Characterization of Phase Chemistry and Partitioning in a Family of High-Strength Nickel-Based Superalloys

A family of novel polycrystalline Ni-based superalloys with varying Ti:Nb ratios has been created using computational alloy design techniques, and subsequently characterized using atom probe tomography and electron microscopy. Phase chemistry, elemental partitioning, and γ ′ character have been anal...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2018-06, Vol.49 (6), p.2302-2310
Main Authors: Lapington, M. T., Crudden, D. J., Reed, R. C., Moody, M. P., Bagot, P. A. J.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Concentration (composition)
Electron microscopy
Materials Science
Metallic Materials
Metallurgy
Nanotechnology
Nickel
Nickel base alloys
Niobium
Partitioning
Predictions
Structural Materials
Superalloys
Surfaces and Interfaces
Thin Films
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Summary:A family of novel polycrystalline Ni-based superalloys with varying Ti:Nb ratios has been created using computational alloy design techniques, and subsequently characterized using atom probe tomography and electron microscopy. Phase chemistry, elemental partitioning, and γ ′ character have been analyzed and compared with thermodynamic predictions created using Thermo-Calc. Phase compositions and γ ′ volume fraction were found to compare favorably with the thermodynamically predicted values, while predicted partitioning behavior for Ti, Nb, Cr, and Co tended to overestimate γ ′ preference over the γ matrix, often with opposing trends vs Nb concentration.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-018-4558-7