Analysis of dislocation networks in crept single crystal nickel-base superalloy

Analysis of dislocation networks in crept single crystal nickel-base superalloy The creep behaviour at 1050 °C of <001> oriented MC2 single crystals is analysed by means of SEM and TEM observations. The γ–γ′ rafting process occurs rapidly and appears to be correlated with the establishment of a pseudo-stationary creep stage. The regular and stable networks are seen in the (001) interfaces. A detailed analysis of dislocation networks in these (001) interfaces shows that they are constituted by an association of hexagonal and square cells of a/2 <110> dislocations. The square part is unstable and gives rise to the systematic creation of a <001> dislocations included in the misfit dislocation network. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Analysis of dislocation networks in crept single crystal nickel-base superalloy

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-017-1699-9
Publisher site
See Article on Publisher Site

Abstract

The creep behaviour at 1050 °C of <001> oriented MC2 single crystals is analysed by means of SEM and TEM observations. The γ–γ′ rafting process occurs rapidly and appears to be correlated with the establishment of a pseudo-stationary creep stage. The regular and stable networks are seen in the (001) interfaces. A detailed analysis of dislocation networks in these (001) interfaces shows that they are constituted by an association of hexagonal and square cells of a/2 <110> dislocations. The square part is unstable and gives rise to the systematic creation of a <001> dislocations included in the misfit dislocation network.

Journal

Journal of Materials ScienceSpringer Journals

Published: Oct 20, 2017

References

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