|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Hume-Rothery Symposium: Accelerated Measurements and Predictions of Thermodynamics and Kinetics for Materials Design and Discovery
||A Thermodynamic and Molar Volume Database for Co-base Superalloys
||Ursula R. Kattner, Peisheng Wang
|On-Site Speaker (Planned)
||Ursula R. Kattner
The properties of both gamma/gamma’ Ni-base and Co-base superalloys are mainly the result of the characteristic gamma/gamma’ microstructure. However, the temperature ranges for the stability of the gamma’ phase are to a large extent different between these two alloy families. Knowledge of the phase equilibria in these systems is essential for the identification of promising alloy candidates and their processing requirements. The CALPHAD method is a well-established tool for obtaining such information. While free thermodynamic databases are available for Ni-base superalloys none is currently available for Co-base superalloys. As part of the CHiMaD/NIST project, a database for Co-base gamma/gamma’ superalloys is being developed. The database will include description of the Gibbs energy and molar volume as functions of temperature and composition. The model parameters are assessed using data from experimental measurements and theoretical predictions, such as density functional theory. This presentation will report on the current state of the database.