Aging or precipitation hardening heat treatments apply to many metal alloys and provide an
increase in strength and hardness.
Once the alloy is solution treated at high temperature and cooled fast enough to suppress the
formation of precipitates from the solid solution, we are able to control the reaction by further
Iron and Nickel based alloys are generally precipitation hardened in the range of 900 to 1300
deg F . Details of the temperature and holding time are dependent on the specific alloy and
desired final properties.
Aluminum alloys require lower temperatures for both solution treatment and age hardening.
Some alloys will age at room temperature. These alloys are called “naturally” aged.
Others require higher temperatures to promote diffusion and form their strengthening
precipitates. These alloys are referred to as “artificially “ aged.