Ti-Al-Zr系β固溶体中の1473Kにおける三元系拡散と原子間の熱力学的相互作用

抄録

The interdiffusion in Ti-rich β solid solutions in Ti-Al-Zr alloys has been investigated at 1473 K. In the β Ti-Al-Zr alloys, the main interdiffusion coefficients, and , and cross interdiffusion coefficients, and , have positive values in the ternary alloys, and they have slight concentration dependence. The values of are larger than those of . In the Ti-Al-X（＝V, Cr, Fe, Co, Zr） alloys, the values of main coefficients are ＜ ＜ ＜ ＜ at 1473 K. The repulsive interactions exist between Al and X（＝V, Cr, Fe, Co, Zr）atoms in the Ti-Al-X alloys, because the ratio values of cross coefficients to main one are positive in sign. On the other hand, the interactions between Ti （solvent） and X （＝V, Cr, Fe, Co, Zr）（or Al） atoms are attractive in the present alloys, since the ratio of converted interdiffusion coefficients in the ternary alloys show negative values.