Mechanical Behaviour and Microstructure Evolution of Severely Deformed Two-Phase Titanium Alloys

Sergey V. Zherebtsov; Sergey Mironov; Maria A. Murzinova; S. Salishchev; S. Lee Semiatin

doi:10.4028/www.scientific.net/MSF.584-586.771

Paper Titles

Development of Extrusion and Rolling Textures during ECAP of Mg-Alloys
p.748

Study of a Fine-Grained AZ31 Magnesium Alloy Prepared by Equal Channel Angular Pressing
p.754

Production of Nanostructure in Titanium by Cold Rolling
p.759

Crystallographic Texture Development in CP Ti Subjected to ECAP
p.765

Mechanical Behaviour and Microstructure Evolution of Severely Deformed Two-Phase Titanium Alloys
p.771

Nanocrystalline Titanium Rods Processed by Hydrostatic Extrusion
p.777

Mechanical Properties of Ti–6Al–4V Titanium Alloy with Submicrocrystalline Structure Produced by Multiaxial Forging
p.783

Structure and Mechanical Properties of Severely Deformed Cu-Cr-Zr Alloys Produced by Accumulative Roll-Bonding Process
p.791

On the Effect of Deformation Mode on Fatigue: Simple Shear vs. Pure Shear
p.797

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Mechanical Behaviour and Microstructure Evolution of Severely Deformed Two-Phase Titanium Alloys

Abstract:

Microstructure evolution and mechanical behavior of alpha/beta Ti-6Al-4V (VT6) and near-beta Ti-5Al-5Mo-5V-1Cr-1Fe (VT22) titanium alloys during uniaxial compression at 600°C to a high strain of 70% was studied. The plastic-flow response for both alloys is characterized by successive stages of strain hardening, flow softening, and steady-state flow. During compression the lamellae spheroidized to produce a partially globular microstructure. Globularization in VT6 is associated with the loss of the initial Burgers-type coherency between the alpha and beta phases and the subsequent individual deformation of each phase. The misorientations of boundaries increase to the high-angle range by means of the accumulation of lattice dislocations. In VT22 alloy the alpha phase evolves similar to that in VT6 alloy, while in the beta phase mainly low-angle boundaries are observed even after 70 pct. reduction.