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Effects of Strain Rate and Prestraining on Tensile Behavior of Duplex Gamma Titanium Aluminides

  • D. S. Shih (a1), D. S. Schwartz (a1) and J. E. O'Neal (a1)

Abstract

The effects of strain rate and prestraining on tensile behavior of two-phase (γ+α2) titanium aluminides at 20 and 730°C have been investigated. At 20°C the elongation remains at about 1.4% as the strain rate increases from 5ȕ10−5 to 5ȕ10−2 s−1 and it drops to nearly zero at 5ȕ10−1s−1. At 730°C ( i.e.above DBTT) the plastic strain is about 13% when tested at 5ȕ10−5s−1, while it reduces significantly to less than 3% at 5ȕ10−4 and 5ȕ10−2 s−1. Again, the elongation is about zero at the highest strain rate tested, 5ȕ10−1 s−1. Regardless of the strain rate, fracture by an intergranular mode of the primary equiaxed γ appears to increasingly dominate as temperature changes from 20 to 730°C. Introduction of prior plastic deformation by prestraining beyond yielding at 945°C obviously increases the 20°C yield stress, however, with little influence on ductility. Transmission electron microscopy reveals that a number of dislocation loops are produced during prestraining. These loops are generally immobile resulting in the observed increase of flow stress and unchanged ductility.

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References

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1. Huang, S-C. and Shih, D.S., in Microstructure/Property Relationships in Titanium Aluminides and Alloys, edited by Kim, Y-W. and Boyer, R.R., TMS, p. 105 (1991).
2. Shih, D.S., Huang, S-C., Scarr, G.K., Jang, H. and Chesnutt, J.C., in Microstructure/Property Relationships in Titanium Aluminides and Alloys, edited by Kim, Y-W. and Boyer, R.R., TMS, p. 135.
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Effects of Strain Rate and Prestraining on Tensile Behavior of Duplex Gamma Titanium Aluminides

  • D. S. Shih (a1), D. S. Schwartz (a1) and J. E. O'Neal (a1)

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