Mechanical properties of coated titanium Beta-21S after exposure to air at 700 and 800 C

Conference · Mon Jun 01 04:00:00 EDT 1992

OSTI ID:7143957

Wiedemann, K E; Bird, R K; Wallace, T A; Clark, R K

Mechanical properties of Beta-21S (Ti-15Mo-3Al-2.7Nb-0.2Si, wt percent) with glass, aluminide, and glass-on-aluminide coatings less than 3-micron thick were studied. Coatings were deposited by sol-gel processing or electron-beam evaporation onto 4.5-mil (113-micron) thick Beta-21S sheet from which, after oxidizing in air at 700 or 800 C, tensile test specimens were machined. Plastic elongation was the most severely degraded of the tensile properties; the glass-on-aluminide coatings were the most effective in preventing degradation. It was found that oxygen trapping by forming oxides in the coating, and reactions between the coatings and the Beta-21S alloy played significant roles.

• Research Organization: National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center
• OSTI ID: 7143957
• Report Number(s): N-92-30205; NASA-TM--104220; NAS--1.15:104220; CONF-920604--; CNN: RTOP 506-43-71-01
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
AIR
ALLOYS
ALUMINIUM ALLOYS
BEAMS
COATINGS
ELECTRON BEAMS
ELEMENTS
EVAPORATION
FLUIDS
GASES
GLASS
LEPTON BEAMS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
NONMETALS
OXYGEN
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PROTECTIVE COATINGS
SOL-GEL PROCESS
TENSILE PROPERTIES
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
TRAPPING