T6 heat treatment consists of solution taking, quenching and artificial aging steps. The solution step is a process that aims to increase the solid state solubility of the alloy elements in question by heating the alloy to a temperature above the solidus temperature, where the solubility of elements such as Cu and Mg, which positively affects the mechanical properties of the alloy, is high, and by waiting for a while at this temperature. With the quenching process step after the solution taking step, the alloy is cooled suddenly and the precipitation of the dissolved elements is prevented, and a supersaturated structure is obtained at low temperature.

The aging process step, which is the last step of the T6 heat treatment, ensures that the elements that increase the strength increase the strength by forming stable precipitates in the structure. While this process is called artificial aging because it is carried out at a certain temperature in a furnace in the T6 heat treatment, this process can be carried out at room temperature for other heat treatments. In this case, the process is called natural aging.