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PLENARY LECTURES AND VIP GUESTS
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Laszlo Toth
Metz University
The Role Of Geometrically Necessary Dislocations In The Plastic Behavior Of Pure Copper At Extreme Large Strains
Aifantis International Symposium
(2nd Intl. symp. on Multiscale Material Mechanics in the 21st Century)[Dislocation Patterning]
Back to Plenary Lectures »
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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.
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