5086 aluminum
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 vessel gangways, building boat and yacht hulls.
5086 has a density of 2,660 kg/m3 (0.096 lb/cu in), with a specific gravity of 2.66.
Melting point is 590 °C (1,090 °F).
The alloy composition of 5086 is:
The mechanical properties of 5086 vary significantly with hardening and temperature.
Unhardened 5086 has a yield strength of 120 MPa (17 ksi) and ultimate tensile strength of 260 MPa (38 ksi) from −28 to 100 °C (−18 to 212 °F). At cryogenic temperatures it is slightly stronger: at −196 °C (−321 °F), yield of 130 MPa (19 ksi) and ultimate tensile strength of 380 MPa (55 ksi); above 100 °C (212 °F) its strength is reduced.
Elongation, the strain before material failure, ranges from 46% at −196 °C (−321 °F), 35% at −80 °C (−112 °F), 32% at −28 °C (−18 °F), 22% at 20 °C (68 °F), 30% at 24 °C (75 °F), 36% at 100 °C (212 °F), and increases above there.
H116 strain hardened 5086, with properties measured at 20 °C (68 °F), has yield strength of 210 MPa (30 ksi), ultimate tensile strength of 290 MPa (42 ksi), and elongation of 12%.
5086 is the preferred hull material for small aluminium boats or larger yachts. Its high strength and good corrosion resistance make it an excellent match for yachting.
5086 has a tendency to undergo Stress corrosion cracking and is not used much in aircraft construction as a result.
5086 has been used in vehicle armor, notably in the M113 Armored Personnel Carrier and M2 Bradley Infantry fighting vehicle.
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