decreases with the solubility of Cu at low temperatures, but increases at high temperatures. Then, the compression effect on the solidus curves for the Al–Cu solid solution is presented by applying Lindeman's melting law to the alloy systems, and an increase of the solubility exceeding 10 at% Cu in Al is predicted under pressure.