Abstract
A study was conducted to better understand the roles of irradiation defects and cavities on the mechanical properties of 304 stainless steel. Micropillars were fabricated using focused ion beam techniques, and pillars were heat treated at 300°C to serve as a control, irradiated in situ to 5 dpa with 1 MeV krypton ions at 300°C, or pre-implanted with a specific amount of helium and then irradiated. Micropillars were compression tested in situ in a transmission electron microscope (TEM) using a picoindenter. The load–displacement curves were converted into stress–strain curves and mechanical properties were extracted. Irradiation hardening was observed with the yield stress being the highest in the pillar implanted with the least helium. TEM and energy-dispersive spectroscopy analysis showed the presence of irradiation-induced defects in krypton-irradiated samples and the presence of cavities.
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