Hardness and depth-dependent microstructure of ion-irradiated MgAl/sub 2/O/sub 4/
Conference
·
OSTI ID:7020146
Stoichiometric polycrystalline magnesium aluminate spinel has been irradiated at 25 and 650/degree/C with 2.4 MeV Mg/sup plus/ ions to a fluence of 1.4 /times/ 10/sup 21/ ions/m/sup 2/ (/approximately/35 dpa peak damage level). Microindentation hardness measurements and transmission electron microscopy combined with energy dispersive X-ray spectroscopy measurements were used to characterize the irradiation effects. The room-temperature hardness of spinel increased by about 5% after irradiation at both temperatures. There was no evidence for amorphization at either irradiation temperature. Interstitial-type dislocations loops lying on /l brace/110/r brace/ and /l brace/111/r brace/ planes with <110> Burgers vectors were observed at intermediate depths (/approximately/1 ..mu..m) along the ion range. The <110>/l brace/111/r brace/ loops are presumably formed from <110>/l brace/111/r brace/ loops as a result of a shear on the anion sublattice. Only about 0.05% of the calculated displacements were visible in the form of loops, which indicates that spinel has a high resistance to aggregate damage accumulation. The peak damage region contained a high density of dislocations tangles. There was no evidence for the formation of voids or vacancy loops. The specimen irradiated at 650/degree/C was denuded of dislocation loops within /approximately/1 ..mu..m of the surface. 25 refs., 16 figs., 5 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7020146
- Report Number(s):
- CONF-880613-14; CONF-880613-14; ON: DE88012497
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
HARDENING
IMPURITIES
IRRADIATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSCOPY
MICROSTRUCTURE
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATION HARDENING
SPECTROSCOPY
SPINELS
SWELLING
TRANSMISSION ELECTRON MICROSCOPY
VOIDS
X-RAY SPECTROSCOPY
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
HARDENING
IMPURITIES
IRRADIATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSCOPY
MICROSTRUCTURE
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATION HARDENING
SPECTROSCOPY
SPINELS
SWELLING
TRANSMISSION ELECTRON MICROSCOPY
VOIDS
X-RAY SPECTROSCOPY