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On phase transformations in a Ni-based superalloy

Asgari, S ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1080/14786435.2013.773106
  3. Publisher: 2013
  4. Abstract:
  5. In this study, a particular nickel-based superalloy has been studied by transmission electron microscopy and the results are discussed in terms of phase transformations that may have taken place. The alloy has been found to consist of three major phases; a FCC γ phase containing a random distribution of nearly spherical γ′ - Ni3Al(Ti) - precipitates and elongated thin Ni3Ti(Ta) platelets with a hexagonal structure. The orientation relationships between the different phases have been determined; loss of coherency and possible occurrence of misfit-relieving interfacial dislocations are discussed and compared with experimental observations, and possible mechanisms of phase transformations are also addressed
  6. Keywords:
  7. Interface ; Misfit dislocation ; Phase transformation ; Superalloy ; Coherency loss ; Experimental observation ; Hexagonal structures ; Interfacial dislocations ; Ni-based superalloys ; Nickel- based superalloys ; Orientation relationship ; Random distribution ; Dislocations (crystals) ; Interfaces (materials) ; Intermetallics ; Nickel ; Superalloys ; Tantalum ; Transmission electron microscopy ; Phase transitions
  8. Source: Philosophical Magazine ; Volume 93, Issue 10-12 , Mar , 2013 , Pages 1351-1370 ; 14786435 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1080/14786435.2013.773106