The solubilities of these elements increase markedly with temperature, especially just below the eutectic melting temperature. The purpose of the solution heat treatment is to obtain the maximum practical solid solution concentration of the hardening solutes such as copper, magnesium, silicon, or zinc. Figure 1: General sequence for heat-treating aluminum alloys. The temper designations will be discussed in a later article on aging. The temper designation describes fully the process sequence. The general sequence of heat-treating aluminum is shown in Figure 1.
In the heat-treatable alloy systems such as 7XXX, 6XXX, and 2XXX, the alloying elements show greater solubility at elevated temperatures than at room temperature. Heat Treating Aluminum AlloysĪluminum alloys are classified as either heat-treatable or not heat-treatable, depending on whether the alloy responds to precipitation hardening. In subsequent articles, I’ll discuss the other unit processes of aluminum heat treating. In this article, I will be discussing the solution heat treatment of aluminum. I n my article last month, I discussed the alloying elements used in aluminum alloys.
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