Abnormal grain growth

![Abnormal grain growth observed in Rutile TiO2, induced by the presence of a zircon secondary phase.[4]](/uploads/202412/19/Abnormal_Grain_Growth_in_Rutile4638.png)
Abnormal or discontinuous grain growth, also referred to as exaggerated or secondary recrystallisation grain growth, is a grain growth phenomenon through which certain energetically favorable grains (crystallites) grow rapidly in a matrix of finer grains resulting in a bimodal grain size distribution.