Age hardening is a process widely used in materials science to increase the mechanical strength and toughness of a metal alloy. The process involves heating the metal to a specific temperature (known as the aging temperature) followed by a rapid cooling. This induces a reaction in the alloy that leads to a strengthening of the material. Some synonyms for age hardening include precipitation hardening, solid solution strengthening, and phase hardening. These terms refer to the same process that enhances the mechanical properties of metals and alloys. Age hardening is a crucial process in the manufacturing of aircraft components, automotive parts, and mechanical systems that require high strength and durability.