The Crystal Structure of Al(x)Cu2Mg(12-x)Si7, (h-AlCuMgSi).

Arnberg, L.; Aurivillius, Bengt; Wahlström, Ebba; Malmros, Gunnar; Sjöblom, Johan; Strand, T. G.; Sukhoverkhov, V. F.

doi:10.3891/acta.chem.scand.34a-0001

Cited by 113 publications

(66 citation statements)

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“…The Q' phase, which is isostructural to the equilibrium Q phase, seems from our symmetry-averaged images to have a composition Al 6 Mg 6 Si 7 Cu 2 . This fits with the compositional framework found for the Q phase by X-ray diffraction, Al x Mg 12−x Si 7 Cu 2 (Arnberg and Aurivillius, 1980), with = 6. Density functional theory calculations have given a different composition of minimized enthalpy for both Q and Q', Al 3 Mg 9 Si 7 Cu 2 ( = 3) (Wolverton, 2001;Ravi and Wolverton, 2004).…”

Section: Chemistry In the Mapped Precipitatessupporting

confidence: 87%

“…The scanned areas are estimated to be about 30-40 nm thick based on the EDS count rate, projected density of precipitates and ADF image quality. The precipitate phases were identified based on their crystal structures as reported in the literature (Perlitz and Westgren, 1943;Zandbergen et al, 1997;Arnberg and Aurivillius, 1980). The phases are metastable, i.e.…”

Section: Methodsmentioning

confidence: 99%

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Atomic-resolution chemical mapping of ordered precipitates in Al alloys using energy-dispersive X-ray spectroscopy

Wenner

Jones

Marioara

et al. 2017

Micron

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Scanning transmission electron microscopy (STEM) coupled with energy-dispersive X-ray spectroscopy (EDS) is a common technique for chemical mapping in thin samples. Obtaining high-resolution elemental maps in the STEM is jointly dependent on stepping the sharply focused electron probe in a precise raster, on collecting a significant number of characteristic X-rays over time, and on avoiding damage to the sample. In this work, 80 kV aberration-corrected STEM-EDS mapping was performed on ordered precipitates in aluminium alloys. Probe and sample instability problems are handled by acquiring series of annular dark-field (ADF) images and simultaneous EDS volumes, which are aligned and non-rigidly registered after acquisition. The summed EDS volumes yield elemental maps of Al, Mg, Si, and Cu, with sufficient resolution and signal-to-noise ratio to determine the elemental species of each atomic column in a periodic structure, and in some cases the species of single atomic columns. Within the uncertainty of the technique, S and β'' phases were found to have pure elemental atomic columns with compositions Al 2 CuMg and Al 2 Mg 5 Si 4 , respectively. The Q' phase showed some variation in chemistry across a single precipitate, although the majority of unit cells had a composition Al 6 Mg 6 Si 7.2 Cu 2 .

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Section: Chemistry In the Mapped Precipitatessupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Atomic-resolution chemical mapping of ordered precipitates in Al alloys using energy-dispersive X-ray spectroscopy

Wenner

Jones

Marioara

et al. 2017

Micron

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“…As mentioned earlier, an addition of ~0.4wt% Cu alters the precipitation sequence in undeformed conditions of Al-Mg-Si alloys [9][10][11][12][13]. However, no precipitate types other than β'' and β''/disordered were observed in the un-deformed condition of the alloy containing 0.10 wt% Cu.…”

Section: Precipitate Typesmentioning

confidence: 88%

“…However, the periodicity associated with the hexagonal Si-network can be identified, see the grid overlay in (iv). [2,3], (ii) C phase [27] and (iii) Q phase precipitates [13], drawn in the same scale. The common local arrangement around Cu atomic columns is indicated by dotted triangles on (ii) and (iii), which is identified for C, Q, Q' and L phases [14,27].…”

Section: Discussionmentioning

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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“…For instance, Cu (~0.4 wt%) drastically alters the precipitation sequence as follows [10][11][12][13][14]:…”

Section: Effects Of Additional Alloying Elementsmentioning

confidence: 99%

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

Saito

Wenner

Osmundsen

et al. 2014

Philosophical Magazine

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The Crystal Structure of Al(x)Cu2Mg(12-x)Si7, (h-AlCuMgSi).

Cited by 113 publications

References 0 publications

Atomic-resolution chemical mapping of ordered precipitates in Al alloys using energy-dispersive X-ray spectroscopy

Atomic-resolution chemical mapping of ordered precipitates in Al alloys using energy-dispersive X-ray spectroscopy

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

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

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