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DFT data for giant hardening response in AlMgZn(Cu) alloys

Daniel Marchand1*, Curtin William1*

1 LAMMM Laboratory for Multiscale Mechanics Modeling, École Polytechnique Fédérale de Lausanne, CH-1015, Vaud, Switzerland

* Corresponding authors emails: daniel.marchand@epfl.ch, william.curtin@epfl.ch
DOI10.24435/materialscloud:2k-cy [version v1]

Publication date: Dec 21, 2021

How to cite this record

Daniel Marchand, Curtin William, DFT data for giant hardening response in AlMgZn(Cu) alloys, Materials Cloud Archive 2021.227 (2021), doi: 10.24435/materialscloud:2k-cy.


AiiDA calculations for the publication Giant hardening response in AlMgZn(Cu) alloys. This study presents a thermomechanical processing concept which is capable of exploiting the full indus- trial application potential of recently introduced AlMgZn(Cu) alloys. The beneficial linkage of alloy design and processing allows not only to satisfy the long-standing trade-off between high mechanical strength in use and good formability during processing but also addresses the need for economically feasible processing times. After an only 3-hour short pre-aging treatment at 100 °C, the two investigated alloys, based on commercial EN AW-5182 and modified with additions of Zn and Zn + Cu respectively, show high formability due to increased work-hardening. Then, these alloys exhibit a giant hardening response of up to 184 MPa to reach a yield strength of 410 MPa after a 20-minute short final heat treatment at 185 °C, i.e. paint-baking. This rapid hardening response strongly depends on the number density, size distribution and constitution of precursors acting as preferential nucleation sites for T-phase precursor precipitation during the final high-temperature aging treatment and is significantly increased by the addition of Cu. Minor deformation (2%) after pre-aging and before final heat treatment further enhances the development of hardening precipitates additionally by activating dislocation-supported nucleation and growth. Tensile testing, quantitative and analytical electron-microscopy methods, atom probe analysis and DFT calculations were used to characterize the alloys investigated in this work over the thermomechanical processing route. The influence of pre-strain on the hardening response and the role of Cu additions in early-stage cluster nucleation are discussed in detail and supported by in-situ STEM experiments and first-principles calculations.

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135.1 MiB AiiDA Group Dump Tphase antisite calculations
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130.2 MiB AiiDA Group Dumps for Tphase calculations
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Aluminum Metallurgy MARVEL/DD2

Version history:

2021.227 (version v1) [This version] Dec 21, 2021 DOI10.24435/materialscloud:2k-cy