The influence of alloy composition on precipitates of the Al−Mg−Si system

Marioara, Calin Daniel; Andersen, Sigmund Jarle; Zandbergen, H.W.; Holmestad, Randi

doi:10.1007/s11661-005-1001-7

Cited by 83 publications

(94 citation statements)

References 15 publications

(27 reference statements)

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“…However, a similar double peak has previously been reported [5,39,40], although it was in a denser alloying element, a Si-rich alloy in a quenched condition, which was related to the formation of an earlier phase, called pre-β". Namely, the double peak corresponds to a transition of pre-β" to β" precipitates.…”

Section: Discussionsupporting

confidence: 78%

“…A combination of the bright-field TEM images with corresponding thicknesses enabled average precipitate needlelengths, cross-sections, number densities and volume fractions to be quantified. A full description of the methodology has been given elsewhere [5,38]. The total number of precipitate lengths and cross-sections measured were roughly 2000 and 700 respectively, for the statistical analysis in each thermo-mechanical condition.…”

Section: Methodsmentioning

confidence: 99%

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The effects of quench rate and pre-deformation on precipitation hardening in Al–Mg–Si alloys with different Cu amounts

Saito

Marioara

Røyset

et al. 2014

Materials Science and Engineering: A

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The effects of quench rate after solution heat treatment in combination with 1% pre-deformation on precipitation hardening in three Al-Mg-Si alloys have been investigated by transmission electron microscopy and hardness measurements during an isothermal heat treatment. The alloys contain different Cu amounts (up to 0.1 wt%) and the same amounts of other solute elements. While a Cu amount below 0.01wt% does not affect precipitation hardening, an addition of 0.1wt% Cu increases hardness due to formation of a fine microstructure having a high number density of short precipitates. A double peak hardness evolution was observed during isothermal heat treatment. This effect was most pronounced for alloys with low quench rate, and less pronounced for alloys with 1% pre-deformation and 0.1wt% Cu addition. The low quench rate also led to wider precipitation free zones. This effect was also less pronounced by 1% predeformation and addition of 0.1wt% Cu.

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Section: Discussionsupporting

confidence: 78%

Section: Methodsmentioning

confidence: 99%

The effects of quench rate and pre-deformation on precipitation hardening in Al–Mg–Si alloys with different Cu amounts

Saito

Marioara

Røyset

et al. 2014

Materials Science and Engineering: A

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“…The precipitate volume fraction was calculated by multiplying the number density with the average needle length and the average cross section. Full description of the methodology has been given elsewhere [4,21]. The total number of precipitate lengths and cross-sections measured were roughly 2000 and 700 respectively, for the statistical analysis in each thermo-mechanical condition.…”

Section: Methodsmentioning

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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“…7a are practically negligible. By contrast, at typical experimental [28] β'' cross section sizes, the (weakly extrapolated)…”

Section: Analysis Of the Resultsmentioning

confidence: 87%

“…Experiment [28] reports typical β'' cross section dimensions of ≈ 4 × 4 nm -corresponding to a cross section size in terms of unit cells Na × Nc ≈ 5 × 6. As this range is almost fully covered by Fig.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

Ab initio based interface modeling for fully coherent precipitates of arbitrary size in Al alloys

Ehlers

Holmestad

2013

Computational Materials Science

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An ab initio based atomistic model scheme for an approximate determination of the interfacial and strain energies for the entire interface of a fully coherent precipitate in a host lattice is presented. For each given presumed compositionally abrupt interface, the model incorporates the effect of the strain evolution along the interface by use of a sequence of supercells. Each cell in this sequence has been distorted to describe the local interface region in question with the optimal accuracy allowed by periodic boundary conditions. Together, the cells comprise a shell of nm thickness, enclosing the full interface and its strongly affected near vicinity. The computational demands for the scheme are connected with the number of atoms in a given interface region cell, i.e., no scaling with precipitate size occurs -other than the number of cells required. In practice, this allows performing calculations for essentially all precipitate sizes. The scheme has been tested for the case of the main hardening precipitate β'' in the Al-Mg-Si alloy system and compared quantitatively with presently available alternatives. Implementation in an atomic hybrid model scheme for a full description of the precipitate interface energy should be realistic.

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The influence of alloy composition on precipitates of the Al−Mg−Si system

Cited by 83 publications

References 15 publications

The effects of quench rate and pre-deformation on precipitation hardening in Al–Mg–Si alloys with different Cu amounts

The effects of quench rate and pre-deformation on precipitation hardening in Al–Mg–Si alloys with different Cu amounts

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

Ab initio based interface modeling for fully coherent precipitates of arbitrary size in Al alloys

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