Aluminium Alloy 6061 - Composition, Properties, Temper and Applications of 6061 Aluminium

Topics Covered

Background

Composition

Key Properties

Physical Properties

Mechanical Properties

Thermal Properties

Electrical Properties

Typical Heat Treatment/Temper States

Typically Available Forms

Applications

Background

Aluminium alloy 6061 is one of the most extensively used of the 6000 series aluminium alloys. It is a versatile heat treatable extruded alloy with medium to high strength capabilities.

Composition

Table 1. Typical composition of aluminium alloy 6061

Component

Amount (wt.%)

Aluminium

Balance

Magnesium

0.8-1.2

Silicon

0.4 – 0.8

Iron

Max. 0.7

Copper

0.15-0.40

Zinc

Max. 0.25

Titanium

Max. 0.15

Manganese

Max. 0.15

Chromium

0.04-0.35

Others

0.05

Key Properties

Typical properties of aluminium alloy 6061 include:

         Medium to high strength

         Good toughness

         Good surface finish

         Excellent corrosion resistance to atmospheric conditions

         Good corrosion resistance to sea water

         Can be anodized

         Good weldability and brazability

         Good workability

         Widely available

Note: Property data is provided below, but should be used a guide only. As data may vary between manufacturers, you should consult your supplier for more exact figures.

Physical Properties

Density: 2.7 g/cm3

Melting Point: Approx 580°C

Modulus of Elasticity: 70-80 GPa

Poissons Ratio: 0.33

Mechanical Properties

Temper

Ultimate Tensile Strength (MPa)

0.2% Proof Stress (MPa)

Brinell Hardness (500kg load, 10mm ball)

Elongation 50mm dia (%)

0

110-152

65-110

30-33

14-16

T1

180

95-96

 

16

T4

179 min

110 min

 

 

T6

260-310

240-276

95-97

9-13

Thermal Properties

Co-Efficient of Thermal Expansion (20-100°C): 23.5x10-6 m/m.°C

Thermal Conductivity: 173 W/m.K

Electrical Properties

Electrical Resistivity: 3.7 – 4.0 x10-6 Ω.cm

Typical Heat Treatment/Temper States

Treatment

Definition

F

As fabricated

0

Annealed to obtain lower strength temper

T1

Cooled from an elevated shaping process and naturally aged1

T4, T4511

Solution heat treated and naturally aged2,3

T51

Cooled from an elevated shaping process and artificially aged

T6, T6511

Solution heat treated and artificially aged2,3

Note:

1. This designation applies to products which are not cold worked after cooling from an elevated temperature shaping process, or in which the effect of cold work in flattening or straightening has no effect on mechanical properties

2. This designation applies to products which are not cold worked after solution heat-treated, or in which the effect of cold work in flattening or straightening has no effect on mechanical properties

3. This designation applies to products which are not cold worked after solution heat-treatment, or in which the effect of cold work in flattening or straightening does not effect mechanical properties.

Typically Available Forms

Being and extruded grade of aluminium, alloy 6061 is typically available as:

         Tube

         Bar

         Pipe

         Rod

Although many manufacturers offer a range of other standard extruded profiles.

Applications

Typical applications for aluminium alloy 6061 include:

         Aircraft and aerospace components

         Marine fittings

         Transport

         Bicycle frames

         Camera lenses

         Driveshafts

         Electrical fittings and connectors

         Brake components

         Valves

         Couplings

 

Source: AZoM.com

 

Date Added: Mar 24, 2006 | Updated: Jun 11, 2013
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