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Phase Transformation in Orthorhombic Ti2AlNb Alloys Under Severe Deformation

Published online by Cambridge University Press:  26 February 2011

B. A. Greenberg ,
N. V. Kazantseva  and
V. P. Pilugin
B. A. Greenberg
Affiliation:
Institute of Metal Physics, Ural Division of Russian Academy of Sciences, Ekaterinburg, GSP-170, Russia
N. V. Kazantseva
Affiliation:
Institute of Metal Physics, Ural Division of Russian Academy of Sciences, Ekaterinburg, GSP-170, Russia
V. P. Pilugin
Affiliation:
Institute of Metal Physics, Ural Division of Russian Academy of Sciences, Ekaterinburg, GSP-170, Russia
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Abstract

It was found that severe plastic deformation of orthorhombic alloys caused phase transformations of the displacement type and those associated with a change in the degree of long-range order, namely B2→ω(B82 ), B2→B19 and B2→β (BCC) (in the case of alloy with initial B2-phase structure) and O→B19→A20 (initial O-phase structure, Ti2AlNb). Unlike to ordinary metals, severe plastic deformation of the titanium aluminum intermetallics leads to decreasing of the strength of the material. The B19 and A20 phases are metastable. They are absent in the equilibrium phase diagrams of the compounds under investigation. The formation of the disordered phase states with extensive sliding and having great plasticity under severe deformation makes possible to consider severe deformation as the way for increasing of plasticity of the titanium aluminides.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S5.51
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

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