Preprint Review Version 1 This version is not peer-reviewed

Review: Modes and Processes of Severe Plastic Deformation

Version 1 : Received: 1 July 2018 / Approved: 3 July 2018 / Online: 3 July 2018 (13:10:23 CEST)

A peer-reviewed article of this Preprint also exists.

Segal, V. Review: Modes and Processes of Severe Plastic Deformation (SPD). Materials 2018, 11, 1175. Segal, V. Review: Modes and Processes of Severe Plastic Deformation (SPD). Materials 2018, 11, 1175.

Journal reference: Materials 2018, 11, 1175
DOI: 10.3390/ma11071175

Abstract

In this review, severe plastic deformation (SPD) is considered as a materials processing technology. The deformation mode is the principal characteristic differentiating SPD from common forming operations. For large plastic strains, deformation mode depends on the distribution of strain rates between continuum slip lines and can be varied from pure shear to simple shear. A scalar, invariant and dimensionless coefficient of deformation mode is introduced as a normalized speed of rigid rotation. On this basis, simple shear provides the optimum mode for structure modification and grain refinement whereas pure shear is "ideal" for forming operations. Special experiments and SPD practice confirm this conclusion. Various techniques of SPD are classified and described in accordance with simple shear realization or approximation. It is shown that correct analyses of the processing mechanics and technological parameters are essential for comparison of SPD techniques and the development of effective industrial technologies.

Subject Areas

severe plastic deformation (SPD); mode deformation; simple shear and pure shear; structure modification;SPD techniques

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