Formation of dispersions of rare earth oxides in titanium alloys using rapid solidification processing

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5784217

Konitzer, D G

Rapid solidification processing (RSP) was used to produce extended solid solutions of rare earth elements and O in Ti, and some of its alloys. RSP was effected by laser surface melting, and the resulting microstructures were characterized using the various techniques associated with analytical transmission electron microscopy. Heat treatment, typically 10 h at approx.1000 K results in the formation of an ultrafine dispersion of rare earth oxides. In the case of Er/sub 2/O/sub 3/, The particles are approx.8.20 nm in diameter with a mean interparticle spacing of 120 nm. Considerable effort was placed on the unambiguous identification of these small second phase particles. Convergent beam electron diffraction was used to determine the point and space groups of these precipitates and the results are consistent with these being m3 and la3, respectively, which are identical with those of the rare earth oxides Y/sub 2/O/sub 3/, Er/sub 2/O/sub 3/. The orientation relationships (OR) exhibited by these oxide particles were studied.

• Research Organization: Illinois Univ., Urbana (USA)
• OSTI ID: 5784217
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOYS
CHALCOGENIDES
CRYSTAL STRUCTURE
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
ERBIUM COMPOUNDS
ERBIUM OXIDES
HEAT TREATMENTS
HIGH TEMPERATURE
METALS
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHASE TRANSFORMATIONS
RARE EARTH COMPOUNDS
SOLIDIFICATION
TITANIUM
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES