= Solution
Reducing <void swelling> means delaying stable cavity growth and reducing its rate after incubation. Several approaches act on different parts of that mechanism.
Choose an alloy and initial <microstructure> with favorable <defect sink> populations. <Grain boundaries>, stable interfaces, precipitates and a controlled <dislocation> structure can remove mobile defects and promote recombination before they feed voids. The relevant quantity is sink efficiency and bias, rather than the number of visible microstructural features alone.
<Cold working> can increase the starting <dislocation density> and prolong incubation in suitable austenitic steels. <Irradiation> and thermal recovery can later change that structure, so an initial benefit need not persist indefinitely. Solute additions and controlled precipitation can also change <vacancy> mobility, defect trapping and cavity nucleation. Their effectiveness must be assessed together with <corrosion>, <ductility> and irradiation-assisted changes in composition.
Where other constraints permit, choose a more swelling-resistant material family, such as an appropriate ferritic-martensitic steel, rather than assuming every stainless steel has the response of an austenitic grade. This introduces its own tradeoffs in toughness, <temperature> window and compatibility.
Manage the operating <temperature> and accumulated dose to avoid the most unfavorable swelling regime, and account for transmutation-gas production. Neither simply minimizing <temperature> nor adding gas traps guarantees an improved component: the former can increase hardening and embrittlement, and gas-stabilized cavities can become nuclei for later swelling.
Useful comparisons require specimens with controlled composition and heat treatment, measured dose and <temperature> histories, and both dimensional measurements and <transmission electron microscopy>. Matching final dose alone does not establish that two <irradiation> conditions produce the same swelling.
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