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Research Papers

Mesoscopic Investigation of the Heterogeneities Induced by Channel-Die Compression

[+] Author and Article Information
Michel G. Darrieulat

Ecole Nationale Supérieure des Mines de Saint-Etienne, Centre “Sciences des Matériaux et des Structures,” UMR CNRS No. 5146, 158 cours Fauriel, 42023 Saint-Etienne, Cedex 2, Francedarrieulat@emse.fr

Khalid Zhani

Faculté des Sciences et Techniques de Tanger, Université Abdelmalek Essâadi, B.P. 416, Tanger, Moroccok_zhani@hotmail.com

René-Yves Fillit

Ecole Nationale Supérieure des Mines de Saint-Etienne, Centre “Sciences des Matériaux et des Structures,” UMR CNRS No. 5146, 158 cours Fauriel, 42023 Saint-Etienne, Cedex 2, Francefillit@emse.fr

Ahmed Chenaoui

Faculté des Sciences et Techniques de Tanger, Université Abdelmalek Essâadi, B.P. 416, Tanger, Moroccoa_chenaoui@hotmail.com

J. Eng. Mater. Technol 131(3), 031005 (May 22, 2009) (9 pages) doi:10.1115/1.3120390 History: Received September 10, 2008; Revised January 21, 2009; Published May 22, 2009

Experimental techniques were applied to study the heterogeneities of deformation of metals at the mesoscopic scale (typically 100μm in the present case). The first are fiducial carbon grids that are transferred on to the surface of the test-pieces. Here, they were used on single and polycrystals deformed in channel-die compression. They prove efficient for strains above 1. They bring out the role of the corners of the samples, which trigger bands of deformation that grow in importance as the compression goes on. They put in evidence the mesoheterogeneities that appear in the mechanical behavior of a few highly symmetric orientations such as cube. The second technique is the use of microfocused X-rays, which give the crystallographic orientation at the same scale of 100μm and can work in the presence of the carbon grids even when there is considerable strain hardening. The gradients found in the lattice rotations are far less pronounced than the sharp localizations in the displacement field. This highlights the importance of the rotations due to the activity of the slip systems.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Principle of the channel-die compression test

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Figure 2

Deformation of the grids and typical defects

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Figure 3

Sequence of deformation of a polycrystalline sample

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Figure 4

Deformation of remarkable single crystals

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Figure 5

Microfocus X-rays on the brass orientation

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Figure 6

Microfocus X-rays on the U orientation

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Figure 7

Microfocus X-rays on the copper orientation

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