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Dislocation dynamics study of precipitate hardening in Al–Mg–Si alloys with input from experimental characterization

Published online by Cambridge University Press:  04 September 2017

Inga Ringdalen ,
Sigurd Wenner ,
Jesper Friis  and
Jaime Marian
Inga Ringdalen*
Affiliation:
SINTEF Materials and Chemistry, NO-7491 Trondheim, Norway
Sigurd Wenner
Affiliation:
SINTEF Materials and Chemistry, NO-7491 Trondheim, Norway Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
Jesper Friis
Affiliation:
SINTEF Materials and Chemistry, NO-7491 Trondheim, Norway
Jaime Marian
Affiliation:
Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, CA 90095, USA Department of Mechanical and Aerospace Engineering, University of California Los Angeles, Los Angeles, CA 90095, USA
*
Address all correspondence to Inga Ringdalen inga.g.ringdalen@sintef.no
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Abstract

Partial aging of AA6060 aluminum alloys is known to result in a microstructure characterized by needle-shaped Si/Mg-rich precipitates. These precipitates belong to the non-equilibrium β″ phase and are coherent with the face-centered cubic Al lattice, despite of which they can cause considerable hardening. We have investigated the interaction between these β″ precipitates and dislocations using a unique combination of modeling and experimental observations. Dislocation-precipitate interactions are simulated using dislocation dynamics (DD) parameterized with atomistic simulations. The elastic fields due to the precipitates are described by a decay law fitted to high-resolution transmission electron microscopy measurements. These fields are subsequently used in DD to study the strength of individual precipitates as a function of size and dislocation character. Our results can be used to parameterize crystal plasticity models to calculate the strength of AA6060 at the macroscopic level.

Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 3 , September 2017 , pp. 626 - 633
Copyright
Copyright © Materials Research Society 2017 

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