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Strain-Rate Effects on the Room Temperature Tensile Properties of a TiAl Alloy

Published online by Cambridge University Press:  01 January 1992

Y-W. Kim
Affiliation:
UES, Materials Research Division, 4401 Dayton-Xenia Rd., Dayton, OH 45432
D.M. Dimiduk
Affiliation:
Wright-Laboratory, WL/MLLM, WPAFB, OH 45433
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Abstract

The room temperature tensile properties and fracture behavior of a Ti-47A1-1.5Cr-lV-2.3Nb gamma TiAl alloy, have been investigated for two duplex and a fully-lamellar microstructural conditions. These microstructures were controlled through forging and subsequent recrystallization/solution treatments followed by furnace cooling and aging treatment at 900°C. Tensile testing was conducted on either as-machined or electropolished round-bar specimens over a range of strain rates from 10−5 to 10−1 sec−1 in laboratory air. Experiments showed that both tensile ductility and strength levels vary not only with microstructure and surface condition, but also with applied strain rate in an unexpected way. The complex relationships between these variables are under continuing investigation. The results to date, which were analyzed using microstructural observations made on the deformed and fractured specimens, indicate that the deformation and fracture modes remain essentially the same within the strain rate range used. The possible involvement of environmental effects in the fracture process is suggested.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

1. Kim, Y-W. and Dimiduk, D.M., JOM, 43 (August, 1991), pp. 4047.CrossRefGoogle Scholar
2. Kim, Y-W., Acta Metall., 40(6) (1992), pp. 11211134.CrossRefGoogle Scholar
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5. Shih, D.S. and Huang, S.C., in “Microstructure/Property Relationships in Titanium Aluminides and Alloys'“ ed., Kim, Y-W. and Boyer, R.R., A TMS Publication, TMS, Warrendale, 1990, pp.135148.Google Scholar
6. Dowling, W.E., et al. , in Ref.5, pp. 123133.Google Scholar
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