Evaluation of the thermodynamic properties of the Re-Ta and Re-W systems

The phase equilibria and thermodynamic properties of the Re-Ta and Re-W sys tems were analyzed and complete thermodynamic descriptions of the two binar y systems were obtained with the CALPHAD technique using a computerized opt imization procedure. The thermodynamic descriptions of pure Re, Ta and W el ements were taken from the SGTE database. Two binary intermetallic compound s were considered in both binary systems, namely sigma phase and chi phase based on available experimental data. Good agreement was obtained between c alculated results and experimental data in the two binary systems. (C) 2000 Elsevier Science S.A. All rights reserved.