Fe₂Zrの熱的及び機械的性質

抄録

　Following the accident at the Fukushima Daiichi Nuclear Power Plant in 2011, fuel debris formed in the reactor. It is important to understand the thermal and mechanical properties of the fuel debris. The fuel debris mainly consists of oxide, boride, and metallic phases. Although the physical properties of the oxide and boride phases have been widely investigated, those of the metallic phase have not been deeply studied. Here, we focus on Fe₂Zr, which is considered to be the main component of the metallic phase. Ingots of Fe₂Zr were synthesized by arc melting, then the ingots were crushed to powders, which was followed by spark plasma sintering to obtain high-density polycrystalline bulk samples. The thermal and mechanical properties such as thermal expansion coefficient, specific heat capacity, thermal diffusivity, thermal conductivity, sound velocity, elastic moduli, and Vickers hardness were examined, and the obtained data were compared with the literature data on the oxide and boride phases to obtain an overall understanding of the properties of the fuel debris.