Solid State Amorphization and Alloy Parameters for High Entropy Alloys

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 0.5 TiZrPdCuNi 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 δ or Δ H mix , which have been widely used for predicting solid-solution formation in HEAs. All intermetallic compounds with Δ H mix ≤ -35 kJ/mol and those with δ ≥ 12.5 exhibit the occurrence of SSA. This implies that the intermetallic compounds with a largely negative Δ H mix value and a largely positive δ parameter are favorable for the occurrence of SSA.