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6061 aluminium alloy
Nov 01, 2016

6061 aluminium alloy

 

6061 is a precipitation hardening aluminium alloy, containing magnesium and silicon as its major alloying elements. Originally called "Alloy 61S," it was developed in 1935. It has good mechanical properties and exhibits good weldability. It is one of the most common alloys of aluminium for general purpose use.

It is commonly available in pre-tempered grades such as 6061-O (annealed) and tempered grades such as 6061-T6 (solutionized and artificially aged) and 6061-T651 (solutionized, stress-relieved stretched and artificially aged).

·          Basic properties

6061 has a density of 2.70 g/cm3 (0.0975 lb/in3).

Chemical composition

The alloy composition of 6061 is:

·         Silicon minimum 0.4%, maximum 0.8% by weight

·         Iron no minimum, maximum 0.70%

·         Copper minimum 0.15%, maximum 0.40%

·         Manganese no minimum, maximum 0.15%

·         Magnesium minimum 0.8%, maximum 1.2%

·         Chromium minimum 0.04%, maximum 0.35%

·         Zinc no minimum, maximum 0.25%

·         Titanium no minimum, maximum 0.15%

·         Other elements no more than 0.05% each, 0.15% total

·         Remainder Aluminium (95.85%–98.56%)

 

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Mechanical properties

The mechanical properties of 6061 depend greatly on the temper, or heat treatment, of the material. Young's Modulus is 10×106 psi (69 GPa) regardless of temper.

6061

Annealed 6061 (6061-O temper) has maximum tensile strength no more than 18,000 psi (125 MPa), and maximum yield strengthno more than 8,000 psi (55 MPa). The material has elongation (stretch before ultimate failure) of 25–30%.

6061-T4

T4 temper 6061 has an ultimate tensile strength of at least 30,000 psi (207 MPa) and yield strength of at least 16,000 psi (110 MPa). It has elongation of 16%.

6061-T6

T6 temper 6061 has an ultimate tensile strength of at least 42,000 psi (300 MPa) and yield strength of at least 35,000 psi (241 MPa). More typical values are 45,000 psi (310 MPa) and 40,000 psi (275 MPa), respectively.[4] In thicknesses of 0.250 inch (6.35 mm) or less, it has elongation of 8% or more; in thicker sections, it has elongation of 10%. T651 temper has similar mechanical properties. The typical value for thermal conductivity for 6061-T6 at 77°F is around 152 W/m K. A material data sheet[5] defines the fatigue limit under cyclic load as 14,000 psi (100 MPa) for 500,000,000 completely reversed cycles using a standard RR Moore test machine and specimen. Note that aluminum does not exhibit a well defined "knee" on its S-n graph, so there is some debate as to how many cycles equates to "infinite life". Also note the actual value of fatigue limit for an application can be dramatically affected by the conventional de-rating factors of loading, gradient, and surface finish. The properties of Aluminum are to be pertaining till the austinite temperature reaches and so martensitic hardening is prevented in all form of polycrystalline structures .


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