VIa — Metalle

Thermodynamic evaluation of the Nb–O–Zr system

“…The computed solubilities of oxygen in Nb-2 at.% Zr and Nb-5 at.% Zr together with the experimental data of Jehn and Ortali [28] are shown in Fig. 17.…”

“…[25][26][27]. However, it is not clear if the experimental data by [28] really represent the oxygen content in b-Nb or the overall oxygen composition in the two-phase field b-Nb + ZrO 2 at some unknown oxygen potential. In Fig.…”

“…In Refs. [25][26][27][28], it was experimentally established that the addition of zirconium drastically would decrease the oxygen solubility in b-Nb. The solubility data reported in Refs.…”

“…The solubility of oxygen in the Nb-rich part of the Nb-Zr system has been determined by Jehn and Ortali [28] using a quantitative metallographic technique. Their data, indicate the relation…”

“…The oxygen solubility versus reciprocal temperature in Nb-Zr alloys for Nb-5 at.% Zr and Nb-2 at.% Zr (calculated dashed and solid lines) compared with the experimental data (x = Nb-5 at.% Zr, D = Nb-2 at.% Zr) by Jehn and Ortali[28]. Calculated isothermal section of the Nb-O-Zr system at 1773 K. Measured data are from[29] (d = three-phase region, s = two-phase region).…”