Experimental Determination and Thermodynamic Description of the Fe–Nb–Zr System

In the Fe–Nb–Zr system, six primary solidification regions were identified in liquidus surface projection by analyzing microstructure and phase constituents of 26 as-cast alloys. 5 three-phase equilibria and 7 two-phase areas were determined by phase constituents of 24 equilibrated alloys at 1273 K. The solubility of Nb in Fe23Zr6 and λ2 at 1273 K was ~ 0.7 and 9.0 at. %, respectively. The solubility of Zr in μ and λ1 at 1273 K was ~ 8.1 and 38.4 at. %, respectively. The compound t with NiTi2 structure was confirmed to be stable at 1273 K, and the homogeneity range of Nb was ~ 10.1 to 16.8 at. %. Combining the experimental results in literature and the current study, the Fe–Nb–Zr system was assessed by CALPHAD method. A set of self-consistent reliable thermodynamic parameters was derived.

Keywords: Fe-Nb-Zr system, Experimental isothermal section, Liquidus surface projection, CALPHAD method

Suggested Citation: Suggested Citation

Cao, Ziyu and Zou, Lei and Zheng, Huimin and Guo, Cuiping and Li, Changrong and Du, Zhenmin, Experimental Determination and Thermodynamic Description of the Fe–Nb–Zr System. Available at SSRN: https://ssrn.com/abstract=5040875 or http://dx.doi.org/10.2139/ssrn.5040875