Aluminium / Aluminum 2124 Alloy (UNS A92124)

Topics Covered

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

Introduction

Aluminium / Aluminum alloys feature strong corrosion resistance characteristics. These alloys are defined as good low-temperature alloys with high electrical conductivity. Aluminium / Aluminum alloys gain strength when exposed to subzero temperatures and lose strength when these alloys are exposed to high temperatures. Aluminium / Aluminum alloys are sensitive to high temperatures ranging between 200 and 250°C (392 and 482°F).

The following datasheet provides an overview of Aluminium / Aluminum 2124 alloy.

Chemical Composition

The chemical composition of Aluminium / Aluminum 2124 alloy is outlined in the following table.

Element Content (%)
Aluminium / Aluminum, Al 93.50
Copper, Cu 4.4
Magnesium, Mg 1.5
Manganese, Mn 0.6

Physical Properties

The following table shows the physical properties of Aluminium / Aluminum 2124 alloy.

Properties Metric Imperial
Density 2.6-2.8 g/cm3 0.0939-0.1011 lb/in3
Melting point 510°C 950°F

Mechanical Properties

The mechanical properties of Aluminium / Aluminum 2124 alloy are displayed in the following table.

Properties Metric Imperial
Elastic modulus 70-80 GPa 10152-11603 ksi
Poisson's ratio 0.33 0.33

Thermal Properties

The thermal properties of Aluminium / Aluminum 2124 alloy are given in the following table.

Properties Conditions
T (ºC) Treatment
Thermal conductivity 191 (W/mK) 25 O

Other Designations

Equivalent materials to Aluminium / Aluminum 2124 alloy are:

  • AMS 4221
  • ASTM B209
  • QQ A-250/29
  • QQ A250/9

Fabrication and Heat Treatment

Annealing

Aluminium / Aluminum 2124 alloy is annealed at 413°C (775°F) for 2 to 3 hours. The alloys is then cooled at 10°C (50°F) per hour to 260°C (500°F) and finally cooled in air.

Cold Working

Aluminium / Aluminum 2124 alloy is cold worked to a limited extent in comparison to other Aluminium / Aluminum alloys.

Welding

Resistance welding is recommended for Aluminium / Aluminum 2124 alloy. Arc welding and gas welding are not recommended for this alloy.

Forging

Aluminium / Aluminum 2124 alloy can be forged.

Forming

Aluminium / Aluminum 2124 alloy can be formed in a limited manner and severe cold working is not recommended for this alloy.

Machinability

Conventional methods are used for the machining process of Aluminium / Aluminum 2124 alloy.

Heat Treatment

Aluminium / Aluminum 2124 alloy can be solution annealed at 493°C (920°F) and then water quenched. The T 851 temper is produced when precipitation hardening is performed for 12 hours at 190°C (375°F) that is followed by air cooling.

Hot Working

Hot working for Aluminium / Aluminum 2124 alloy is not recommended as this alloy has the tendency to crack due to heat input.

Hardening

Aluminium / Aluminum 2124 alloy is hardened by the precipitation hardening method for 12 hours at 190°C (375°F) and then cooled in air.

Aging

Aging for Aluminium / Aluminum 2124 alloy is done at 190°C (375°F) for about 12 hours and the alloy is then cooled in air.

Applications

Aluminium / Aluminum 2124 alloy is used in aircraft structures amongst other things.

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