Abstract
A comprehensive study was performed on the microstructure of supersaturated and undersaturated Cu-3.4 at% Be solid solutions following irradiation with 14 MeV Cu ions. CuBe precipitates, which formed quickly during irradiation at 575–750 K, were characterized quantitatively by transmission electron microscopy (TEM). Precipitate size, number density, and crystallography were determined from specimens irradiated to doses of 0.25–10 dpa at a dose rate of about 10 −3 dpa/s. Some effects of dose-rate observed using a cross-sectional TEM thinning technique are also reported here. From the TEM data, the fraction of precipitated solute was found to be greatest at 665–695 K, i.e. near the equilibrium solvus temperature and near the temperature where irradiation-induced solute segregation is predicted to be most efficient. Crystallographically, the precipitate platelets shared characteristics of both the γ-CuBe equilibrium phase and the γ'-CuBe intermediate phase. Post-irradiation annealing studies indicated that the fine-particle morphology induced by irradiation was unstable during annealing even at a temperature below the equilibrium solvus.
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