Stability of. gamma. ' and. gamma. '' in inconel 706 under neutron irradiation
Inconel 706, a commercial ..gamma..'-..gamma..'' hardenable Fe-Ni-Cr base superalloy was examined by transmission electron microscopy after neutron irradiation up to 15 x 10/sup 22/n/cm/sup 2/, E > 0.1 MeV, at 400 to 735/sup 0/C. Compared with other ..gamma..'-hardened superalloys, this alloy is exceptionally resistant to irradiation-induced swelling and creep. Phase instabilities found after irradiation include the replacement of ..gamma..'' by ..gamma..' at 400 to 500/sup 0/C, and redistribution of ..gamma..' and ..gamma..'' to irradiation-induced dislocations at 550 to 650/sup 0/C. These instabilities are shown to result from segregation of nickel and niobium to point defect sinks. The dislocations formed during irradiation are extrinsic Frank partial loops which grow within ..gamma..'; stacking faults produced by growth of these dislocations are identifical to thin sheets of eta-phase.
- Research Organization:
- Hanford Engineering Development Lab., Richland, WA (USA)
- DOE Contract Number:
- AC14-76FF02170
- OSTI ID:
- 6606856
- Report Number(s):
- HEDL-SA-2161
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
CHROMIUM ALLOYS
CREEP
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
INCONEL 706
INCONEL ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
PHASE TRANSFORMATIONS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SWELLING