Topics Covered
Background
Chemical Composition of Aluminium Alloy
2011
Properties of Aluminium Alloy
2011
Mechanical Properties of
Aluminium Alloy 2011
Physical
Properties of Aluminium Alloy 2011
Alloy
Designations
Fabrication of
Aluminium Alloy 2011
Welding
Fabrication Response
Temper
Applications
of Aluminium Alloy 2011
Supplied Forms
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 Aluminium alloy 2011 can replace free machining brass without
the need for alterations to tooling.
It has poor corrosion resistance, which means parts made from Aluminium alloy
2011 tend to be anodised to provide additional surface protection.
Chemical Composition of Aluminium Alloy 2011
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 of Aluminium Alloy 2011
Mechanical Properties of Aluminium
Alloy 2011
Table 2. Typical mechanical properties for aluminium
alloy 2011
|
Temper |
T3 |
T6 |
|
Proof Stress 0.2% (MPa) |
290-300 |
300 |
|
Tensile Strength (MPa) |
365 |
395 |
|
Shear Strength (MPa) |
220 |
235 |
|
Elongation A5 (%) |
15 |
12 |
|
Hardness Vickers (HV) |
110 |
115 |
Physical Properties of Aluminium Alloy 2011
Table 3. Typical physical properties for aluminium alloy
2011
|
Property |
Value |
|
Density |
2.82 kg/m3 |
|
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
of Aluminium Alloy 2011
Welding
Aluminium
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 2011 aluminium
are:
- T3 – Solution heat treated, cold worked and naturally aged
- T6 – Solution heat treated and artificially aged
Applications of Aluminium Alloy 2011
Aluminium
alloy 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
Aluminium
alloy 2011 is typically supplied as either round or hexagonal bar
Source: Aalco
For more information on this source please visit Aalco