| Summary: | The microstructure and mechanical properties of pure W, sintered and swaged W-1.5ZrO<sub>2</sub> composites after 1.5 × 10<sup>15</sup> Au<sup>+</sup>/cm<sup>2</sup> radiation at room temperature were characterized to investigate the impact of the ZrO<sub>2</sub> phase on the irradiation resistance mechanism of tungsten materials. It can be concluded that the ZrO<sub>2</sub> phase near the surface consists of two irradiation damage layers, including an amorphous layer and polycrystallization regions after radiation. With the addition of the ZrO<sub>2</sub> phase, the total density and average size of dislocation loops, obviously, decrease, attributed to the reason that many more glissile 1/2<111> loops migrate to annihilate preferentially at precipitate interfaces with a higher sink strength of 7.8 × 10<sup>14</sup> m<sup>−</sup><sup>2</sup><sub>.</sub> The swaged W-1.5ZrO<sub>2</sub> alloys have a high enough density of precipitate interfaces and grain boundaries to absorb large numbers of irradiated dislocations. This leads to the smallest irradiation hardening change in hardness of 4.52 Gpa, which is far superior to pure W materials. This work has a collection of experiments and conclusions that are of crucial importance to the materials and nuclear communities.
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