Experiments in high voltage electron microscopy. Progress report, October 31, 1975--August 1976 [electronic resource].
- Published
- Washington, D.C : United States. Energy Research and Development Administration, 1976.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- Pages: 17 : digital, PDF file
- Additional Creators
- Case Western Reserve University, United States. Energy Research and Development Administration, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- High voltage electron microscopy (HVEM) is being used to study the effects of irradiation on a variety of materials. The vacancies and interstitials produced by displacement can agglomerate to form dislocation loops and voids, annihilate at sinks, or enhance various diffusion processes such as precipitation and recrystallization. Threshold displacement energies, E/sub d/, have been determined for a number of fcc, bcc, and hcp metals. Directions for minimum E/sub d/ have been correlated with the crystal structure and the magnitude of E/sub d/ has been related to the sublimation energy. The effects of electron irradiation on precipitation in Al--Cu, Al--Si and Ni--Al alloys have been investigated. Precipitation respectively of theta', Si and ..gamma..' is enhanced and growth rates are being related quantitatively to theories of radiation-enhanced diffusion. Results on radiation damage in oxides (quartz, alumina, and magnesia) have also been obtained. Displacement damage gives rise to dislocation loop nucleation and growth in all cases, including multi-layer loops in Al/sub 2/O/sub 3/. In SiO/sub 2/, ionization damage also occurs, which destroys the crystallinity. Threshold displacement and temperature effects have also been investigated.
- Report Numbers
- E 1.99:coo-2119-17
coo-2119-17 - Subject(s)
- Other Subject(s)
- Electron Microscopy
- Aluminium Alloys
- Physical Radiation Effects
- Copper Alloys
- Aluminium Silicides
- Nickel Alloys
- Aluminium Oxides
- Silicon Oxides
- Magnesium Oxides
- Diffusion
- Interstitials
- Vacancies
- Alkaline Earth Metal Compounds
- Alloys
- Aluminium Compounds
- Chalcogenides
- Crystal Defects
- Crystal Structure
- Magnesium Compounds
- Microscopy
- Oxides
- Oxygen Compounds
- Point Defects
- Radiation Effects
- Silicides
- Silicon Compounds
- Note
- Published through SciTech Connect.
08/01/1976.
"coo-2119-17"
Das, G.; Barnard, R.; Mitchell, T. E.; Ro, D. - Funding Information
- E(11-1)-2119
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