2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 1: Aifantis Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Bordas S, Estrin Y |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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The Nature of Structure Evolution upon Severe Plastic Deformation
Alexander Glezer1;1NATIONAL UNIVERSITY OF SCINCE AND TECHNOLOGY, Moscow, Russian Federation;
Type of Paper: Regular
Id Paper: 165
Topic: 1
Abstract:
The structure transformations occurring upon severe plastic deformation (SPD) of materials attract a great interest since, in many respects, they do not follow the regularities typical of conventional macroscopic deformation. First of all, the following phenomenon must be stand out at the SPD: fragmentation, the absence of work hardening, abnormally high atomic diffusibility, dynamical recrystallization, precipitation or solution of unstable phases, amorphization. Unfortunately, most people studying SPD are limited to the study of finite structures and properties of materials and do not analyze the physical processes occurring directly at huge degrees of plastic flow. There is still no clear physical criterion of the transition from conventional deformation to the SPD stage.
The purpose of this presentation is to bring the structure formation processes occurring upon SPD into a single physical picture which should be capable to consistently explain all the experimental data accumulated to date. A general approach to the description of the basic law of structural and phase transformations is proposed within the concept of the appearance of additional channels for the dissipation of mechanical energy supplied to the solid state. It is shown that the active involvement of cyclic processes of low-temperature dynamic recrystallization and of the crystal-amorphous state phase transformations in combination with additional thermal effects under the conditions of insufficient efficiency of dislocation and disclination accommodation processes can consistently explain almost all the main experimental results obtained to date for SPD.
The authors are grateful to the Russian Scientific Foundation for financial support (grant 14-12-00170).