Duralumin
Duralumin (also called duraluminum, duralum, duraluminium, duralium or dural) is the trade name of one of the earliest types of age-hardenable aluminium alloys.
Alloying elements
The main alloying constituents are copper, manganese, and magnesium. A commonly used modern equivalent of this alloy type is AA2024, which contains 4.4% copper, 1.5% magnesium, 0.6% manganese and 93.5% aluminium by weight. Typical yield strength is 450 MPa (65 ksi), with variations depending on the composition and temper.[1]
History
Duralumin was developed by the German metallurgist Alfred Wilm at Dürener Metallwerke Aktien Gesellschaft.
In 1903, Wilm discovered that after quenching, an aluminium alloy containing 4% copper would slowly harden when left at room temperature for several days. Further improvements led to the introduction of duralumin in 1909.[2] The name is obsolete today, and mainly used in popular science to describe the Al-Cu alloy system, or '2000' series, as designated by the International Alloy Designation System (IADS) originally created in 1970 by the Aluminum Association.
Aviation applications
The earliest known attempt to use duralumin for a heavier-than-air aircraft structure occurred in 1916, when Hugo Junkers first introduced its use in the creation of the Junkers J 7's airframe, a single-engined monoplane that marked the first use of the Junkers trademark duralumin corrugated skinning. Only the covered wings and tubular fuselage framework of the J 3 were ever completed, before the project was abandoned - the slightly later Junkers J.I armored sesquiplane had its all-metal wings and horizontal stabilizer made in the same manner as the J 3's wings had been, along with the experimental and airworthy all-duralumin Junkers J 7 single seat fighter design, which led to the Junkers D.I low-wing monoplane fighter introducing all-duralumin aircraft structural technology to German military aviation in 1918.
Corrosion protection
Although the addition of copper improves strength, it also makes these alloys susceptible to corrosion. For sheet products, corrosion resistance can be greatly enhanced by metallurgical bonding of a high-purity aluminium surface layer. These sheets are referred to as alclad, and are commonly used by the aircraft industry.[5]
Applications
List of typical uses for the wrought Al-Cu alloys:[1]
- 2011: Wire, rod, and bar for screw machine products. Applications where good machinability and good strength are required.
- 2014: Heavy-duty forgings, plate, and extrusions for aircraft fittings, wheels, and major structural components, space booster tankage and structure, truck frame and suspension components. Applications requiring high strength and hardness including service at elevated temperatures.
- 2024: Aircraft structures, rivets, hardware, truck wheels, screw machine products, and other structural applications.
- 2036: Sheet for auto body panels.
- 2048: Sheet and plate in structural components for aerospace application and military equipment.
- 2141: Plate in thicknesses of 40 to 150 mm (1.6 to 5.9 in) for aircraft structures.
- 2218: Forgings; aircraft and diesel engine pistons; aircraft engine cylinder heads; jet engine impellers and compressor rings.
- 2219: Welded space booster oxidizer and fuel tanks, supersonic aircraft skin and structure components. Readily weldable and useful for applications over temperature range of −270 to 300 °C (−454.00 to 572.00 °F). Has high fracture toughness, and the T8 temper is highly resistant to stress-corrosion cracking.
- 2618: Die and hand forgings. Pistons and rotating aircraft engine parts for operation at elevated temperatures. Tire molds.
References
- ↑ 1.0 1.1 ASM Handbook. Volume 2, In Properties and Selection: Nonferrous alloys and special purpose materials. ASM, 2002.
- ↑ J. Dwight. Aluminium Design and Construction. Routledge, 1999.
- ↑ Burton, Walter E. (October 1929). "The Zeppelin Grows Up". Popular Science Monthly: 26.
- ↑ "The Great Airships" Century of Flight
- ↑ J. Snodgrass and J. Moran. Corrosion Resistance of Aluminum Alloys. In Corrosion: Fundamentals, Testing and Protection, volume 13a of ASM Handbook. ASM, 2003.
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