Investigation of rapidly solidified dispersion-strengthened titanium alloys. Annual report, September 1985-August 1986

Technical Report · Wed Jul 01 00:00:00 EDT 1987

OSTI ID:5957882

Snow, D B

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

Related Subjects

36 MATERIALS SCIENCE
RARE EARTH ADDITIONS
METALLURGICAL EFFECTS
TITANIUM BASE ALLOYS
DISPERSIONS
ARGON
DYSPROSIUM
ELECTRON MICROSCOPY
ERBIUM
GADOLINIUM
HIGH TEMPERATURE
LABORATORIES
LANTHANUM
LUTETIUM
MARTENSITE
MICROSTRUCTURE
NEODYMIUM
OXIDES
QUENCHING
SOLID SOLUTIONS
SOLIDIFICATION
SPRAYS
STRESSES
SUPERSATURATION
TERBIUM
THICKNESS
YTTRIUM
YTTRIUM OXIDES
ALLOYS
CARBON ADDITIONS
CHALCOGENIDES
CRYSTAL STRUCTURE
DIMENSIONS
ELEMENTS
FLUIDS
GASES
IRON ALLOYS
METALS
MICROSCOPY
MIXTURES
NONMETALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RARE EARTH ALLOYS
RARE EARTHS
RARE GASES
SATURATION
SOLUTIONS
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties