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Microstructure-property relationships in directionally solidified single-crystal nickel-base superalloysThis paper discusses some of the microstructural features which influence the creep properties of directionally solidified and single-crystal nickel-base superalloys. Gamma prime precipitate size and morphology, gamma-gamma (prime) lattice mismatch, phase instability, alloy composition, and processing variations are among the factors considered. Recent experimental results are reviewed and related to the operative deformation mechanisms and to the corresponding mechanical properties. Special emphasis is placed on the creep behavior of single-crystal superalloys at high temperatures, where directional gamma (prime) coarsening is prominent, and at lower temperatures, where gamma (prime) coarsening rates are significantly reduced. It can be seen that very subtle changes in microstructural features can have profound effects on the subsequent properties of these materials.
Document ID
19880053102
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mackay, Rebecca A.
(NASA Lewis Research Center Cleveland, OH, United States)
Nathal, Michael V.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Subject Category
Metallic Materials
Accession Number
88A40329
Distribution Limits
Public
Copyright
Other

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