Characterization of W-based materials used in extreme high heat load irradiation environments

Wakai, Eiichi  ; Noto, Hiroyuki*; Kano, Sho*; Makimura, Shunsuke*; Ishida, Taku*; Shibayama, Tamaki*

It is important for materials and devices that are subjected to high-energy particle beams to be able to withstand high thermal loads and irradiation. In this study, we investigated the irradiation resistance of nanoparticle-dispersed W (tungsten) and 1.1 wt% TiC-doped nanoparticle-dispersed W materials with a grain size of 1-2 m and high strength, which were fabricated by mechanical alloying and high-temperature isostatic sintering. The irradiation was carried out at the HIT ion irradiation facility at the University of Tokyo at 773 K to about 0.7 dpa using tungsten ions, which are self ions. After the irradiation, the irradiation resistance of the materials was measured using a nanoindenter, and the results showed that the former material changed, while the latter material did not show any irradiation hardening.