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2024 aluminium alloy
Aluminium alloy 2024 is an aluminium alloy, with copper as the primary alloying element. It is used in applications requiring high strength to weight ratio, as well as good fatigue resistance. It is weldable only through friction welding, and has average machinability. Due to poor corrosion resistance, it is often clad with aluminium or Al-1Zn for protection, although this may reduce the fatigue strength.〔〔Parker, Dana T. ''Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II,'' p. 39, 87, 118, Cypress, CA, 2013. ISBN 978-0-9897906-0-4.〕 In older systems of terminology, this alloy was named 24ST.
2024 is commonly extruded, and also available in alclad sheet and plate forms. It is not commonly forged (the related 2014 aluminum alloy is, though).〔Marks' Standard handbook for Mechanical Engineers, 8th Ed., McGraw Hill, pp. 6-52 and 6-57〕
== Basic properties ==
Aluminium alloy 2024 has a density of 2.78 g/cm³ (0.1 lb/in³), electrical conductivity of 30% IACS, Young's Modulus of 73 GPa (10.6 Msi) across all tempers, and begins to melt at .〔(Material Properties Data: 2024 Aluminum ) - retrieved 19 April 2010.〕
2024 aluminium alloy's composition roughly includes 4.3-4.5% copper, 0.5-0.6% manganese, 1.3-1.5% magnesium and less than a half a percent of silicon, zinc, nickel, chromium, lead and bismuth.
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