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Phase Transformation in Orthorhombic Ti2AlNb Alloys Under Severe Deformation

  • B. A. Greenberg (a1), N. V. Kazantseva (a1) and V. P. Pilugin (a1)

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.

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1. Valiev, R.Z. in Nanostructured Materials Produced by Severe Plastic Deformation (Moscow, Logos, 2000).
2. Gusev, A.I. in Nanocristalline Materials: Preparation and Properties (Ekaterinburg, Ural Division of RAS, 1998)
3. Kazantseva, N. V., Greenberg, B. A., Popov, A. A. and Shorokhov, E. V., J. Phys. IV France, 2003, v 110, pp.923928

Phase Transformation in Orthorhombic Ti2AlNb Alloys Under Severe Deformation

  • B. A. Greenberg (a1), N. V. Kazantseva (a1) and V. P. Pilugin (a1)

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