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Tensile Fracture Behavior of a Cast Gamma-Titanium Aluminide

Published online by Cambridge University Press:  26 February 2011

V. Seetharaman ,
R. L. Goetz  and
S. L. Semiatin
V. Seetharaman
Affiliation:
UES, Inc., Dayton, OH 45432
R. L. Goetz
Affiliation:
UES, Inc., Dayton, OH 45432
S. L. Semiatin
Affiliation:
Battelle Memorial Institute, Columbus, OH 43201
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Abstract

The fracture behavior of a cast gamma-titanium-aluminide alloy (Ti-49.5A1–2.5Nb-l. 1Mn) during deformation processing was investigated using hot-tension testing and isothermal-forging experiments. In uniaxial tension, fracture ductility increased with an increase in the test temperature and a decrease in the imposed strain rate. During open-die forging of this alloy under isothermal conditions, tensile stresses generated due to frictional effects and the associated inhomogeneous plastic deformation led to free-surface fracture via intergranular cracking. The failure observations under these two deformation modes were correlated successfully using a tensile-damage criterion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 895
Copyright
Copyright © Materials Research Society 1991

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References

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