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 Role of Geometrically Necessary Dislocations in the Plastic Behavior of Pure Copper at Extreme Large Strains
Laszlo Toth1;1METZ UNIVERSITY, Metz, France;
Type of Paper: Keynote
Id Paper: 377
Topic: 1
Abstract:
The density of geometrically necessary dislocations (GNDs) obtained from the lattice curvature was studied in different strain paths up to extreme large strains in commercially pure copper. Its evolution shows a maximum at medium large strains followed by a constant decrease when the stationary limiting stage of grain refinement is reached. At the same time, the total dislocation density is also decreasing. It is suggested using polycrystal modeling of the evolution of the crystallographic texture that the low quantity of GNDs at extreme large strains leads to a near Taylor-type homogeneous behavior of the polycrystalline ultra-fine grained structure. A new analytic modeling scheme is also proposed which is able to reproduce the evolution of the GND density for all stages of the severe plastic deformation processes.