Abstract
Methods of severe plastic deformation of ductile metals and alloys offer the possibility of processing engineering materials to very high strength with good ductility. After typical amounts of processing strain, a submicrocrystalline material is obtained, with boundaries of rather low misorientation angles and grains containing a high density of dislocations. In the present study, an Al–Mg–Si alloy was severely plastically deformed by equal channel angular pressing (ECAP) to produce such a material. The material was subsequently annealed for dislocation recovery and grain growth. The strength of materials in various deformed and annealed states is examined and the respective contributions of loosely-arranged dislocations, many grain boundaries, as well as dispersed particles are deduced. It is shown that dislocation strengthening is significant in as-deformed, as well as lightly annealed materials, with grain boundary strengthening providing the major contribution thereafter.
Similar content being viewed by others
References
Furukawa M, Horita Z, Nemoto M, Valiev RZ, Langdon TG (1998) Phil Mag 78A:203
Hayes JS, Keyte R, Prangnell PB (2000) Mater Sci Technol 16:1259
Valiev RZ, Alexandrov IV, Zhu YT, Lowe TC (2002) J Mater Res 17:5
Gutierrez-Urrutia I, Muñoz-Morris MA, Morris DG (2005) Mater Sci Eng 394A:399
Gutierrez-Urrutia I, Muñoz-Morris MA, Morris DG (2006) J Mater Res (in press)
Brown LM, Ham RK (1971) In: Kelly A, Nicholson RD (eds) Strengthening methods in crystals, Elsevier, Amsterdam, The Netherlands
Armstrong RW, Douthwaite RM (1995) In: Otooni MA, Armstrong RW, Grant NJ, Ishizaki K (eds) Grain size and mechanical properties—Fundamentals and applications, Mater. Res. Soc. Symp. Proc. 362, Pittsburgh, PA, p 41
Hansen N (2005) Adv Eng Mater 7:815
Acknowledgements
We would like to thank the Comunidad de Madrid for financial support for part of this work under contract no. 07N/0087/2002.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Morris, D.G., Gutierrez-Urrutia, I. & Muñoz-Morris, M.A. Analysis of strengthening mechanisms in a severely-plastically-deformed Al–Mg–Si alloy with submicron grain size. J Mater Sci 42, 1439–1443 (2007). https://doi.org/10.1007/s10853-006-0564-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-006-0564-z