Elevated temperature tensile behavior of Ti-25Al-10Nb-3V-1Mo
- Wright Lab., Wright-Patterson AFB, OH (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
- 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, Vol. 26, Issue 3; Other Information: PBD: Mar 1995
- Country of Publication:
- United States
- Language:
- English
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