Thermal properties of various intermetallic compounds subjected to mechanical grinding.

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  • 種々の金属間化合物のメカニカル・アロイング
  • シュジュ ノ キンゾクカン カゴウブツ ノ メカニカル アロイング

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Intermetallic compounds NiZr and Cu5Zn8 with good and poor glass-forming abilities were subjected to mechanical grinding, MG, under Ar atmosphere. MG should involve a process which raises the free energy of the system and may result in amorphization. In order to study this process we estimated the enthalpy changes in the DSC measurement, which are considered to reflect the sum of the heat release due to crystallization of an amorphous phase and dissipation of the strain energy stored in ball-milling. A mixture of pure metal powders Cu and Ta was also chosen for this study, the binary system of which gives rise to a positive heat of mixing and, hence may involve the same energizing process as MG above mentioned. In NiZr and Cu30Ta7O, the DSC profile including the peak position and the area, is found to change with increasing milling time. On the other hand, Cu5Zn8 behaved in a different manner and the heat release only due to the dissipation of the strain energy is observed.

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