Structure, unelastic properties, and deformation behavior of ultrafine-grained titanium

Abstract

The results of investigations into the structure, unelastic properties, deformation behavior, strength, and plasticity of ultrafine-grained titanium produced by equichannel angular pressing are discussed. Particlular emphasis has been placed on the grain-boundary unelasticity and the effects of external thermal and thermal-force actions on the deformation behavior and plastic deformation localization at the meso-and macroscale levels. The influence of cold plastic deformation of ultrafine-grained titanium on the grain-boundary unelasticity and temperature dependence of the mechanical properties is considered.

Deformation Behavior and Plastic Strain Localization of Nanostructured Materials Produced by Severe Plastic Deformation

“…The plastic strain localization pattern in metals and alloys changes radically when a nanostructural state forms. Investigations on the deformation surface relief of tensile specimens at room temperature [7][8][9][10][11][12] have shown that plastic strain localization is evident in nanostructured metals and alloys as meso-and macrobands 1-10 and 300-500 µm in width, respectively (Fig. 1).…”

“…In [8,9], nanostructured titanium was used as an example to study the correlation between plastic strain localization and deformation stages in tensile stress-strain curves. The strain-hardening stage in the engineering stress-strain curve was found to correspond to the nucleation and development of mesoscopic localized plastic deformation bands.…”