Analysis of strengthening mechanisms in a severely-plastically-deformed Al-Mg-Si alloy with submicron grain size

Authors: Morris, D.; Gutierrez-Urrutia, I.; Muñoz-Morris, M.

Source: Journal of Materials Science, Volume 42, Number 5, March 2007 , pp. 1439-1443(5)

Publisher: Springer

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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.

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10853-006-0564-z

Affiliations: 1: Email: david.morris@cenim.csic.es

Publication date: 2007-03-01