2024

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Description

Aluminium / Aluminum alloys have strong corrosion resistance characteristics. These alloys are sensitive to high temperatures ranging between 200 and 250°C (392 and 482°F). An increase in strength takes place when these alloys are exposed at subzero temperatures and strength is lost when these alloys are exposed to high temperatures. Aluminium / Aluminum alloys are good low-temperature alloys.

Annealing

Aluminium / Aluminum 2024 alloy is annealed from a heat treated condition between 399 and 427°C (750 and 800°F) for about 2 hours and then cooled slowly in the furnace. This alloy can be annealed between cold working operations at 343°C (650°F) for 2 hours after which the alloy is cooled in air.

Cold Working

Conventional methods are used for cold working Aluminium / Aluminum 2024 alloy. For a sheet that is 1/4″ thick, or thinner bend radii of 1/2 to 1 times thickness are suitable. Ductility in the annealed condition is best suited for this alloy. Bend radii of five to six times thickness are suitable for T3 or T4 conditions.

Welding

Inert gas consumable electrode arc method or resistance welding is used to weld Aluminium / Aluminum 2024 alloy. In general, welding of any kind is not recommended for Aluminium / Aluminum 2024 alloy due to degradation of corrosion resistance that occurs as a result of weld heat. If this alloy is welded then the heat treatment should be repeated.

Forging

Aluminium / Aluminum 2024 alloy can be forged, but a reasonable corrosion resistance should be retained by a subsequent heat treatment.

Forming

Conventional methods are used to form Aluminium / Aluminum 2024 alloy. Hot forming is not recommended for this alloy.

Machinability

Aluminium / Aluminum 2024 alloy has good machining characteristics in the heat treated condition. This alloy also has good machining characteristics in the annealed condition. Oil lubricants should be used in the machining process.

Heat Treatment

Aluminium / Aluminum 2024 alloy is an age-hardening and is strengthened during the heat treatment process. The T6 condition is obtained when the alloy is heated at 493°C (920°F) and then quenched for 10 h at 190°C (375°F) and finally cooled in air. The T4 condition is obtained when this alloy is heated at 493°C (920°F) followed by cold water quenching and finally aging at room temperature.

Hot Working

Hot forming is not fully recommended for Aluminium / Aluminum 2024 alloy due to the harmful effect caused by heating upon corrosion resistance.

Hardening

Aluminium / Aluminum 2024 alloy is hardened by a solution anneal and aging method at room temperature or by cold working.