Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 683, Issue -, Pages 9-14Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.11.096
Keywords
Nickel-base superalloy; Dislocation dipole; HRTEM; A < 100 > superdislocation; Creep deformation
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Funding
- National Natural Science Foundation of China [50971078, 51071096, 51271097, 51471098]
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Dislocation substructures were investigated in a nickel-base single crystal superalloy subjected to 85 h creep at 1100 degrees C and 130 MPa using conventional and high resolution transmission electron microscopy. Both hexagonal and square-like interfacial dislocation networks were observed. The square-like networks, which were caused by two perpendicular sets of a/2 < 110 > dislocations forming a[100] superdislocations, were tested. It was concluded that the a[100] interfacial dislocation occurred in the form of a dislocation dipole. The creation and destruction of dislocation dipoles proceeded reversibly via a slip-and-climb mechanism.
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