Editorial Feature

Aluminium / Aluminum 2618 Alloy (UNS A92618)

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
    Hardening
Applications

Introduction

Aluminium / Aluminum alloys have high ductility and corrosion resistance. At subzero temperatures, their strength can be increased. However, their strength can be reduced at high temperatures of about 200-250°C. Aluminium / Aluminum 2618 alloy is an age hardenable alloy containing magnesium and copper.

The datasheet given below gives details about Aluminium / Aluminum 2618 alloy.

Chemical Composition

The following table shows the chemical composition of Aluminium / Aluminum 2618 alloy.

 

Element

Composition

Copper

1.9 - 2.7

Silicon

0.25

Iron

0.9 - 1.3

Magnesium

1.3 -1.8

Titanium

0.04 - 0.1

Nickel

0.9 - 1.2

Others

0.05

Aluminum

92 - 94

 

Physical Properties

The physical properties of the Aluminium / Aluminum 2618 alloy are tabulated below.

Property

Metric

Imperial

Density

2.76 g/cc

0.0997 lb/in^3

Melting Point

549 - 638 °C

1020 - 1180 °F

 

Mechanical Properties

The mechanical properties of the Aluminium / Aluminum 2618 alloy are outlined in the following table.

Properties

Metric

Tensile

 

Tensile Strength

372 MPa

54000 psi

 

Tensile Strength, Ultimate 

441 Mpa

64000 psi

 

Shear Strength

262 Mpa

38000 psi

 

Fatigue Strength (completely reversed stress; RR Moore machine/specimen)

124 Mpa

18000 psi

 
 
 

Elastic Modulus (AA; Typical; Average of tension and compression)

74.5 Gpa

10800 ksi

 
 

Poisson's ratio

0.33

0.33

 

Elongation at Break

10% at -28.0 °C

10% -18.4 °F

 

14% at 149 °C

14% at 300 °F

 

50% at 260 °C

50% at 500 °F

 
 

Thermal Properties

The thermal properties of the Aluminium / Aluminum 2618 alloy are given in the following table.

Thermal Properties

Metric

Imperial

Thermal Conductivity

146 W/m-K

1010 BTU-in/hr-ft²-°F

Specific Heat Capacity

0.875 J/g-°C

0.209 BTU/lb-°F

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Other Designations

Other designations equivalent to the Aluminium / Aluminum 2618 alloy include DIN 3.1924.

Fabrication and Heat Treatment

Machinability

Aluminium / Aluminum 2618 alloy has good machining characteristics. It can be smoothly machined in heat treated conditions.

Forming

Aluminium / Aluminum 2618 alloy has good hot and cold formability.

Welding

Aluminium / Aluminum 2618 alloy can be welded using resistance welding techniques. It is not welded using conventional fusion welding methods because the heat produced by these methods can be harmful to this alloy.

Heat Treatment

Aluminium / Aluminum 2618 alloy can be heat treated at 530°C (985°F) for a sufficient period of time followed by quenching in water.

Forging

Aluminium / Aluminum 2618 alloy is forged at 372 to 522°C (700 to 970°F).

Hot Working

Aluminium / Aluminum 2618 alloy is hot worked at 350 to 372°C (660 to 700°F).

Cold working

Aluminium / Aluminum 2618 alloy can be cold worked in the heat treated or annealed conditions.

Annealing

Annealing of Aluminium / Aluminum 2618 alloy can be performed at 385°C (725°F) for 4 h. It can be then slowly cooled in the furnace.

Aging

Aluminium / Aluminum 2618 alloy can be aged at 527°C (980°F) for 24 h followed by quenching in boiling water. Aging process can be again repeated at 199°C (390°F) for 20 h followed by cooling in air.

Hardening

Aluminium / Aluminum 2618 alloy can be hardened by cold working and aging.

Applications

Aluminium / Aluminum 2618 alloy is mainly used in manufacturing aircraft engines.

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