Why is any abnormal grain growth not observed in coarse grained polycrystalline materials?

Why is any abnormal grain growth not observed in coarse grained polycrystalline materials? Correct Answer Enhanced grain boundary enthalpy

Abnormal grain growth is not observed in coarse-grained poly-crystalline materials. This is due to the enhanced grain boundary enthalpy that leads to high driving force. Also the non-equilibrium grain boundary structure in the nanocrystalline state is responsible for no abnormal grain growth.
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