Aluminium alloy

Aluminium Alloys - Aluminium 2011

Background

Aluminium alloy 2011 is a high mechanical strength alloy that machines exceptionally well. Often called a Free Machining Alloy or ‘FMA’ it is well suited to use in automatic lathes.

Machining at high speeds produces fine chips that are easily removed. The excellent machining characteristics allow the production of complex and detailed parts. In some circumstances 2011 can replace free machining brass without the need for alterations to tooling.

It has poor corrosion resistance, which means parts made from 2011 tend to be anodised to provide additional surface protection.

When higher levels of corrosion resistance are required, 6262 T9 may be a suitable replacement.

Chemical Composition

Table 1. Typical chemical composition for aluminium alloy 2011

Element

% Present

Si

0.4%

Fe

0.7%

Cu

5.0-6.0%

Pb

0.2-0.6%

Bi

0.2-0.6%

Zn

0.3%

Other

0.15%

Al

Balance

Properties

Mechanical Properties

Table 2. Typical mechanical properties for aluminium alloy 2011

Temper

T3

T6

Proof Stress 0.2% (MPa)

290

300

Tensile Strength (MPa)

365

395

Shear Strength (MPa)

220

235

Elongation A5 (%)

15

12

Hardness Vickers (HV)

100

115

Physical Properties

Table 3. Typical physical properties for aluminium alloy 2011

Property

Value

Density

2.82 g/cm3

Melting Point

535°C

Modulus of Elasticity

71 GPa

Electrical Resistivity

0.045x10-6 Ω.m

Thermal Conductivity

138 W/m.K

Thermal Expansion

23x10-6 /K

Alloy Designations

Aluminium alloy 2011 also corresponds to the following standard designations and specifications:

AlCu6BiPb

FC1

A92011

CB60

3.1655

AlCuBiPb

Fabrication

Welding

Alloy 2011 has extremely poor weldability and thus welding is not recommended. However, as it is used for machined parts there is rarely a need to weld this alloy.

Fabrication Response

Table 4. Typical fabrication response for aluminium alloy 2011

Process

Rating

Workability - Cold

Fair

Machinability

Excellent

Weldability – Gas

Poor

Weldability – Arc

Poor

Weldability – Resistance

Poor

Brazability

Poor

Solderability

Fair

Temper

The most common tempers for 6082 aluminium are:

         T3 – Solution heat treated, cold worked and naturally aged

         T6 – Solution heat treated and artificially aged

Applications

2011 is typically used in applications that require parts manufactured by repetition machining.

These applications may include:

         Appliance parts & trim

         Automotive trim

         Fasteners and fittings

         Ordnance

Supplied Forms

2011 aluminium is typically supplied as either round or hexagonal bar

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