Hardness and depth-dependent microstructure of ion-irradiated MgAl/sub 2/O/sub 4 [electronic resource].
- Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1988.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 45 : digital, PDF file
- Additional Creators:
- Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- 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.
- Report Numbers:
- E 1.99:conf-880613-14
E 1.99: conf-880613-14
- Other Subject(s):
- Magnesium Oxides
- Radiation Hardening
- Transmission Electron Microscopy
- X-Ray Spectroscopy
- Alkaline Earth Metal Compounds
- Aluminium Compounds
- Aluminium Oxides
- Crystal Structure
- Electron Microscopy
- Magnesium Compounds
- Oxide Minerals
- Oxygen Compounds
- Physical Radiation Effects
- Radiation Effects
- Published through SciTech Connect.
14. international symposium on effects of radiation on materials, Andover, MA, USA, 27 Jun 1988.
- Funding Information:
View MARC record | catkey: 14753296