Solution heat treatment is a common heat treatment process for many different metal families. Stainless steels, aluminum alloys, nickel-based super alloys, titanium alloys and some copper-based alloys may require solution heat treatment.
The solution process is heating an alloy to a suitable temperature, keeping one or more components at that temperature enough to cause it to go into a solid solution, and then cool it quickly enough to keep those components in solution.
Aging is required in order to increase the hardness after cooling. In this way, the strength of the material is increased by precipitation.