中性子照射したZr基金属ガラスの機械的特性

抄録

Neutron irradiation embrittlement behaviors of some Zr-Cu-Al and Zr-Cu-Ni-Al BMGs with various Zr-contents have been examined by Charpy impact tests under neutron fluences of 1~2 x 10²⁴ n/m² at relatively low and high temperatures of about 325 K and 550 K, respectively. In the case of the irradiation at 325 K, Charpy impact strength of Zr₄₅Cu₄₅Al₁₀ BMG increased from 59 kJ/m² up to 92 kJ/m² accompanied with decreasing the hardness. In the Zr-rich BMGs of Zr₅₀Cu₄₀Al₁₀, Zr₅₅Cu₃₀Ni₅Al₁₀, Zr₅₉Cu₃₁Al₁₀, Zr₆₅Cu₂₀Ni₅Al₁₀ and Zr₆₅Cu₁₈Ni₇Al₁₀, impact strengths decreased from about 90 kJ/m² down to about 30 kJ/m² with decreasing the hardness. In the case of the irradiation at 550 K, impact strengths of the Zr-rich BMGs maintained relatively high values of about 60 ~ 90 kJ/m². These results may be explained by amounts of excess free-volume in the neutron irradiated Zr-based BMGs.