Effect of elevated temperature exposure on cast gamma titanium aluminide (Ti-48Al-2Cr-2Nb)

Journal Article · Sun May 01 04:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90322-0· OSTI ID:5160553

Kelly, T J; Austin, C M; Fink, P J; Schaeffer, J ^[1]

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1. GE Aircraft Engines, Cincinnati, OH (United States)

In order to effectively replace the nickel-base alloys currently in use, cast gamma alloys must possess a wide range of mechanical property capabilities, including tensile strength, ductility, fracture toughness, fatigue strength and creep resistance. These properties must be retained after exposure to the high temperature environment of gas turbines. One phenomenon that has surfaced recently is the effect of moisture and hydrogen on tensile ductility. Prior to the work reported here, it had not been determined if these effects occur in alloys such as Ti-48Al-2Cr-2Nb. The function of the Cr and Nb is to improve strength, ductility, creep resistance and oxidation resistance. The results show that both ductility-reducing phenomena do indeed occur in Ti-48Al-2Cr-2Nb, and that they can interact to sharply lower room temperature ductility after surprisingly modest exposures.

• OSTI ID: 5160553
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 30:9; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
DATA
DUCTILITY
EMBRITTLEMENT
ENGINES
EXPERIMENTAL DATA
GAS TURBINE ENGINES
HEAT ENGINES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
INTERNAL COMBUSTION ENGINES
MATERIALS
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
NUMERICAL DATA
QUATERNARY ALLOY SYSTEMS
TENSILE PROPERTIES
TITANIUM ALLOYS