Investigation of rapidly solidified dispersion-strengthened titanium alloys. Annual report, September 1985-August 1986
Significant potential exists for the improvement of high-temperature strength in titanium-base alloys by the addition of rare earth elements, followed by rapid solidification and aging. To investigate this potential, the relative effectiveness with which several different rare earth elements form oxide dispersions in splat-quenched Ti-AI solid solutions was examined, using Ti-A-Er as a basis of comparison. The alloying elements of this type utilized included yttrium, lanthanum, neodymium, gadolinium, terbium, dysprosium, erbium and lutetium, added individually in amounts of approx. 0.5 at % each. Procedures were developed to prepare rapidly solidified laboratory quantities of these alloys by arc melting and splat quenching in the same apparatus, followed by aging in high-purity argon. The dispersions formed in these alloys both before and after aging at 800 C were examined and compared by analytical transmission electron microscopy. While it was not generally possible to completely suppress the precipitation of intercellular oxides by splat quenching to thicknesses of greater than 60 micrometers, in all cases most of the yttrium or the rare earth component of the alloy was retained in supersaturated solid solution.
- Research Organization:
- United Technologies Research Center, East Hartford, CT (USA)
- OSTI ID:
- 5957882
- Report Number(s):
- AD-A-183882/0/XAB; UTRC/R-87-917553-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ARGON
CARBON ADDITIONS
CHALCOGENIDES
CRYSTAL STRUCTURE
DIMENSIONS
DISPERSIONS
DYSPROSIUM
ELECTRON MICROSCOPY
ELEMENTS
ERBIUM
FLUIDS
GADOLINIUM
GASES
HIGH TEMPERATURE
IRON ALLOYS
LABORATORIES
LANTHANUM
LUTETIUM
MARTENSITE
METALLURGICAL EFFECTS
METALS
MICROSCOPY
MICROSTRUCTURE
MIXTURES
NEODYMIUM
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
QUENCHING
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RARE EARTHS
RARE GASES
SATURATION
SOLID SOLUTIONS
SOLIDIFICATION
SOLUTIONS
SPRAYS
STRESSES
SUPERSATURATION
TERBIUM
THICKNESS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM
YTTRIUM COMPOUNDS
YTTRIUM OXIDES