Abstract
The influence of precipitates of the Ni3Al intermetallic compound on the accumulation of vacancy defects in the aged Fe–Ni–Al alloy upon electron irradiation has been studied by the method of positron annihilation spectroscopy. The samples of the alloy with different initial microstructures (quenched, aged under different conditions) were irradiated at temperatures of 300 and 423 K to a damaging dose of 5 × 10–4 displacements per atom (dpa), after which they were isochronously annealed in the temperature range of 300–850 K. The results obtained have shown that the presence of particles of the intermetallic precipitates leads to the retardation of the accumulation of vacancy defects. The rate of accumulation substantially depends on the irradiation temperature. Furthermore, the effect of precipitates depends on the size, density, and type of particles. An analysis of the experimental data has shown that this effect is caused by the presence of elastic stresses at the precipitate–matrix boundaries.
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