A hybrid aluminium alloy and its zoo of interacting nano-precipitates

Wenner, Sigurd; Marioara, Calin Daniel; Andersen, Sigmund Jarle; Ervik, Martin; Holmestad, Randi

doi:10.1016/j.matchar.2015.06.002

Cited by 20 publications

(13 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The heterogeneous nucleation of '-Al 2 Cu phase and the Q'(Q)-AlCuMgSi phase, observed in Fig. 9 (b), was also reported by other authors [21,34] . It could be caused by the strain field of Q-phase precipitates on which the '-Al 2 Cu nucleate.…”

Section: Upon Artificial Aging -Identification Of Precipitationsupporting

confidence: 84%

Precipitation in original Duralumin A-U4G versus modern 2017A alloy

et al. 2019

View full text Add to dashboard Cite

Precipitation in Duralumin, a historic quaternary alloy of the type: Al-Cu-Mg-Si, was never fully studied nor observed by current electron microscopy techniques. This article presents the full characterization and comparison of two alloys: a Duralumin (A-U4G) from the 1950s collected on a vintage aircraft and its modern equivalent: a 2017A alloy. The as-received and peak-aging states were analysed with DSC, SAXS and TEM advanced techniques. It is shown that old Duralumin and modern 2017A present a similar nanoprecipitation in the as-received state and behave similarly upon artificial aging. As opposed to what has been reported in the past, three types of precipitates participating in hardening were found upon aging: '-Al 2 Cu, Q'(Q)-AlCuMgSi and Ω-Al 2 Cu.

show abstract

Section: Upon Artificial Aging -Identification Of Precipitationsupporting

confidence: 84%

Precipitation in original Duralumin A-U4G versus modern 2017A alloy

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The view of this phase in the [001] direction and fitting to the HAADF image is shown in Figure 9. Similar HAADF-STEM image of that precipitate acquired along [001] direction can be found in [18]. Coprecipitation of θ′-and Q-phase precipitates was described in [19].…”

Section: Resultssupporting

confidence: 61%

Phase Identification of Nanometric Precipitates in Al-Si-Cu Aluminum Alloy by Hr-Stem Investigations

Pawlyta¹,

Labisz²,

Matus³

2016

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

Aluminium recycling is cost-effective and beneficial for the environment. It is expected that this trend will continue in the future, and even will steadily increase. The consequence of the use of recycled materials is variable and difficult to predict chemical composition. This causes a significant reduction in the production process, since the properties of produced alloy are determined by the microstructure and the presence of precipitates of other phases. For this reason, the type and order of formation of precipitates were systematically investigated in recent decades. These studies involved, however, only the main systems (Al-Cu, Al-Mg-Si, Al-Cu-Mg, Al-Mg-Si-Cu), while more complex systems were not analysed. Even trace amounts of additional elements can significantly affect the alloy microstructure and composition of precipitates formed. This fact is particularly important in the case of new technologies such as laser surface treatment. As a result of extremely high temperature and temperature changes after the laser remelting large amount of precipitates are observed. Precipitates are nanometric in size and have different morphology and chemical composition. A full understanding of the processes that occur during the laser remelting requires their precise but also time effectively phase identification, which due to the diversity and nanometric size, is a major research challenge. This work presents the methodology of identification of nanometer phase precipitates in the alloy AlSi9Cu, based on the simultaneous TEM imaging and chemical composition analysis using the dispersion spectroscopy using the characteristic X-ray. Verification is performed by comparing the simulation unit cell of the identified phase with the experimental high-resolution image.

show abstract

“…After extrusion into cylindrical rods of 20 mm diameter, samples were heated at 400 • C for 1 hour, quenched in water and directly aged at 150 • C for 32 days. In addition to θ ′ , several other phases were present: see [10] for details on the microstructure evolution. TEM specimens were thinned by electrolyte polishing at 20 V, using a mixture of 1/3 HNO 3 and 2/3 CH 3 OH cooled to −25 • C.…”

Section: Experimental Methodologymentioning

confidence: 99%

Structural modifications and electron beam damage in aluminium alloy precipitate θ'–AL₂

Wenner

Friis

Marioara

et al. 2015

Philosophical Magazine

Self Cite

View full text Add to dashboard Cite

The θ ′ -Al2Cu phase in an Al-4Zn-2Cu-1Mg-0.7Si (wt.%) alloy was investigated by means of scanning transmission electron microscopy. With our specific alloy composition, the phase is often formed with stacking faults on {101} θ ′ and {001} θ ′ planes. The stacking faults on {101} θ ′ planes are often regularly spaced and create a previously unreported superstructure. Structural damage by electron irradiation is observed, even at a low acceleration voltage of 80 kV. The damage is more pronounced in the θ ′ precipitates with stacking faults, which agrees with theoretical calculations of knock-on scattering cross-sections. These two very different forms of disruptions of the θ ′ structure are linked to its spacious interstitial sites and the ease at which Cu atoms diffuse into and between them.

show abstract

A hybrid aluminium alloy and its zoo of interacting nano-precipitates

Cited by 20 publications

References 47 publications

Precipitation in original Duralumin A-U4G versus modern 2017A alloy

Precipitation in original Duralumin A-U4G versus modern 2017A alloy

Phase Identification of Nanometric Precipitates in Al-Si-Cu Aluminum Alloy by Hr-Stem Investigations

Structural modifications and electron beam damage in aluminium alloy precipitate θ'–AL₂

Contact Info

Product

Resources

About

A hybrid aluminium alloy and its zoo of interacting nano-precipitates

Cited by 20 publications

References 47 publications

Precipitation in original Duralumin A-U4G versus modern 2017A alloy

Precipitation in original Duralumin A-U4G versus modern 2017A alloy

Phase Identification of Nanometric Precipitates in Al-Si-Cu Aluminum Alloy by Hr-Stem Investigations

Structural modifications and electron beam damage in aluminium alloy precipitate θ'–AL2

Contact Info

Product

Resources

About

Structural modifications and electron beam damage in aluminium alloy precipitate θ'–AL₂