Английская Википедия:5086 aluminium alloy
5086 aluminium alloy is an aluminium–magnesium 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.[1]
Basic properties
5086 has a density of Шаблон:Convert, with a specific gravity of 2.66.
Melting point is Шаблон:Convert.
Chemical properties
The alloy composition of 5086 is:[2]
- 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
- Remainder Aluminium
Mechanical properties
The mechanical properties of 5086 vary significantly with hardening and temperature.[2]
–O hardening
Unhardened 5086 has a yield strength of Шаблон:Convert and ultimate tensile strength of Шаблон:Convert from Шаблон:Convert. At cryogenic temperatures it is slightly stronger: at Шаблон:Convert, yield of Шаблон:Convert and ultimate tensile strength of Шаблон:Convert; above Шаблон:Convert its strength is reduced.
Elongation, the strain before material failure, ranges from 46% at Шаблон:Convert, 35% at Шаблон:Convert, 32% at Шаблон:Convert, 22% at Шаблон:Convert, 30% at Шаблон:Convert, 36% at Шаблон:Convert, and increases above there.
–H32 hardening
H32 strain hardened 5086, with properties measured at Шаблон:Convert, has yield strength of Шаблон:Convert, ultimate tensile strength of Шаблон:Convert, and elongation of 6-12%.
–H34 hardening
–H112 hardening
–H116 hardening
H116 strain hardened 5086, with properties measured at Шаблон:Convert, has yield strength of Шаблон:Convert, ultimate tensile strength of Шаблон:Convert, and elongation of 12%.
Uses
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.[1]
5086 has a tendency to undergo Stress corrosion cracking and is not used much in aircraft construction as a result.[3]
5086 has been used in vehicle armor, notably in the M113 Armored Personnel Carrier and M2 Bradley Infantry fighting vehicle.
Welding
5086 is often assembled using arc welding, typically MIG or TIG welding. The newer technique of Friction stir welding has 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 Шаблон:Convert ambient temperature, yield strength decreases from Шаблон:Convert to Шаблон:Convert and ultimate strength from Шаблон:Convert. The relatively low decrease in ultimate strength (about 10%) is extremely good performance for an aluminium alloy.
References
Further reading
- "Properties of Wrought Aluminum and Aluminum Alloys: 5086, Alclad 5086", Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, Vol 2, ASM Handbook, ASM International, 1990, p. 93-4.
Aluminium alloy table
- ↑ 1,0 1,1 Boatbuilding with Aluminum, Stephen F. Pollard, 1993, Шаблон:ISBN
- ↑ 2,0 2,1 5086 Material properties at supplliersonline.com, accessed October 29, 2006
- ↑ 5xxx Plate information sheet Шаблон:Webarchive at www.alcoa.com, accessed October 29, 2006
