Ti–Al–Fe三元系合金のβ相中の相互拡散

抄録

The interdiffusion in Ti-rich β Ti–Al–Fe alloys has been investigated in the temperature range from 1323 to 1473 K. The main interdiffusion coefficients, D˜^Ti_AlAl and D˜^Ti_FeFe, and cross interdiffusion coefficients, D˜^Ti_AlFe and D˜^Ti_FeAl, have positive values in the ternary alloys, and they have slight concentration dependence. The values of D˜^Ti_FeFe are larger than those of D˜^Ti_AlAl, D˜^Ti_AlAl, and the values of D˜^Ti_FeAl are also larger than those of D˜^Ti_AlFe. The repulsive interactions exist between Al and Fe atoms in the Ti–Al–Fe alloys, because the ratio values of cross coefficient to main one are positive in sign. On the other hand, the interactions between Ti (solvent) and Al (or Fe) atoms are attractive in the present alloy, since the ratio of converted interdiffusion coefficients in the ternary alloys show negative values.