What are the characteristics of wrought aluminum alloys that cannot be heat-treated to strengthen aluminum alloys? Which expert can tell me about it?

Generally, cast aluminum alloy can be heat-treated, but according to different processes, some products of cast aluminum alloy are not heat-treated, such as die-casting aluminum alloy.

Deformed aluminum alloys can be divided into: high-purity aluminum, industrial pure aluminum, rust-proof aluminum, hard aluminum, forged aluminum and superhard aluminum. The first three can not be strengthened by heat treatment, and can only be used in the state of annealing or cold working hardening. The latter three can be strengthened by quenching and aging treatment.