Aluminium-lithium alloys

Lavernia, Enrique J.; Grant, N.J.

doi:10.1007/bf01132370

Cited by 210 publications

(79 citation statements)

References 16 publications

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“…Although the atomic volume of Li is 20% larger than that of Al, addition of Li to Al initially causes a contraction of a vs. x, which we also find in quantitative agreement with experiment. 16,40,42 Various experimental a's reported 16,[40][41][42] are indicated by symbols, including Al-rich A1 and δ ′ (Al 3 Li) precipitates. First, our calculated a for pure Al at 0 K is in agreement with experiment.…”

Section: Lattice Constantsmentioning

confidence: 99%

“…The β AlLi, for example, is a promising candidate as an anodic material in highenergy density batteries; δ ′ , which appears in the miscibility gap between Al and β, is used to precipitationharden commercial alloys. [15][16][17] Substituting Li for Al not only makes the alloy less dense but increases unexpectedly the elastic moduli 18 even though the Young's modulus of Li (14 GPa) is seven times smaller than that of Al (91 GPa). Also, the valence density leads to a bulk modulus of Al (83 GPa) five times larger than that of Li (15 GPa), giving rise to a sensitivity to basis sets if density is not represented properly.…”

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confidence: 99%

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Structural properties and relative stability of (meta)stable ordered, partially ordered, and disordered Al-Li alloy phases

Alam

Johnson

2012

Phys. Rev. B

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We resolve issues that have plagued reliable prediction of relative phase stability for solid-solutions and compounds. Due to its commercially important phase diagram, we showcase Al-Li system because historically density-functional theory (DFT) results show large scatter and limited success in predicting the structural properties and stability of solid-solutions relative to ordered compounds. Using recent advances in an optimal basis-set representation of the topology of electronic charge density (and, hence, atomic size), we present DFT results that agree reasonably well with all known experimental data for the structural properties and formation energies of ordered, off-stoichiometric partially-ordered and disordered alloys, opening the way for reliable study in complex alloys.

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Section: Lattice Constantsmentioning

confidence: 99%

mentioning

confidence: 99%

Structural properties and relative stability of (meta)stable ordered, partially ordered, and disordered Al-Li alloy phases

Alam

Johnson

2012

Phys. Rev. B

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“…Alloying elements, such as Cu, Mg, Si, Cu, Pb, Sn and Sb, and reinforcing phases, such as SiC, Al 2 O 3 or B 4 C, are suitable for changing the microstructure and forming phases that improve the hardening response. 1,2 For example, the addition of ,1 wt-%Mg facilitates the breakup of the surface oxide layer by forming MgAl 2 O 4 during sintering, giving a sintered density gain with increasing mechanical properties. 3,4 Increasing the Mg content up to 3?5 wt-% in a 7000 series alloy offers even better properties.…”

Section: Introductionmentioning

confidence: 99%

Sintering behaviour of Al-6061 powder produced by rapid solidification process

et al. 2011

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Complex aluminium alloy components fabricated by powder metallurgy (P/M) offer the promise of a low cost and high strength-to-weight ratio, which meets the demands of the automotive sector. This paper describes the die compaction and sintering response of an atomised Al-6061 alloy powder containing Mg and Si produced by rapid solidification. A design of experiments is used involving three levels each of the die compaction pressure, sintering temperature, peak temperature hold time and heating rate. Three trials were used to obtain the optimum press sinter processing conditions. Besides the mechanical properties, phase transformation and microstructure are investigated. Supplemental insight is gained through thermogravimetric analysis, differential scanning calorimetry and SEM with energy dispersive spectroscopy. Analysis of variation is used to quantify the contribution of each design variables to the mechanical properties.

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“…Al-Li alloys, with the possible addition of other elements, are also of great technological interest due to their high strength-toweight ratio. 25 For these fundamental and practical reasons, the electronic structure and the nature of bonding in Al-Li alloys have drawn considerable interest. [26][27][28] Insofar as the Compton scattering technique is concerned, relatively little by the way of high-resolution work on disordered alloys is available in the literature despite the fact that, unlike traditional spectroscopies which rely on quantum oscillatory phenomena, Compton scattering is not affected by short electron mean free paths and is thus particularly suited for investigating disordered alloys.…”

Section: ͑13͒mentioning

confidence: 99%

Two-dimensional folding technique for enhancing Fermi surface signatures in the momentum density: Application to Compton scattering data from an Al-3 at. % Li disordered alloy

et al. 2001

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We present a technique for enhancing Fermi surface ͑FS͒ signatures in the two-dimensional ͑2D͒ distribution obtained after the 3D momentum density in a crystal is projected along a specific direction in momentum space. These results are useful for investigating fermiology via high-resolution Compton scattering and positron annihilation spectroscopies. We focus on the particular case of the ͑110͒ projection in a fcc crystal where the standard approach based on the use of the Lock-Crisp-West ͑LCW͒ folding theorem fails to give a clear FS image due to the strong overlap with FS images obtained through projection from higher Brillouin zones. We show how these superposed FS images can be disentangled by using a selected set of reciprocal lattice vectors in the folding process. The applicability of our partial folding scheme is illustrated by considering Compton spectra from an Al-3 at. % Li disordered alloy single crystal. For this purpose, high-resolution Compton profiles along nine directions in the ͑110͒ plane were measured. Corresponding highly accurate theoretical profiles in Al-3 at. % Li were computed within the local density approximation ͑LDA͒-based Korringa-KohnRostoker coherent potential approximation ͑KKR-CPA͒ first-principles framework. A good level of overall accord between theory and experiment is obtained, some expected discrepancies reflecting electron correlation effects notwithstanding, and the partial folding scheme is shown to yield a clear FS image in the ͑110͒ plane in Al-3 at. % Li.

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Aluminium-lithium alloys

Cited by 210 publications

References 16 publications

Structural properties and relative stability of (meta)stable ordered, partially ordered, and disordered Al-Li alloy phases

Structural properties and relative stability of (meta)stable ordered, partially ordered, and disordered Al-Li alloy phases

Sintering behaviour of Al-6061 powder produced by rapid solidification process

Two-dimensional folding technique for enhancing Fermi surface signatures in the momentum density: Application to Compton scattering data from an Al-3 at. % Li disordered alloy

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