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The role of interfacial dislocation networks in high temperature creep of superalloysThe dislocation networks generated during high-temperature creep of several single-crystal nickel-based superalloys are analyzed. The networks continually evolve during creep at relatively low temperatures or eventually reach a more stable configuration at high temperatures. Specifically, the role of these networks in directional coarsening processes are studied, along with their formation kinetics, characteristics, and stability during creep. The results of this study combined with previous findings suggest that the directional coarsening process is strongly influenced by elastic strain energy. The dislocation networks formed during primary creep are found to be stable during all subsequent creep stages. Aspects of these dislocation networks are determined to be a product of both the applied creep stress and coherency strains.
Document ID
19900046274
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gabb, T. P.
(NASA Lewis Research Center Cleveland, OH, United States)
Draper, S. L.
(NASA Lewis Research Center Cleveland, OH, United States)
Hull, D. R.
(NASA Lewis Research Center Cleveland, OH, United States)
Mackay, R. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Nathal, M. V.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Materials Science and Engineering, Part A - Structural Materials: Properties, Microstructure and Processing
Volume: A118
ISSN: 0921-5093
Subject Category
Metallic Materials
Accession Number
90A33329
Distribution Limits
Public
Copyright
Other

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