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In Situ Deformation at 850°C of Standard and Rafted Microstructures of Nickel Base Superalloys

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Abstract:

An in situ study of the plastic deformation of <001> single crystals of an industrial superalloy has been performed at 850 °C in a TEM to observe directly the micromechanisms which control the deformation under the actual temperature and stress conditions experienced by this material in aeroengines. A comparison between the creation and propagation modes of moving dislocations in the standard microstructure after annealing and the rafted microstructure after 20 h of creep at 1050°C evidence the important role of the width of the γ channels as well as the strength of the γ/γ’ interface in controlling the shearing events of γ’ channels.

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Periodical:

Materials Science Forum (Volume 509)

Pages:

57-62

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.509.57

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Online since:

March 2006

Authors:

Nicole Clément, Mustafa Benyoucef, M. Legros, Pierre Caron, Armand Coujou

Keywords:

Creep, Dislocation, Nickel Superalloy, Plastic Deformation Mechanisms, Rafted Microstructure

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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