Aluminium alloy compositions

S.W. Lim, Y. Nishida, "Superplasticity of whisker reinforced 2024 aluminium alloy composites fabricated by squeeze casting" Scr. Metall Mater. 32, 1911, 1995... 

Vo TP, Guan ZW, Cantwell WJ, Schleyer GK. Modelling of the low-impulse blast behaviour of fibre—metal laminates based on different aluminium alloys. Composites Part B 2012 44 141-51. 

Lightweight frame made from aircraft rade aluminium alloy, composite such as carbon fibre, or die-cast aluminium. The frame shown is a low profile machine, which decreases the wind resistance experienced by the rider. 

Landi, E., Casagrande, A., 1997. Production and characterisation of nicalon fiber/ aluminium alloy composites. Prakt. Metallogr. 34, 456. 

Suresh, S.M., Mishra, D., Srinivasan, A., Arunachalam, RA4., Sasikumar, R., 2007. Production and characterization of micto and nano AI2O3 particle-reinforced LM25 aluminium alloy composite. Journal of Engineering and Applied Sciences 6 (6). 

Developments focus on further improvements in aluminium alloy composition (i.e. higher strength, good formability and higher corrosion resistance). Research activities throughout the industry have resulted in concepts for ... 

Figure 22 Superplastic characteristics of (O) TiB2f/2014 and ( ) TiBjf/hOhl aluminium alloy composites. (a) (O) Rolling temperature 818 K, testing temperature 833 K, m = 0.25 ( ) roUing temperature 833 K, testing temperature 873 K, m = 0.26 and (b) (O) rolling temperature 833 K, testing temperature 873 K. (From Ref. 82.)...

T Imai, G L esperance, BD Hong, Y Tozawa. High strain rate superplasticity of T1B2 particulate reinforced aluminium alloy composite. J Mater Sci Lett 14 373, 1995. 

M. Kehler, Handbook ofi International Alloy Compositions and Designations, Vol. 3, Aluminium, Aluminium Vedag, Heyden, Germany, 1981. 

Composites of aluminium alloy with a thin cladding on one or both surfaces of a more anodic aluminium alloy or pure aluminium, enable sheet, plate and tube to be produced with special combinations of strength and corrosion resistance appropriate to service conditions. Although originally applied to high strength aircraft alloys, this principle of cladding is now utilised in several important industrial applications. 

Stress-corrosion cracking occurs in certain aluminium alloys which have been developed for medium and high strength by employing variations in composition, cold work and heat treatment The main alloys are based upon Al-Mg, Al-Mg and Al-Cu, but stress corrosion also occurs in Al-Ag, Al-Cu-Mg, Al-Mg-Si, Al-Zn and Al-Cu-Mg-Zn alloys. It has... 

In more recent work embrittlement in water vapour-saturated air and in various aqueous solutions has been systematically examined together with the influence of strain rate, alloy composition and loading mode, all in conjunction with various metallographic techniques. The general conclusion is that stress-corrosion crack propagation in aluminium alloys under open circuit conditions is mainly caused by hydrogen embrittlement, but that there is a component of the fracture process that is caused by dissolution. The relative importance of these two processes may well vary between alloys of different composition or even between specimens of an alloy that have been heat treated differently. 

In addition to examining pre-exposure effects, the slow strain-rate testing technique has been used increasingly to examine and compare the stress-corrosion susceptibility of aluminium alloys of various compositions, heat treatments and forms. A recent extensive review draws attention to differences in response to the various groups of commonly employed alloys which are summarised in Fig. 8.57. The most effective test environment was found to be 3 Vo NaCl -F 0.3 Vo HjOj. The most useful strain rate depends upon the alloy classification. 

Intermediate alloy compositions include a zinc-15%-aluminium alloy for metal spraying (higher aluminium contents are unsuitable for spraying wire) and a zinc-30%-aluminium-0.2%-magnesium-0.2%-silicon coating (Lavegal) for sheet. 

Alclad a composite in which a thin layer of aluminium, or an aluminium alloy of good corrosion resistance, is bonded metallurgically to a high-strength aluminium alloy (of lower corrosion resistance) to provide a combination of these two properties. 

Commercial alloys composition, nomenclature. A simple and general way of identification of a commercial alloy (or of a group of similar alloys) consists of a label which gives (as rounded values) the mass% contents of the main components indicated by their chemical symbols. The alloy, for instance, Ti-6A1-4V, is a titanium-based alloy typically containing 6 mass% aluminium and 4 mass% vanadium. 

The properties of unidirectional composites in the fibre direction can compete with those of current metals and alloys. The highest-performance engineering plastics compete with magnesium and aluminium alloys. 

Thus, in summary, the composition can be divided into propellant, emitter and additives. The propellant is invariably gunpowder, whilst the emitter might be carbon, steel, iron, aluminium, magnesium/ aluminium alloy or even titanium. Additives are often used to promote the visual effects and to cheapen the composition. 

Metals such as aluminium, steel, and titanium are the primary adherends used for adhesively bonded structure. They are never bonded directly to a polymeric adhesive, however. A protective oxide, either naturally occurring or created on the metal surface either through a chemical etching or anodization technique is provided for corrosion protection. The resultant oxide has a morphology distinct from the bulk and a surface chemistry dependent on the conditions used to form the oxide 39). Studies on various aluminum alloy compositions show that while the oxide composition is invariant with bulk composition, the oxide surface contains chemical species that are characteristic of the base alloy and the anodization bath40 42). 

Aluminium alloys well with up to about 3-5 per cent, of tantalum, which has no effect, however, on the mechanical strength, ductility, and working properties of aluminium.3 Reduction of tantalum pentoxide by the thermite process yields hard, brittle alloys.1 A substance the composition of which corresponds with the formula TaAls has been obtained by reducing potassium tantalum fluoride, K2TaF7, with aluminium filings at a high temperature. It is described as an iron-grey crystalline powder, of density 7-02, which is scarcely attacked by acids.5... 

---