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 ceramics and minerals.
Read more about Grain Growth: Importance of Grain Growth, Rules of Grain Growth, Driving Force, Ideal Grain Growth, Normal Vs Abnormal, Factors Hindering Growth
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