An aluminium alloy (UK/IUPAC) or aluminum alloy (NA; see spelling differences) is an alloy in which aluminium (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin, nickel and zinc. There are two principal classifications, namely casting alloys and wrought alloys, both of which are further subdivided into the categories heat-treatable and non-heat-treatable. About 85% of aluminium is used for wrought products, for example rolled plate, foils and extrusions. Cast aluminium alloys yield cost-effective products due to their low melting points, although they generally have lower tensile strengths than wrought alloys. The most important cast aluminium alloy system is Al–Si, where the high levels of silicon (4–13%) contribute to give good casting characteristics. Aluminium alloys are widely used in engineering structures and components where light weight or corrosion resistance is required.I. J. Polmear, Light Alloys, Arnold, 1995
Alloys composed mostly of aluminium have been very important in aerospace manufacturing since the introduction of metal-skinned aircraft. Aluminium–magnesium alloys are both lighter than other aluminium alloys and much less flammable than other alloys that contain a very high percentage of magnesium.
Aluminium alloy surfaces will develop a white, protective layer of aluminium oxide when left unprotected by anodizing or correct painting procedures. In a wet environment, galvanic corrosion can occur when an aluminium alloy is placed in electrical contact with other metals with more positive corrosion potentials than aluminium, and an electrolyte is present that allows ion exchange. Also referred to as dissimilar-metal corrosion, this process can occur as exfoliation or as intergranular corrosion. Aluminium alloys can be improperly heat-treated, causing internal element separation which corrodes the metal from the inside out.
Aluminium alloy compositions are registered with The Aluminum Association. Many organizations publish more specific standards for the manufacture of aluminium alloys, including the SAE International standards organization, specifically its aerospace standards subgroups,SAE aluminium specifications list, accessed 8 October 2006. Also SAE Aerospace Council , accessed 8 October 2006. and ASTM International.
Engineering use & properties
Aluminium alloys with a wide range of properties are used in engineering structures. Alloy systems are classified by a number system (ANSI) or by names indicating their main alloying constituents (DIN and ISO). Selecting the right alloy for a given application entails considerations of its tensile strength, density, ductility, formability, workability, weldability, and corrosion resistance, to name a few. A brief historical overview of alloys and manufacturing technologies is given in.R.E. Sanders, Technology Innovation in aluminium Products, The Journal of The Minerals, 53(2):21–25, 2001. Online ed. Aluminium alloys are used extensively in aircraft due to their high strength-to-weight ratio. Pure aluminium is much too soft for such uses, and it does not have the high tensile strength that is needed for building airplanes and helicopters.
Aluminium alloys versus types of steel Aluminium alloys typically have elastic moduli of about 70 GPa, which is about one-third of the elastic modulus of steel alloys. Therefore, for a given load, a component or unit made of an aluminium alloy will experience a greater deformation in the elastic regime than a steel part of identical size and shape. With completely new metal products, the design choices are often governed by the choice of manufacturing technology. Extrusions are particularly important in this regard, owing to the ease with which aluminium alloys, particularly the Al-Mg-Si series, can be extruded to form complex profiles.
In general, stiffer and lighter designs can be achieved with aluminium alloys than is feasible with steels. For instance, consider the bending of a thin-walled tube: the second moment of area is inversely related to the stress in the tube wall; that is, stresses are lower for larger values. The second moment of area is proportional to the cube of the radius times the wall thickness, so increasing the radius (and weight) by 26% will lead to a halving of the wall stress. For this reason, bicycle frames made of aluminium alloys make use of larger tube diameters than steel or titanium in order to yield the desired stiffness and strength. In automotive engineering, cars made of aluminium alloys employ space frames made of extruded profiles to ensure rigidity. This represents a radical change from the common approach for current steel car design, which depend on the body shells for stiffness, known as unibody design.
Aluminium alloys are widely used in automotive engines, particularly in engine blocks and crankcases due to the weight savings that are possible. Since aluminium alloys are susceptible to warping at elevated temperatures, the cooling system of such an engine is critical. Manufacturing techniques and metallurgical advancements have also been instrumental for successful applications in automotive engines. In the 1960s, the aluminium cylinder heads of the Chevrolet Corvair earned a reputation for failure and stripping of threads, which is not seen in current aluminium cylinder heads.
An important structural limitation of aluminium alloys is their lower fatigue strength compared to steel. In controlled laboratory conditions, steels display a fatigue limit, which is the stress amplitude below which no failures occur – the metal does not continue to weaken with extended stress cycles. Aluminium alloys do not have this lower fatigue limit and will continue to weaken with continued stress cycles. Aluminium alloys are therefore sparsely used in parts that require high fatigue strength in the high-cycle regime (more than 107 stress cycles).
Heat sensitivity considerations Often, the metal's sensitivity to heat must also be considered. Even a relatively routine workshop procedure involving heating is complicated by the fact that aluminium, unlike steel, will melt without first glowing red. Forming operations where a blow torch is used can reverse or remove the effects of heat treatment. No visual signs reveal how the material is internally damaged. Much like welding heat-treated, high-strength link chain, all strength is now lost by heat of the torch. The chain is dangerous and must be discarded.
Aluminium is subject to internal stresses and strains. Sometimes years later, improperly welded aluminium bicycle frames may gradually twist out of alignment from the stresses of the welding process. Thus, the aerospace industry avoids heat altogether by joining parts with rivets of like-metal composition, other fasteners, or adhesives.
Stresses in overheated aluminium can be relieved by heat-treating the part in an oven and gradually cooling it—in effect annealing the stresses. Yet these parts may still become distorted, so that heat-treating of welded bicycle frames, for instance, can result in a significant fraction becoming misaligned. If the misalignment is not too severe, the cooled parts may be bent into alignment. If the frame is properly designed for rigidity (see above), that bending will require enormous force.
Aluminium's intolerance of high temperatures has not precluded its use in rocketry, even for use in constructing combustion chambers where gases can reach 3500 K. The RM-81 Agena upper-stage engine used a regeneratively cooled aluminium design for some parts of the nozzle, including the thermally critical throat region; in fact, the extremely high thermal conductivity of aluminium prevented the throat from reaching the melting point even under massive heat flux, resulting in a reliable, lightweight component.
Household wiring
Because of its high conductivity and relatively low price compared with copper in the 1960s, aluminium was introduced at that time for household electrical wiring in North America, even though many fixtures had not been designed to accept aluminium wire. But the new use brought some problems:
The greater coefficient of thermal expansion of aluminium causes the wire to expand and contract relative to the dissimilar-metal screw connection, eventually loosening the connection. Pure aluminium has a tendency to creep under steady sustained pressure (to a greater degree as the temperature rises), again loosening the connection. Galvanic corrosion from the dissimilar metals increases the electrical resistance of the connection.
All of this resulted in overheated and loose connections, and this in turn resulted in some fires. Builders then became wary of using the wire, and many jurisdictions outlawed its use in very small sizes, in new construction. Yet newer fixtures were eventually introduced with connections designed to avoid loosening and overheating. At first they were marked "Al/Cu", but they now bear a "CO/ALR" coding.
Another way to forestall the heating problem is to crimp the short "pigtail" of copper wire. A properly done high-pressure crimp by the proper tool is tight enough to reduce any thermal expansion of the aluminium. Today, new alloys, designs, and methods are used for aluminium wiring in combination with aluminium terminations.
Alloy designations Wrought and cast aluminium alloys use different identification systems. Wrought aluminium is identified with a four-digit number which identifies the alloying elements.
Cast aluminium alloys use a four-to-five-digit number with a decimal point. The digit in the hundreds place indicates the alloying elements, while the digit after the decimal point indicates the form (cast shape or ingot).
Temper designation The temper designation follows the cast or wrought designation number with a dash, a letter, and potentially a one-to-three-digit number, e.g. 6061-T6. The definitions for the tempers are:
-F : As fabricated -H : Strain-hardened (cold worked) with or without thermal treatment -H1 : Strain-hardened without thermal treatment -H2 : Strain-hardened and partially annealed -H3 : Strain-hardened and stabilized by low-temperature heating -H4 : Strain-hardened, then lacquered/painted Second digit : A second digit denotes the degree of hardness -HX2 = 1/4 hard -HX4 = 1/2 hard -HX6 = 3/4 hard -HX8 = full hard -HX9 = extra hard -O : Full soft (annealed) -T : Heat-treated to produce stable tempers -T1 : Cooled from hot-working and naturally aged (at room temperature) -T2 : Cooled from hot-working, cold-worked, and naturally aged -T3 : Solution heat-treated and cold worked -T4 : Solution heat-treated and naturally aged -T5 : Cooled from hot-working and artificially aged (at elevated temperature) -T51 : Stress relieved by stretching -T510 : No further straightening after stretching -T511 : Minor straightening after stretching -T52 : Stress relieved by thermal treatment -T6 : Solution heat-treated and artificially aged -T651 : Solution heat-treated, stress relieved by stretching, and artificially aged -T7 : Solution heat-treated and stabilized -T8 : Solution heat-treated, cold-worked, and artificially aged -T9 : Solution heat-treated, artificially aged, and cold-worked -T10 : Cooled from hot-working, cold-worked, and artificially aged -W : Solution heat-treated only
Note: -W is a relatively soft intermediary designation that applies after heat treat and before aging is completed. The -W condition can be extended at extremely low temperatures but not indefinitely and depending on the material will typically last no longer than 15 minutes at ambient temperatures.
Wrought alloys