Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Plastic deformation in oxide ceramics. Final report

Technical Report ·
OSTI ID:6445789
Plastic deformation in two non-stoichiometric oxide system - oxygen-rich UO/sub 2+x/ and Al-rich Mg-Al spinels, has been studied. In spinel, both stoichiometric and nonstoichiometric crystals were deformed at elevated temperatures and climb and climb-dissociation of <110> dislocation was ubiquitous. However, the marked composition-softening in this system, Al-rich crystals being much easier to deform than stoichiomeric crystals, was attributed to an intrinsic decrease of the stacking fault energy for glide dissociation with increasing Al/Mg ratio. In UO/sub 2+x/, the effects of O/U ratio on single crystals oriented either to suppress or promote (100)<110> slip are described. Either (111)<110> or (100)<110> slip can occur; the former is favored at low temperatures and high O/U ratios. The critical resolved shear stress for (111) slip decreases with increasing O/U ratio, while that for (100) slip is nearly constant with O/U ratio. Defect complexes are present in such oxygen-rich crystals and may re-orient in the stress fields of moving dislocations. This and their possible role in scavenging other impurity defects are believed to be involved in the variation of flow stress with O/U ratio.
Research Organization:
Case Western Reserve Univ., Cleveland, OH (USA). Dept. of Metallurgy and Materials Science
DOE Contract Number:
AC02-77ER04217
OSTI ID:
6445789
Report Number(s):
DOE/ER/04217-7; COO-4217-7; ON: DE83011047
Country of Publication:
United States
Language:
English

Similar Records

Plastic deformation in oxide ceramics. Progress report, January 1, 1981-December 31, 1981
Technical Report · Sat Aug 01 00:00:00 EDT 1981 · OSTI ID:5902454
Plastic deformation of single crystal UO/sub 2 + x/
Thesis/Dissertation · Thu Dec 31 23:00:00 EST 1981 · OSTI ID:6249936
Plastic deformation in oxide ceramics. Progress report, January 1, 1977--December 31, 1977
Technical Report · Thu Sep 01 00:00:00 EDT 1977 · OSTI ID:5379180

Related Subjects

050700 -- Nuclear Fuels-- Fuels Production &amp; Properties
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
&amp; Refractories-- Mechanical Properties
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTALS
DEFORMATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
MINERALS
MONOCRYSTALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLASTICITY
SHEAR PROPERTIES
SLIP
SPINELS
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES