Aluminum Alloy Compositions

J. Koike, M. Mabuchi, and K. Higashi, "In-Situ Observation of Partial Melting in Superplastic Aluminum Alloy Composites at x.igh Temperatures," Acta Metall Mater., 43(1) 199 (1994). 

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). 

Limits on aluminum alloy composition are mainly driven by recycling concerns. Aluminum cannot be readily refined to remove secondary elements without added cost. As a result, when developing composites, auto manufacturers try to limit applications to one or two alloy systems.1... 

In addition to recycling costs, the costs of aluminum stampings have also placed limitations on additional use of aluminum alloy composites in lightweight vehicles. 

Cheng HM, Akiyama S, Kitahara A, Kobayashi K, Zhou BL, The tensile strength of earbon-fiber reinforced 6061 aluminum-alloy composites in as-casted and T6-treated states, Scripta... 

Composition of Wrought Coppers and Copper Alloys Classification of Copper and Copper Alloys Aluminum Alloys Composition Ranges for Cast Aluminum Alloys Composition Ranges for Wrought Aluminum Alloys Tin Alloys... 

Molten cryohte dissolves many salts and oxides, forming solutions of melting point lower than the components. Figure 1 combines the melting point diagrams for cryolite—A1F. and for cryohte—NaF. Cryohte systems ate of great importance in the HaH-Heroult electrolysis process for the manufacture of aluminum (see Aluminumand ALUMINUM alloys). Table 5 Hsts the additional examples of cryohte as a component in minimum melting compositions. 

Metals andMllojs Aluminum Association 900 19th Street, NW Washington, D.C. 20006 Standards for wrought and cast aluminum and aluminum alloy products, including composition, temper designation, dimensional tolerance, etc. 

An important appHcation of MMCs in the automotive area is in diesel piston crowns (53). This appHcation involves incorporation of short fibers of alumina or alumina—siHca in the crown of the piston. The conventional diesel engine piston has an Al—Si casting alloy with a crown made of a nickel cast iron. The replacement of the nickel cast iron by aluminum matrix composite results in a lighter, more abrasion resistant, and cheaper product. Another appHcation in the automotive sector involves the use of carbon fiber and alumina particles in an aluminum matrix for use as cylinder liners in the Prelude model of Honda Motor Co. 

Zinc slush-casting alloy compositions are based on the Zn—A1 system. The two commonly used alloys have nominal aluminum contents of 4.75%... 

Beryllium and aluminum are virtually insoluble in one another in the soHd state. The potential therefore exists for an aluminum—beryllium metal matrix composite with lower density and higher elastic modulus, ie, improved specific modulus, than conventional aluminum alloys produced by ingot or powder metal processing. At least one wrought composite system with nominally 62 wt % Be and 38 wt % A1 has seen limited use in aerospace appheations (see Composites). 

Table 6-3 Composition (wt.%) and properties of aluminum alloys for anodes...

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