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Recovery of deformation substructure and coarsening of particles on annealing severely plastically deformed Al–Mg–Si alloy and analysis of strengthening mechanisms

Published online by Cambridge University Press:  01 February 2006

I. Gutierrez-Urrutia ,
M.A. Muñoz-Morris  and
D.G. Morris
I. Gutierrez-Urrutia
Affiliation:
Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigacion Cientifica (CSIC), E-28040 Madrid, Spain
M.A. Muñoz-Morris
Affiliation:
Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigacion Cientifica (CSIC), E-28040 Madrid, Spain
D.G. Morris*
Affiliation:
Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigacion Cientifica (CSIC), E-28040 Madrid, Spain
*
a)Address all correspondence to this author. e-mail: david.morris@cenim.csic.es
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Abstract

An Al–Mg–Si alloy was annealed to various solutionized and aged states and was then severely plastically deformed by equal channel angular pressing (ECAP). These materials were subsequently annealed for a range of times and temperatures to induce precipitation, dislocation recovery, and grain growth, with changes of mechanical behavior followed by tensile testing. Precipitation of excess solute was seen to occur in all cases, independent of the initial heat treated state, but the particles present appear to play only a small role in stabilizing the deformation substructure, at least until significant particle and grain coarsening has occurred, when discontinuous grain coarsening can be provoked. The strength of materials is examined, and the respective contributions of loosely arranged dislocations, many grain boundaries, and 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.

Keywords

Cold workingDislocationsMechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 2 , February 2006 , pp. 329 - 342
Copyright
Copyright © Materials Research Society 2006

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