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

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Abstract

The effects of microstructure and temperature on tensile and fracture behavior were explored for the titanium aluminide alloy Ti-25Al-10Nb-3V-lMo (atomic percent). Three microstructures were selected for study in an attempt to determine the role of the individual microstructural constituents in this α2 + 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 α2 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 β grain boundaries resulted in rapid strain accumulation in the B2 phase. Alignment of secondary α2 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 α2 phase in deformation.

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Authors and Affiliations

  1. Engineering Materials Technology Laboratories, GE Aircraft Engines, 45215, Cincinnati, OH

    C. H. Ward, A. W. Thompson & J. C. Williams (General Manager)

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  1. C. H. Ward
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  2. A. W. Thompson
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  3. J. C. Williams
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Formerly Materials Scientist, Materials Directorate, Wright Laboratory, Wright-Patterson AFB, Dayton, OH 45433, is Program Manager, Air Force Office of Scientific Research, Boiling AFB, Washington, DC 20332.

Formerly Professor, Carnegie Mellon University, Department of Materials Science and Engineering, Pittsburgh, PA 15213, is Scientist, Lawrence Berkeley Laboratory, Berkeley, CA 94720.

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Ward, C.H., Thompson, A.W. & Williams, J.C. Elevated temperature tensile behavior of Ti-25AI-10Nb-3V-1Mo. Metall Mater Trans A 26, 703–720 (1995). https://doi.org/10.1007/BF02663919

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