Abstract
The phonon dispersion relation of ζ00 T branch of Al-1.8 at.% Cu has been measured by means of neutron inelastic scattering. A single crystal specimen aged at room temperature between 17 and 72 hr. after quenching from 550°C shows a strong resonance mode at the energy of about 2.5 THz. This resonance mode cannot be explained by the calculation based on the simple mass-defect model, and may be attributed to the formation of the Guinier- Preston zone.
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