Design of Ni-Base Superalloys
Computer models for designing Ni-base superalloys have been developed. A mathematical model using regression equations based on microstructure and property databases has been established and successfully applied to alloy developments. Several types of Ni-base superalloys including new generation single crystal (SC) superalloys have been designed using the model. Evaluation tests have shown their superior high temperature properties.
A theoretical modeling of equilibrium states in multi-component Ni-base superalloys has also become possible by employing statistical thermodynamics with using interatomic potentials, namely, cluster variation method (CVM). The γ and γ′ phase compositions, site occupations of alloying elements in the phases, lattice parameters, and so on were calculated self-consistently and successfully verified using atom-probe field ion microscopy (APFIM). The same set of interatomic potentials are used in Monte Carlo simulation (MCS) of microstructural evolution in multi-component Ni-base superalloys.
An open laboratory for materials design (OLMD), which enables one to use our computer models and databases within NRIM for superalloys, is now open to the public on our world wide web (WWW) site.
KeywordsMonte Carlo Simulation Creep Strength Site Occupancy Multiple Correlation Coefficient Lattice Misfit
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