Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 19-20, Pages 6225-6234Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.04.049
Keywords
Electron microscopy; Nickel based superalloys; Dislocations; Interfaces; Phase transformation
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Funding
- German Research Foundation (DFG) [PO 405/10-2, LI 494/4-2]
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A new method for the investigation of interfacial dislocations in nickel-base superalloys employing SEM has been recently established by the authors. The dislocations become visible because of grooves, which form in the gamma/gamma'-interface at the dislocation core. The groove formation mechanism was investigated by annealing/cooling experiments and creep experiments with the single-crystal superalloys SRR99 and CMSX-4. Possible forces for groove formation are discussed and their magnitude is estimated. The osmotic force, resulting from the vacancy supersaturation during quenching, was found to be the main reason for groove formation. The correlation between groove shape and Burgers vector of the interfacial dislocation is explained. The conditions required for observation of such grooves using SEM are discussed. (C) 2011 Elsevier B.V. All rights reserved.
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