AS-QUENCHED CU-10.9 AT-PERCENT BE

Diffuse X-ray scattering, elastic and inelastic neutron scattering were examined to investigate the local atomic structure, static strains and phonon dispersion in a single crystal of a Cu-10. 9 at. % Be in the as-quenched state. There is a nearly regular array of small ellipsoidal Be-clusters aligned along LT AN BR 110 LT AN BR directions. (This array produces the tweed structure seen in TEM. ) The density of these clusters is 7. 5 multiplied by 10**2**6 m** minus **3. The LT AN BR h h 0 RT AN BR diffuse streaks seen in electron diffraction patterns are due mostly to thermal diffuse scattering. The phonon dispersion curves have no large differences from those of pure Cu except at the left bracket xi xi xi right bracket //T zone boundary where there is softening. This difference may be due to a Kohn anomaly. The elastic anisotropy increases with alloying, which probably leads to the plate-like GP zone morphology in subsequent aging treatments.