Definition of Precipitation Hardening

What is Precipitation Hardening?
It is a strengthening Process. it is Heat Treatment Process.
"Changes in solid solubility with temperature to produce fine particles of an impurity phase will increase the strength."

now, lets find out the process detailly........
This heat treatment process involves the changes in solid solubility with respect to temperature to produce fine particles of an impurity phase. This condition will obstruct the dislocation and the crystalline lattice and thus, increase the strength of the material. This heat treatment involves precipitation of impurity particles to have a strengthen material. These impurity particles are considered as second phase particles. The presence of these precipitates of second phase particles will cause lattice distortion because of the different is size comparable to the host particles. This distortion will then impede the dislocation which leads to the hardening of materials.