Impurity effects on the creep of polycrystalline magnesium and aluminum oxides at elevated temperatures. Technical progress report, December 19, 1978-December 18, 1979

Technical Report · Fri Nov 30 23:00:00 EST 1979

DOI:https://doi.org/10.2172/5588684· OSTI ID:5588684

Gordon, R S

Research is described on: the effect of mixed transition metal impurities (Fe-Ti, Mn-Ti, and Mg-Ti) on the steady state creep of polycrystalline aluminum oxide, stress relaxation deformation studies on polycrystalline MgO and Al/sub 2/O/sub 3/, pure and doped with iron, and the theoretical analysis of ambipolar diffusion taking into account interfacial defect creation and/or annihilation processes at grain boundaries, and impurity effects, particularly those with mixed dopants, on the diffusional creep of polycrystallina alumina can be completely explained provided Schottky defects are assumed to be the intrinsic defects in Al/sub 2/O/sub 3/.

• Research Organization: Utah Univ., Salt Lake City (USA). Div. of Materials Science and Engineering
• DOE Contract Number: EY-76-S-02-1591
• OSTI ID: 5588684
• Report Number(s): COO-1591-34
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CREEP
CRYSTAL STRUCTURE
DEFECTS
DIFFUSION
GRAIN BOUNDARIES
GRAIN SIZE
IMPURITIES
IRON ALLOYS
MAGNESIUM ALLOYS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MANGANESE ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SIZE
TITANIUM ALLOYS