= Solution
\b[<Void swelling> is generally favored by an intermediate <irradiation temperature> window.] The balance involves defect mobility, stable <nucleation>, absorption at <defect sinks> and thermal emission; a larger <vacancy> population alone does not guarantee a larger void.
At low <temperature>, <vacancy> migration is slow. <Self-interstitials> may migrate and form <dislocation loops>, and small clusters can cause considerable <irradiation hardening>, while vacancies cannot readily feed large growing cavities. Defects retained in the matrix can evolve during later heating.
At intermediate <temperature>, <vacancies> can migrate far enough to reach stable cavities. <Interstitial bias> and the competition among <defect sinks> sustain a net vacancy flux into these cavities. Once the incubation period has produced suitable nuclei and sink populations, substantial <void swelling> can develop.
At high <temperature>, the <thermal equilibrium> vacancy population and vacancy emission from small cavities rise. A small void's curvature further favors emission, so maintaining stable nuclei becomes harder. Recovery changes the <dislocation> population, and recombination, gas transport and evolving precipitates also change the flux balance. The irradiation-driven <vacancy supersaturation> can fall, suppressing void <nucleation> and net swelling. Existing cavities may still coarsen, and gas bubbles, <material creep> and other damage can remain important.
Thus \b[low-temperature defect retention, intermediate-temperature cavity growth and high-temperature recovery/emission are different regimes]. The boundaries depend on <alloy> composition, initial <microstructure>, gas production, accumulated <displacements per atom> and <displacement dose rate>. No alloy-independent peak <temperature> can be inferred from the paper's data.
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