Towards electroformed nanostructured aluminum alloys with high strength and ductility

Ruan, Shiyun; Schuh, Christopher A.

doi:10.1557/jmr.2012.105

Cited by 17 publications

(13 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pulse plating was conducted with a current waveform composed of 6 mA/cm 2 of cathodic pulse and 3 mA/cm 2 of anodic pulse, each of 20 ms duration, following the procedure in Ref. [40]. The total deposition time was 8 hours, leading to a deposit with a thickness around 10 μm.…”

Section: Methodsmentioning

confidence: 99%

“…These unique properties enable the deposition of low reduction potential metals such as aluminum, magnesium and titanium at moderate temperatures, or even semiconductors and compounds, [36,37] without concern for hydrogen evolution. The technique can produce fully dense and deployable materials in the as-deposited condition if properly controlled [38,39], and the internal structure can be finely tuned , by, e.g., controlling the applied current waveform [4,40]. Meanwhile, challenges such as a multiplicity of redox states [37] as well as insufficient adhesion at some substrate sites [41], and solution sensitivity to water [36] all need more attention.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Grain boundary segregation in Al–Mn electrodeposits prepared from ionic liquid

et al. 2015

Self Cite

View full text Add to dashboard Cite

Among the various preparation methods for nanocrystalline alloys, ionic liquid electrodeposition at low temperature is of interest for its scalability and efficiency. To achieve nanostructures with stabilized structures, it is desirable to directly deposit alloys in which the grain boundaries are decorated with a segregated alloying element. Here a combination of atom probe tomography and aberration corrected scanning transmission electron microscopy are used to confirm that in Al-Mn nanocrystalline alloys deposited from an ionic liquid, Mn is slightly segregated at grain boundaries in the as-deposited condition. The apparent heat of grain boundary segregation is calculated to lie between 1100 and 1500 J mol-1 , which aligns reasonably well with a value calculated using a Miedema-based segregation model, and which is also in line with a more refined CALPHAD-type estimation if it is assumed that the Al-Mn deposits are not fully equilibrated at the deposition temperature.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grain boundary segregation in Al–Mn electrodeposits prepared from ionic liquid

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…Nanostructured Al-Mn alloy coating was then deposited using an electrochemical plating process in a nonaqueous system. 9,10 An electrical current was passed between two electrodes in the electrolyte to reduce the metal ions in the solution to form a solid metal coating on the truss. A periodic pulse waveform was tailored to achieve optimal deposit quality.…”

Section: Metal Depositionmentioning

confidence: 99%

“…Recently, an electrodepositable nanocrystalline aluminum-manganese alloy that exhibits unprecedented specific strength has been developed. 9 In this study, we combine this high-strength nanocrystalline aluminum alloy with optimized truss architectures, resulting in sandwich cores with exceptional performance. .…”

Section: Introductionmentioning

confidence: 99%

“…Aluminum alloys offer excellent specific strength due to their low density. Xtalic Corporation has developed a nanocrystalline aluminum-manganese alloy that achieves yield strength over 1300 MPa, 9 substantially higher than conventional wrought aluminum alloys; For example, Al 5056-H38 has yield strength of 345 MPa. While alloys with higher specific strength exist, they are typically difficult to roll into thin sheets and process into honeycombs due to their low ductility.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanocrystalline Aluminum Truss Cores for Lightweight Sandwich Structures

Schaedler

Chan²,

Clough

et al. 2017

JOM

View full text Add to dashboard Cite

Substitution of conventional honeycomb composite sandwich structures with lighter alternatives has the potential to reduce the mass of future vehicles. Here we demonstrate nanocrystalline aluminum-manganese truss cores that achieve 2-4 times higher strength than aluminum alloy 5056 honeycombs of the same density. The scalable fabrication approach starts with additive manufacturing of polymer templates, followed by electrodeposition of nanocrystalline Al-Mn alloy, removal of the polymer, and facesheet integration. This facilitates curved and net-shaped sandwich structures, as well as co-curing of the facesheets, which eliminates the need for extra adhesive. The nanocrystalline Al-Mn alloy thin-film material exhibits high strength and ductility and can be converted into a three-dimensional hollow truss structure with this approach. Ultra-lightweight sandwich structures are of interest for a range of applications in aerospace, such as fairings, wings, and flaps, as well as for the automotive and sports industries.

show abstract

Grain growth and second-phase precipitation in nanocrystalline aluminum–manganese electrodeposits

2017

Self Cite

View full text Add to dashboard Cite

The structural stability of nanocrystalline aluminum-manganese (Al-6.5 at.%. Mn) alloys is studied in the temperature range of 200 to 400 °C. Transmission electron microscopy shows that grain growth in this alloy is subdued by the presence of Mn, such that 100 nm or finer grain sizes can be retained at 200 and 300 °C even after 1 month of annealing. In contrast, the principal mode of instability in the alloy is the precipitation of the equilibrium Al 6 Mn phase, which was observed to form at much shorter time scales and is present at 300 and 400 °C after just 30 minutes. Differential scanning calorimetry was used to study the kinetics of the Al 6 Mn reaction using Johnson-Mehl-Avrami-Kolmogorov analysis and construct a time-temperaturetransformation (TTT) diagram for this process. It is found that this Al-Mn single-phase nanostructured alloy can be stable against forming the Al 6 Mn phase and against grain growth for several months below 200 °C and for short thermal excursions up to 300 °C.

show abstract

Towards electroformed nanostructured aluminum alloys with high strength and ductility

Abstract: Abstract

Cited by 17 publications

References 60 publications

Grain boundary segregation in Al–Mn electrodeposits prepared from ionic liquid

Grain boundary segregation in Al–Mn electrodeposits prepared from ionic liquid

Nanocrystalline Aluminum Truss Cores for Lightweight Sandwich Structures

Grain growth and second-phase precipitation in nanocrystalline aluminum–manganese electrodeposits

Contact Info

Product

Resources

About