1. Solidification and high-temperature phase equilibria in the Fe–Al-rich part of the Fe–Al–Nb system
- Author
-
Prymak, O. and Stein, F.
- Subjects
- *
TERNARY alloys , *SOLIDIFICATION , *PHASE equilibrium , *HIGH temperatures , *TERNARY phase diagrams , *INTERMETALLIC compounds , *SOLID solutions , *EUTECTICS - Abstract
Abstract: Partial isothermal sections of the Fe–Al–Nb phase diagram at 1000, 1170, and 1300°C as well as the corresponding part of the liquidus surface were established experimentally for Nb contents in the range from 0 to 33at%. This part of the phase diagram is characterized by an extended two-phase field of the (αFe) solid solution (disordered A2) or FeAl (ordered B2) with the Nb(Fe,Al)2 Laves phase. The solubility of Nb in all Fe–Al phases is small and reaches a maximum in the phase FeAl. A deep eutectic valley runs parallel to the Fe–Al axis across the large two-phase field and continues to the Al corner. The composition dependence of the eutectic temperature and the exact position of the eutectic valley on the liquidus surface including the Al-rich part were determined. The high-temperature phase equilibria are strongly affected by the liquid phase coming from the Al corner. With increasing temperature its phase field grows quickly into the ternary system resulting in a strongly reduced extension of the (αFe)+Nb(Fe,Al)2 two-phase field at 1300°C. [Copyright &y& Elsevier]
- Published
- 2010
- Full Text
- View/download PDF