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Materials 2018, 11(7), 1175; https://doi.org/10.3390/ma11071175

Review: Modes and Processes of Severe Plastic Deformation (SPD)

Engineered Performance Materials, 2874 Laurel Ridge Ln, Howell, MI 48843, USA
Received: 21 May 2018 / Revised: 11 June 2018 / Accepted: 11 June 2018 / Published: 10 July 2018
(This article belongs to the Section Manufacturing Processes and Systems)
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Abstract

In this review, severe plastic deformation (SPD) is considered as a materials processing technology. The deformation mode is the principal characteristic differentiating SPD techniques 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 optimal 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 the comparison of SPD techniques and the development of effective industrial technologies. View Full-Text
Keywords: severe plastic deformation (SPD); mode deformation; simple shear and pure shear; structure modification; SPD techniques severe plastic deformation (SPD); mode deformation; simple shear and pure shear; structure modification; SPD techniques
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Segal, V. Review: Modes and Processes of Severe Plastic Deformation (SPD). Materials 2018, 11, 1175.

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