Elevated temperature tensile behavior of Ti-25Al-10Nb-3V-1Mo

Journal Article · Tue Feb 28 23:00:00 EST 1995 · Metallurgical Transactions, A

OSTI ID:31976

Ward, C H ^[1]; Thompson, A W ^[2]; Williams, J C ^[3]

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1. Wright Lab., Wright-Patterson AFB, OH (United States)
2. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
3. GE Aircraft Engines, Cincinnati, OH (United States). Engineering Materials Technology Labs.

The effects of microstructure and temperature on tensile and fracture behavior were explored for the titanium aluminide alloy Ti-25Al-10Nb-3V-1Mo. Three microstructures were selected for study in an attempt to determine the role of the individual microstructural constituents in this {alpha}{sub 2} + B2 alloy. Tensile testing of both round and flat specimens in vacuum indicated a change in deformation behavior from 25 C to 450 C. Observations suggested that this change in deformation behavior occurred within the {alpha}{sub 2} phase. Failure initiation at 450 C and above was by a ductile process and was associated with the B2 phase. Above 600 C and at high strains, plastic deformation occurred predominantly in the B2 phase. Strain localization was observed above 600 C and found to be due to the lower work-hardening rate of the B2 phase. Strain localization at slip band intersections with prior {beta} grain boundaries resulted in rapid strain accumulation in the B2 phase. Alignment of secondary {alpha}{sub 2} laths with the tensile axis at high deformation levels appeared to inhibit shear band localization between voids due to a lack of participation of the {alpha}{sub 2} phase in deformation.

• OSTI ID: 31976
• Journal Information: Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 3 Vol. 26; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOY SYSTEMS
ALUMINIUM ALLOYS
EXPERIMENTAL DATA
FRACTURE PROPERTIES
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TITANIUM BASE ALLOYS
VANADIUM ALLOYS