Abstract
The lattice dynamics and thermal properties of AlCu alloy by solid-solutioning under pressure are studied using our previous microscopic electronic theory. The phonon frequencies of the band and local modes and the lattice specific heat at constant volume are presented theoretically for the Al 1− x Cu x system. The band and local mode frequencies increase with the solubility of Cu, and the specific heat decreases except at low temperatures. The Debye temperature for the Al 1− x Cu x , Al 1− x Si x and Al 1− x Ge x systems is estimated from the specific heat at low temperatures and from the average elastic velocity. The Debye temperature decreases with the solubility of Cu, and even stronger with the extended solubility of Si and Ge.
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