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Hot-Workability of Gamma-Based TiAl Alloys during Severe Torsional Deformation

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Abstract

Wrought TiAl products manufactured by conventional hot-working procedures, such as forging and extrusion, suffer from structural and chemical inhomogeneities, which are major concerns for the reliability of components. In an attempt to overcome these problems, TiAl alloys were hot worked by torsional deformation. Using this method, a much higher strain and mechanical work can be imparted, which triggers dynamic recrystallization. The metallurgical potential of this technique will be assessed. Particular emphasis is placed on shear localization processes, which often lead to premature failure of the workpiece.

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  1. Philips (now FEI) Hillsboro, USA.

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Acknowledgments

The authors thank M. Oehring, J.D.H. Paul, S. Eggert, U. Lorenz, and J. Muellauer for helpful discussions and support. They also thank the referees for their comments, which were appreciated very much.

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  1. GKSS Research Centre, Institute for Materials Research, Max-Planck-Straße 1, D-21502, Geesthacht, Germany

    U. Fröbel (Scientist) & F. Appel (Scientist)

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  1. U. Fröbel
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  2. F. Appel
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Correspondence to U. Fröbel.

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Manuscript submitted August 10, 2006

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Fröbel, U., Appel, F. Hot-Workability of Gamma-Based TiAl Alloys during Severe Torsional Deformation. Metall Mater Trans A 38, 1817–1832 (2007). https://doi.org/10.1007/s11661-007-9203-9

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