1) Materials science 
Grain growth is the increase in size of grains (crystallites) in a material at high temperature. This occurs when recovery and recrystallisation are complete and further reduction in the internal energy can only be achieved by reducing the total area of grain boundary. The term is commonly used in metallurgy but is also used in reference to cerami...
An increase in metallic crystal size as annealing temperature is raised; growth occurs by invasion of crystal areas by other crystals.An increase in the average size of the grains in polycrystalline metal or alloy, usually a result of heating at elevated temperature.
An increase in the average size of the grains in polycrystalline metal or alloy, usually a result of heating at elevated temperature.