Strength and modulus of a molybdenum-coated Ti-25Al-10Nb-3V-1Mo intermetallic

Journal Article · Fri Jan 31 23:00:00 EST 1997 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/s11665-997-0031-2· OSTI ID:455207

Vaidya, R U; Zurek, A K ^[1]; Wolfenden, A; Cantu, M W ^[2]

---

1. Los Alamos National Lab., NM (United States)
2. Texas A and M Univ., College Station, TX (United States)

Tl{sub 3}Al-based intermetallics show tremendous promise in high-temperature structural applications. These intermetallics have the potential to serve in a variety of environments, depending on the type of application, including jet turbines and internal combustion engine components. The three-point bend strength, Young`s modulus, and vibrational damping of a plasma-sprayed molybdenum-coated Ti-25Al-10Nb-3V-1Mo intermetallic were measured. The bend strength of the intermetallic samples was significantly reduced as a result of the molybdenum coating. This decrease in the strength was attributed to cracks formed in the molybdenum coating during the plasma spraying process. Experimental measurements done using the piezoelectric ultrasonic composite technique (PUCOT) indicated that the modulus and vibrational damping of the coated samples were significantly higher than for the uncoated substrates. Thermal cycling of the molybdenum-coated intermetallic between 600 C and room temperature revealed a saturation increase in the modulus with a corresponding decrease in the mechanical damping. This behavior was attributed to crack healing occurring in the molybdenum coating during the thermal cycling process.

• Sponsoring Organization: USDOE
• OSTI ID: 455207
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 1 Vol. 6; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CRACKS
DAMPING
FLEXURAL STRENGTH
HEAT RESISTING ALLOYS
INTERMETALLIC COMPOUNDS
INTERNAL COMBUSTION ENGINES
MECHANICAL PROPERTIES
MOLYBDENUM
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
PLASMA ARC SPRAYING
TITANIUM BASE ALLOYS
VANADIUM ALLOYS
YOUNG MODULUS