Longitudinal section shows equiaxed grains of supersaturated alpha phase, solid solution of beryllium in copper. Cobalt beryllide particles which do not dissolve during solution annealing are observed. Longitudinal section shows equiaxed alpha grains and the cobalt beryllide phase uniformly dispersed throughout the matrix. The strengthening precipitates which result from precipitation heat treatment are not resolved by optical microscopy. Small amounts of equilibrium gamma phase are present in the grain boundaries.
Longitudinal section shows roughly equiaxed grains of alpha copper-rich solid solution matrix phase.
Small cobalt beryllide particles are uniformly dispersed throughout the matrix. Strengthening precipitates which form during precipitation heat treatment are not resolved by optical microscopy. The structure shows equiaxed grains of alpha phase and equilibrium gamma precipitates in the grain boundaries, which appear as dark nodules in a light matrix. Striations in alpha matrix are the result of concurrent metastable precipitate formation, not optically resolvable. Longitudinal section shows elongated grains of alpha phase and cobalt beryllides.