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Development of a Diffusion Mobility Database for Ni-Base Superalloys

Published

Author(s)

Carelyn E. Campbell, William J. Boettinger, Ursula R. Kattner

Abstract

For a wide variety of Ni-base superalloy applications, including solidification, homogenization, y precipitation, bonding and repairing processes, and protective bond coats, multicomponent diffusion data are needed. Thus, in the Ni-Al-Co-Cr-Hf-Mo-Re-Ta-Ti-W system, diffusion data in the various binary and ternary systems were assessed for the fcc phase. These assessments were combined with data from various assessment in the literature to develop a diffusion mobility database. The diffusion assessments relied on existing thermodynamic databases for the calculation of needed thermodynamic factors. Evaluation of the current assessment work employed the well-known diffusion correlation that the diffusivity at the melting temperature is relatively constant for pure metals. Comparison calculated and measured diffusion coefficients in the Ni-Co-Cr-Mo and Ni-Al-Cr-Mo systems demonstrated the ability of the database to extrapolate to higher order systems. Finally, the mobility database, in conjunction with an available thermodynamic database and a finite-difference diffusion code, was used to simulate a multicomponent diffusion couple between CMSX-4 and Rene-N4.
Citation
Acta Materialia
Volume
50
Issue
No. 4

Keywords

interdiffusion coefficients, multi-component diffusion, nickel-based superalloys

Citation

Campbell, C. , Boettinger, W. and Kattner, U. (2002), Development of a Diffusion Mobility Database for Ni-Base Superalloys, Acta Materialia (Accessed July 19, 2024)

Issues

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Created February 1, 2002, Updated February 17, 2017