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Plastic anisotropy in aluminum and copper pre-strained by equal channel angular extrusion

  • Nano May 2006
  • Published:
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Abstract

The mechanical response of as-processed equal channel angular extrusion materials is anisotropic, depending on both direction and sense of straining. The stress–strain curves exhibit hardening characteristics different from the usual work hardening responses, e.g., Stages I–IV, expected in annealed fcc metals under monotonic loading. In this work, the anisotropic flow responses of two pure fcc metals, Al and Cu, processed by route Bc are evaluated and compared based on pre-strain level (number of passes), direction of reloading, sense of straining (i.e., compression versus tension), and their propensity to generate subgrain microstructures and to rearrange, should the slip activity change. In most cases, either macroscopic work softening or strain intervals with little to no work hardening are observed. Application of a crystallographically based single-crystal hardening law for strain-path changes [Beyerlein and Tomé, Int. J. Plasticity (2007)] incorporated into a visco-plastic self-consistent (VPSC) model supports the hypothesis that suppression of work hardening is due to reversal or cross effects operating at the grain level.

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Notes

  1. The exponent n is set equal to 20 and \({\dot{\gamma}_0}\) is set equal to the macroscopic strain rate. As a consequence strain rate effects induced by n are removed. They can be introduced into the slip resistance, τ s c , if desired.

  2. The lower part in Fig. 9 consists of localized plastic deformation bounding a region of rigidly rotating material.

  3. For the die geometry (Fig. 1), processing conditions, and copper used in [8], the lower part applies to the bottom 10%–20% of the billet.

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Acknowledgements

Support by a Los Alamos Laboratory-Directed Research and Development project (No. 20030216) and Office of Basic Energy Sciences Project FWP 06SCPE401 are gratefully acknowledged.

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Authors and Affiliations

  1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Irene J. Beyerlein

  2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    David J. Alexander & Carlos N. Tomé

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  1. Irene J. Beyerlein
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  2. David J. Alexander
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  3. Carlos N. Tomé
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Correspondence to Irene J. Beyerlein.

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Beyerlein, I.J., Alexander, D.J. & Tomé, C.N. Plastic anisotropy in aluminum and copper pre-strained by equal channel angular extrusion. J Mater Sci 42, 1733–1750 (2007). https://doi.org/10.1007/s10853-006-0906-x

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