DFT data for giant hardening response in AlMgZn(Cu) alloys
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- 1. LAMMM Laboratory for Multiscale Mechanics Modeling, École Polytechnique Fédérale de Lausanne, CH-1015, Vaud, Switzerland
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Description
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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References
Journal reference (Paper with the published data) Stemper, L., Tunes, M. A., Dumitraschkewitz, P., Mendez-Martin, F., Tosone, R., Marchand, D., Curtin, W. A., Uggowitzer, P. J., & Pogatscher, S. (2020). Giant hardening response in AlMgZn(Cu) alloys. Acta Materialia, 206, 116617., doi: 10.1016/j.actamat.2020.116617
Journal reference (Paper with the published data) Stemper, L., Tunes, M. A., Dumitraschkewitz, P., Mendez-Martin, F., Tosone, R., Marchand, D., Curtin, W. A., Uggowitzer, P. J., & Pogatscher, S. (2020). Giant hardening response in AlMgZn(Cu) alloys. Acta Materialia, 206, 116617.