|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Phase Stability and Kinetics in Ni-superalloys from First Principles
||John Goiri, Anton Van der Ven
|On-Site Speaker (Planned)
Nickel based superalloys are widely used in gas turbine engines due to their mechanical strength, oxidation and creep resistance. Turbine blades, which are exposed to high temperature environments that often limit their lifetime, require design to maximize resistance to heat and oxidation. Thermodynamic properties of these superalloys can be calculated from first principles. This is done by combining an effective Hamiltonian with statistical mechanics to yield free energies. These free energies give a complete equilibrium description of multicomponent alloy systems. The oxide layer at the surface of the superalloy grows by outward diffusion of Al, contributing to the eventual failure of the blade. Effective Hamiltonians can also be applied to predict the kinetics in the interdiffusion zone of the blade. Understanding the effects of composition and operating conditions on phase stability and diffusion is critical for alloy design.
||Planned: A print-only volume