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.
Striations are caused by metastable precipitates, not resolved by optical microscopy. Longitudinal section shows the alpha copper-rich solid solution phase with elongated grains as a result of cold working before precipitation hardening. Cobalt beryllide particles are observed uniformly dispersed throughout the matrix. Striations are caused by metastable precipitation within the alloy. The strengthening precipitates which form during precipitation heat treatment are not resolved by optical microscopy.