As-quenched microstructure of a Cu–14.6Al–4.3Ni alloy

In the as-quenched condition, the microstructure of the Cu–14.6Al–4.3Ni alloy is D03 phase containing extremely fine precipitates. Transmission electron microscopy examinations indicated that the extremely fine precipitates are L–J phase, rather than 2H phase. In addition, electron diffraction analyses indicated that the L–J precipitate has two variants with the D03 matrix. These results are quite different from those reported by other workers in a Cu–14.2Al–4.3Ni alloy.