Aluminium / Aluminum 6061 Alloy (UNS A96061)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Heat Treatment
     Forging
     Hot Working
     Cold Working
     Annealing
     Aging
Applications

Introduction

Aluminium / Aluminum alloys are sensitive to high temperatures. They tend to lose some of their strength when exposed to high temperatures of about 200-250°C. However, their strength can be increased at subzero temperatures. They also have good corrosion resistance. Aluminium / Aluminum 6061 alloy is the most commonly available and heat treatable alloy.

The following datasheet gives an overview of Aluminium / Aluminum 6061 alloy.

Chemical Composition

The following table shows the chemical composition of Aluminium / Aluminum 6061 alloy.

Element Content (%)
Aluminium / Aluminum, Al 97.9
Magnesium, Mg 1
Silicon, Si 0.60
Copper, Cu 0.28
Chromium, Cr 0.20

Physical Properties

The physical properties of Aluminium / Aluminum 6061 alloy are outlined in the following table.

Properties Metric Imperial
Density 2.7 g/cm3 0.0975 lb/in3
Melting point 588°C 1090°F

Mechanical Properties

The mechanical properties of Aluminium / Aluminum 6061 alloy are tabulated below.

Properties Metric Imperial
Tensile strength 115 MPa 16680 psi
Yield strength 48 MPa 6962 psi
Shear strength 83 MPa 12038 psi
Fatigue strength 62 MPa 8992 psi
Elastic modulus 70-80 GPa 10153-11603 ksi
Poisson's ratio 0.33 0.33
Elongation 25% 25%
Hardness 30 30

Thermal Properties

The thermal properties of Aluminium / Aluminum 6061 alloy are given in the following table.

Properties Conditions
T (ºC) Treatment
Thermal expansion co-efficient 23.4 (10-6/ºC) 20-100 -
Thermal conductivity 180 W/mK 25 -

Other Designations

Other designations that are equivalent to the Aluminium / Aluminum 6061 alloy are listed in the following table.

AMS 4117 ASTM B247 ASTM B429 DIN 3.3211 MIL G-18014 QQ A-200/8
ASTM B209 ASTM B307 ASTM B483 MIL A-12545 MIL G-18015 QQ A-225/8
ASTM B210 ASTM B313 ASTM B547 MIL A-22771 MIL P-25995 QQ A-250/11
ASTM B211 ASTM B316 ASTM B548 MIL F-17132A MIL T-7081 QQ A-367
ASTM B221 ASTM B345 ASTM B632 MIL F-18280 MIL W-23351 QQ A-430
ASTM B234 ASTM B361 ASTM F467 MIL F-39000 MIL W-85 QQ WW-T-700/6
ASTM B241 ASTM B404 ASTM F468 MIL F-3922 QQ A-200/16 SAE J454

Fabrication and Heat Treatment

Machinability

Aluminium / Aluminum 6061 alloy has good machinability in harder T 4 and T6 tempers. It can be machined in annealed temper.

Forming

Aluminium / Aluminum 6061 alloy can be easily formed and worked in the annealed condition. The standard methods are used to perform bending, stamping, deep drawing, and spinning operations.

Welding

Aluminium / Aluminum 6061 alloy has excellent weldability. Thinner sections can be welded using gas tungsten arc welding technique. Heavier sections can be welded using gas metal arc welding technique. Alloy 4043 filler wire can be used to achieve good result, but it will affect T 6 properties.

Heat Treatment

Aluminium / Aluminum 6061 alloy is heat treated at 533°C (990°F) for a sufficient period of time followed by quenching in water. Precipitation hardening process can be performed at 160°C (320°F) for 18 h followed by air cooling. This process is again repeated at 177°C (350°F) for 8 h followed by cooling in air.

Forging

Aluminium / Aluminum 6061 alloy is forged at 233 to 483°C (750 to 900°F).

Hot Working

Aluminium / Aluminum 6061 alloy is hot worked at 260 to 372°C (500 to 700°F).

Cold Working

Aluminium / Aluminum 6061 alloy is cold worked in the O temper condition. It can also be cold formed in the T 4 and T 6 tempers.

Annealing

Annealing of Aluminium / Aluminum 6061 alloy can be performed at 775°F for 2 to 3 h followed by controlled cooling at 10 to 260°C (50 to 500°F) per hour, and air cooling.

Aging

Aging of Aluminium / Aluminum 6061 alloy can be performed at 177°C (350°F) for 8 h. It is then cooled in air.

Applications

Aluminium / Aluminum 6061 alloy is used in the following applications:

  • Truck and marine components
  • Furniture
  • General structural and high pressure applications
  • Pipelines
  • Heavy-duty structures
  • Railroad cars
  • Tank fittings

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