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Title: Segregation at stacking faults within the γ′ phase of two Ni-base superalloys following intermediate temperature creep

Using state-of-the-art energy dispersive spectroscopy, it has been established for the first time that there exists significant compositional variation (enrichment of Co and Cr and deficiency of Ni and Al) associated with superlattice intrinsic stacking faults created in the ordered γ' precipitates following intermediate temperature deformation of two commercial superalloys. The results indicate that long range diffusion of these elements is intimately involved in the precipitate shearing process and is therefore closely linked to the time-dependent deformation of the alloys.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [1]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. FEI Company, Hillsboro, OR (United States)
  3. Univ. of Cambridge (United Kingdom)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
OSTI Identifier:
1166817
Report Number(s):
PNNL-SA--105000
Journal ID: ISSN 1359-6462; KP1704020
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Scripta Materialia; Journal Volume: 94; Journal Issue: C
Publisher:
Elsevier
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE