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Journal of Materials Science

, Volume 43, Issue 23–24, pp 7432–7437 | Cite as

Flow properties of an aluminum alloy processed by equal channel angular pressing

  • A. SivaramanEmail author
  • Uday Chakkingal
Ultrafine-Grained Materials

Abstract

Equal Channel Angular Pressing (ECAP) process is an important process for producing ultrafine-grained microstructures in bulk metals and alloys. In the present work, aluminum alloy AA 6063 samples were subjected to ECAP for up to three passes using an ECAP die with a die angle of 105°. The strain imparted to the specimen after three passes was approximately 2.64. Compression testing of the ECAP specimens was carried out to determine the subsequent flow behavior. Two types of compression test specimen orientations, one parallel to the axis of pressed sample and the other at 45° to the axis of the pressed sample, were used for the study. The strain path change (SPC) parameter was used to quantify the strain path change involved in straining by ECAP followed by straining by uniaxial compression. Higher flow strength values were observed in compression in specimens machined at 45º to the axis of the ECAP specimens. Flow softening and anisotropic behavior have been studied with respect to the number of passes and processing routes.

Keywords

Slip System Equal Channel Angular Pressing Strain Path Strain Rate Tensor Flow Softening 

Notes

Acknowledgement

This work was supported through a project sponsored by the Naval Research Board, Government of India, New Delhi. This support is gratefully acknowledged.

References

  1. 1.
    Segal VM (1995) Mater Sci Eng A 197:157–164. doi: https://doi.org/10.1016/0921-5093(95)09705-8 CrossRefGoogle Scholar
  2. 2.
    Valiev RZ, Mulyukov RR, Ovchinnikov VV, Shabashov VA (1991) Scr Metall Mater 25:2717. doi: https://doi.org/10.1016/0956-716X(91)90145-Q CrossRefGoogle Scholar
  3. 3.
    Segal VM (1999) Mater Sci Eng A 271:322–333. doi: https://doi.org/10.1016/S0921-5093(99)00248-8 CrossRefGoogle Scholar
  4. 4.
    Valiev RZ, Langdon TG (2006) Prog Mater Sci 51:881–981. doi: https://doi.org/10.1016/j.pmatsci.2006.02.003 CrossRefGoogle Scholar
  5. 5.
    Schmitt JH, Fernandes JV, Gracio JJ, Vieira MF (1991) Mater Sci Eng A . doi: https://doi.org/10.1016/0921-5093(91)90840-J CrossRefGoogle Scholar
  6. 6.
    Sakharova NA, Fernandes JV (2006) Mater Chem Phys 98:44–50. doi: https://doi.org/10.1016/j.matchemphys.2006.01.038 CrossRefGoogle Scholar
  7. 7.
  8. 8.
    Sivaraman A, Chakkingal U (2008) Mater Sci Eng A 487:264CrossRefGoogle Scholar
  9. 9.
    Dupuy L, Rauch EF (2002) Mater Sci Eng A 337:241CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Materials Forming Laboratory, Department of Metallurgical and Materials EngineeringIndian Institute of Technology MadrasChennaiIndia

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