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

Ringdalen, Inga Gudem; Wenner, Sigurd; Friis, Jesper; Marian, Jaime
Journal article, Peer reviewed
Accepted version
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MRC1700078_PRF_igr.pdf (2.293Mb)
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http://hdl.handle.net/11250/2468833
Utgivelsesdato
2017
Metadata
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Originalversjon
MRS Communications. 2017, 7 (3), 626-633.   10.1557/mrc.2017.78
Sammendrag
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.
Utgiver
Cambridge University Press (CUP)
Tidsskrift
MRS Communications

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