Precipitation hardening is a type of strengthening process for metals or alloys by adding certain elements and subjecting them to heat treatment. There are several other terms used to describe precipitation hardening, including age hardening, precipitation strengthening, and solution and aging heat treatment. These processes typically involve the formation of fine, uniform particles within the metal structure that increase its strength and hardness. Precipitation hardening can be performed on a wide range of metals, including aluminum, magnesium, and titanium alloys. This process is commonly used in manufacturing industries for producing strong and durable components for aerospace, automotive, and military applications.