Evolution of interfacial dislocation network during anisothermal high-temperature creep of a nickel-based superalloy

  • Hantcherli M
  • Pettinari-Sturmel F
  • Viguier B
 et al. 
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Abstract

The effect of thermal cycling creep on the dislocation networks at the γ/γ′ interfaces in the MC2 superalloy is investigated. Tensile creep tests were performed under thermal cycling and isothermal conditions at low stress (80 MPa) and high temperature (1150 °C). In these conditions γ′ rafts may dissolve and reprecipitate during thermal cycling creep. The difference between the effects of isothermal and thermal cycling conditions on the γ/γ′ interface dislocation networks, characterized by transmission electron microscopy, is exposed, as well as their evolution during the cycle. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Interfacial dislocations
  • MC2
  • Single-crystal superalloy
  • TEM
  • Thermal cycling creep

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