永瀬 丈嗣

Fast electron irradiation can induce the solid-state amorphization (SSA) of many intermetallic compounds. The occurrence of SSA stimulated by fast electron irradiation was found in the Al_0.5TiZrPdCuNi high-entropy alloy (HEA). The relationship between the occurrence of SSA in intermetallic compounds under fast electron irradiation and the empirical alloy parameters for predicting the solid-solution-formation tendency in HEAs was discussed. The occurrence of SSA in intermetallic compounds was hardly predicted, only by the alloy parameters of <italic>δ</italic> or Δ<italic>H</italic>_mix, which have been widely used for predicting solid-solution formation in HEAs. All intermetallic compounds with Δ<italic>H</italic>_mix ≤ -35 kJ/mol and those with <italic>δ</italic> ≥ 12.5 exhibit the occurrence of SSA. This implies that the intermetallic compounds with a largely negative Δ<italic>H</italic>_mix value and a largely positive <italic>δ</italic> parameter are favorable for the occurrence of SSA.