- 5086 aluminium alloy
5086 is an
aluminium alloy, primarily alloyed with magnesium. It is not strengthened by heat treatment, instead becoming stronger due to strain hardening, or cold mechanical working of the material.
Since heat treatment doesn't strongly affect the strength, 5086 can be readily welded and retain most of its mechanical strength. The good results with welding and good corrosion properties in seawater make 5086 extremely popular for building boat and yacht hulls.Boatbuilding with Aluminum, Stephen F. Pollard, 1993, ISBN 978-0-07-050426-4]
The alloy composition of 5086 is: [http://www.suppliersonline.com/propertypages/5086.asp 5086 Material properties] at supplliersonline.com, accessed Oct 29, 2006]
Chromium- 0.05% - 0.25% by weight
Copper- 0.1% maximum
Iron- 0.5% maximum
Magnesium- 3.5% - 4.5%
Manganese- 0.2% - 0.7%
Silicon- 0.4% maximum
Titanium- 0.15% maximum
Zinc- 0.25% maximum
* Others each 0.05% maximum
* Others total 0.15% maximum
Unhardened 5086 has a
yield strengthof 17 ksi (17,000 psi; 117 MPa) and ultimate tensile strength of 38 ksi (262 MPa) from –18 °F (–28 °C) to over 212 °F (100 °C). At cryogenictemperatures it is slightly stronger: at –320 °F (–196 °C or 78 K), yield of 19 ksi (131 MPa) and ultimate tensile strength of 55 ksi (379 MPa); above 212 °F (100 °C) its strength is reduced.
Elongation, the strain before material failure, ranges from 46% at –320 °F (–196 °C), 35% at –112 °F (–80 °C), 32% at –18 °F (–28 °C), 22% at 68 °F (20 °C), 30% at 75 °F (24 °C), 36% at 212 °F (100 °C), and increases above there.
H116 strain hardened 5086, with properties measured at 68 °F (20 °C), has yield strength of 30 ksi (207 MPa), ultimate tensile strength of 42 ksi (290 MPa), and elongation of 12%.
5086 has a tendency to undergo
Stress corrosion crackingand is not used much in aircraft construction as a result. [http://www.alcoa.com/mill_products/catalog/pdf/general_engineering_plates/en/5xxx_EN.pdf 5xxx Plate information sheet] at www.alcoa.com, accessed Oct 29, 2006]
5086 has been used in vehicle armor, notably in the
M113 Armored Personnel Carrierand M2 BradleyInfantry fighting vehicle.
5086 is often assembled using
arc welding, typically MIG or TIGwelding. The newer technique of Friction stir weldinghas also been successfully applied but is not in common use.
Arc welding reduces mechanical properties to no worse than –O hardening condition. For –H116 base material, measured at 68 °F (20 °C) ambient temperature, yield strength decreases from 30 ksi (207 MPa) to 17 ksi (117 MPa) and ultimate strength from 42 ksi (290 MPa) to 38 ksi (262 MPa). The relatively low decrease in ultimate strength (about 10%) is extremely good performance for an aluminium alloy.
Wikimedia Foundation. 2010.
Look at other dictionaries:
Aluminium alloy — Aluminium alloys are alloys of aluminium, often with copper, zinc, manganese, silicon, or magnesium. They are much lighter and more corrosion resistant than plain carbon steel, but not quite as corrosion resistant as pure aluminium. Bare… … Wikipedia
Volvo Super Olympian — Volvo Super Olympian, also known as B10TL, is the low floor replacement of the 3 axle version of Volvo Olympian double decker bus (its 2 axle version was replaced by Volvo B7TL).It was unveiled in 1998, with one chassis being sent to Hong Kong… … Wikipedia
aluminum processing — Introduction preparation of the ore for use in various products. Aluminum, or aluminium (Al), is a silvery white metal with a melting point of 660° C (1,220° F) and a density of 2.7 grams per cubic centimetre. The most abundant… … Universalium