Cyclic-loading-induced Accumulation of the Geometrically Necessary Dislocations Near the Grain Boundaries of the Ni-Based Superalloy

Journal Article · Wed Dec 31 23:00:00 EST 2008 · Journal of Metals

DOI:https://doi.org/10.1007/s11837-009-0181-9· OSTI ID:971590

Huang, E-Wen ^[1]; Barabash, Rozaliya ^[1]; Ice, Gene E ^[1]; Liu, Wenjun ^[1]; Liu, Yee-Lang ^[2]; Kai, Ji-Jung ^[2]; Liaw, Peter K ^[3]

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1. ORNL
2. National Tsing Hua University, Taiwan
3. University of Tennessee, Knoxville (UTK)

In this study, a nickel-based polycrystalline superalloy is subjected to cyclic loading. The fatigue-induced microstructure is characterized by novel polychromatic X-ray microdiffraction (PXM) together with in-situ neutron diffraction and TEM. In-situ neutron strain measurements reveal two distinct stages of the fatigue damage. Three-dimensional (3D) spatially-resolved PXM micro-Laue measurements demonstrate the development of local texture and formation 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: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 971590
• Journal Information: Journal of Metals, Journal Name: Journal of Metals Journal Issue: 12 Vol. 61; ISSN 0148-6608; ISSN JOMTAA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DISLOCATIONS
GRAIN BOUNDARIES
HEAT RESISTING ALLOYS
MICROSTRUCTURE
NEUTRON DIFFRACTION
NEUTRONS
STRAINS
TEXTURE
fatigue
neutron diffraction
x-ray microdiffraction