Cyclic-loading-induced accumulation of geometrically necessary dislocations near grain boundaries in a an ni-based superalloy.
In this study, the fatigue-induced microstructure produced in a nickel-based polycrystalline superalloy that was subjected to cyclic loading was characterized by polychromatic x-ray microdiffraction (PXM) together with in-situ neutron diffraction and transmission-electron microscopy (TEM). In-situ neutron-diffraction measurements reveal two distinct stages of the fatigue damage: cyclic hardening followed by cyclic softening. Three-dimensional spatially resolved PXM micro-Laue measurements find an increase in the density of geometrically necessary dislocations near the grain boundaries, which is accompanied by lattice rotations and grain subdivisions. The PXM results are in agreement with the in-situ neutron-diffraction and TEM results.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); Ludo Frevel Crystallography Scholarship
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 977376
- Report Number(s):
- ANL//XSD/JA-66776; JOMMER; TRN: US201009%%720
- Journal Information:
- JOM, Vol. 61, Issue 12 ; 2009; ISSN 1047-4838
- Country of Publication:
- United States
- Language:
- ENGLISH
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Cyclic-loading-induced Accumulation of the Geometrically Necessary Dislocations Near the Grain Boundaries of the Ni-Based Superalloy
MULTI-SCALE DIFFRACTION STUDY OF REVERSIBLE/IRREVERSIBLE DEFORMATION MECHANISMS IN THE NI-BASED SUPERALLOYS DURING FATIGUE