Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 483-84, Issue -, Pages 25-32Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.08.148
Keywords
creep; deformation mechanisms; Ni-base superalloy; microtwinning
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This paper reviews the presently proposed mechanisms for creep of gamma' strengthened Ni-base superalloys that are typically used for disk applications. Distinct creep strength controlling modes, such as dislocation-coupled antiphase-boundary shearing, shearing configurations involving superlattice stacking faults, Orowan looping, climb by-pass, and microtwinning have been observed. These are strongly influenced by the scale of the gamma' precipitating phase and are operative within specific ranges of temperature and stress. Insight from more recent experimental findings concerning microtwinning and extending stacking fault mechanisms suggest important similarities between these deformation modes. It is suggested that local atomic reordering in the wake of Shockley partials is responsible for the temperature dependence exhibited in this regime. (C) 2007 Elsevier B.V. All rights reserved.
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