Journal
ACTA MATERIALIA
Volume 48, Issue 16, Pages 4169-4177Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1359-6454(00)00197-X
Keywords
nickel alloys; creep; mesostructure; scanning electron microscopy (SEM); image analysis
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The evolution of the gamma/gamma' microstructure of the superalloy SRR99 during creep at 980 degreesC and 200 MPa has been characterised by Fourier analysis of scanning electron microscope images. Different kinetics of this process were found in the primary and secondary dendrite arms. Changes of the structure period and interface tilt are correlated with the accumulated creep strain. Possible mechanisms for the correlation of microstructural evolution and high-temperature creep deformation are discussed. (C) 2000 Elsevier Science Ltd. Published by Elsevier Science Ltd. All rights reserved.
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