Linked from
The 9 pages that link to Grain growth, each with the reason it gives.
Polycrystalline materialRelated: It changes the grain structure during heating and processing.
CrystalliteRelated: It changes crystallite dimensions during heating and processing.
RecrystallizationRelated: It can follow recrystallization when larger grains consume smaller ones.
Heat treatingRelated: Excessive heating can enlarge grains and reduce toughness.
MisorientationRelated: Misorientation can affect boundary mobility and thus grain-growth behavior.