The effect of Cu on precipitation in Al–Mg–Si alloys

Marioara, Calin Daniel; Andersen, Sigmund Jarle; Stene, Tore; Hasting, H. K.; Walmsley, John C.; Helvoort, Antonius T. J. van; Holmestad, Randi

doi:10.1080/14786430701287377

Cited by 246 publications

(160 citation statements)

References 27 publications

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“…Interestingly, a new precipitate configuration containing Ag was observed. Similar configurations are normally reported to exist in Cu containing 6xxx alloys and are referred to as Q' or C-plate [6] [25]. In the present study, the "Cu-sites" in the Q'/C -like phase were occupied by Ag.…”

Section: Ag Added Alloysupporting

confidence: 49%

Atomistic details of precipitates in lean Al–Mg–Si alloys with trace additions of Ag and Ge studied by HAADF-STEM and DFT

Mørtsell

Andersen

Friis

et al. 2017

Philosophical Magazine

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Bonding energies and volume misfits for alloying elements and vacancies in multicomponent Al-Mg-Si alloys have been calculated using density functional theory and the results have been compared with numbers obtained by atomic scale precipitate structure analysis, using high angle annular dark-field scanning transmission electron microscopy. The techniques in combination provide new insight into precipitation in these alloys. In the Ge containing alloy were found two new stacking configurations of the well-known strengthening phase β". In the alloy with Ag a new Q'/C -like local configuration containing Ag was discovered, and a model has been proposed. The experimental results are justified by simulations.

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Section: Ag Added Alloysupporting

confidence: 49%

Atomistic details of precipitates in lean Al–Mg–Si alloys with trace additions of Ag and Ge studied by HAADF-STEM and DFT

Mørtsell

Andersen

Friis

et al. 2017

Philosophical Magazine

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“…16 The processes of clustering and precipitation are very sensitive to parameters such as alloy composition, storage time, aging temperature, and heating/cooling rates.…”

Section: Introductionmentioning

confidence: 99%

Probing defects in Al-Mg-Si alloys using muon spin relaxation

et al. 2012

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Muon spin methods are very sensitive to nanoscale defects such as trace elements and vacancies in metals. This sensitivity is required when investigating Al-Mg-Si alloys, a complicated system in which diffusion-controlled phase transformations are responsible for the most important hardening mechanisms. We present muon spin relaxation experiments conducted on Al-Mg-Si alloys at measurement temperatures in the range 20-300 K. Varying the alloy composition and heat treatment, we find differences in muon depolarization in several temperature regimes. This reflects differences in concentration of several types of muon-trapping defects. We identify free solute atom and vacancy regimes, and confirm that the concentration of these defects decrease when an alloy is annealed at low temperature. We further attribute one regime to Mg-Si-vacancy clustering, a mechanism required for precipitation hardening during aging. After storage at room temperature, muon trapping in this regime is more pronounced for a Mg-rich alloy than a Mg-Si-balanced alloy.

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“…identified as Q' and/or C together with more disordered parts, but all parts are connected by the same Si-network [9,14]. An exception from the above is the β'' phase, which has a distorted Sinetwork.…”

mentioning

confidence: 99%

The Effects of Low Cu Additions and Predeformation on the Precipitation in a 6060 Al-Mg-Si Alloy

Saito

Muraishi

Marioara

et al. 2013

Metall Mater Trans A

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Effects of low Cu additions (≤0.10 wt%) and 10% pre-deformation before aging on precipitate microstructures and types in a 6060 Al-Mg-Si alloy have been investigated using transmission electron microscopy (TEM). It was found that pre-deformation enhances precipitation kinetics and leads to formation of heterogeneous precipitate distributions along dislocation lines. These precipitates were often disordered. Cu additions caused finer microstructures, which resulted in highest materials hardness, in both the un-deformed and the pre-deformed conditions. The introduced pre-deformation led to microstructure coarsening. This effect was less pronounced in the presence of Cu. The precipitate structure was studied in detail by high resolution TEM (HRTEM) and high angle annular dark field scanning TEM (HAADF-STEM). The Cu additions did not alter the respective precipitation sequence in either the un-deformed or the pre-deformed conditions, but caused a large fraction of β'' precipitates to be partially disordered in the undeformed conditions. Cu atomic columns were found in all the investigated precipitates, except for perfect β''. Although no unit cell was observed in the disordered precipitates, the presence of a periodicity having hexagonal symmetry along the precipitate length was inferred from the fast Fourier transforms (FFT) of HRTEM images, and sometimes directly observed in filtered HAADF-STEM images.

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The effect of Cu on precipitation in Al–Mg–Si alloys

Cited by 246 publications

References 27 publications

Atomistic details of precipitates in lean Al–Mg–Si alloys with trace additions of Ag and Ge studied by HAADF-STEM and DFT

Atomistic details of precipitates in lean Al–Mg–Si alloys with trace additions of Ag and Ge studied by HAADF-STEM and DFT

Probing defects in Al-Mg-Si alloys using muon spin relaxation

The Effects of Low Cu Additions and Predeformation on the Precipitation in a 6060 Al-Mg-Si Alloy

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