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 Content (%)
Aluminium / Aluminum, Al 93.7
Copper, Cu 2.30
Magnesium, Mg 1.60
Iron, Fe 1.1
Nickel, Ni 1.0
Silicon, Si 0.18
Titanium, Ti 0.07

Physical Properties

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

Properties Metric Imperial
Density 2.6-2.8 g/cm3 0.0939- 0.101 lb/in3
Melting point 510°C 950°F

Mechanical Properties

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

Properties Metric Imperial
Tensile strength 440 MPa 63817 psi
Yield strength 370 MPa 53664 psi
Shear strength 260 MPa 37709 psi
Fatigue strength 125 MPa 18130 psi
Elastic modulus 70-80 GPa 10153-11603 ksi
Poisson's ratio 0.33 0.33
Elongation 10% 10%

Thermal Properties

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

Properties Metric Imperial
Thermal conductivity (@25°C/77°F) with T61 treatment
146 W/mK 1013 BTU in/hr.ft².°F

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.

Date Added: Aug 30, 2012 | Updated: Jun 11, 2013
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