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Liquid to solid phase transformation: [1] The solidification process starts with the formation of the nucleus (first solid) in the existing liquid phase. This process is known as nucleation. Simultaneously, similar nucleation events happen at multiple locations within the liquid phase. [2] The nucleus gradually increases in size with time. This process is known as growth. [3] When these nuclei grow sufficiently in size, they impinge on one another resulting in multiple grains with grain boundari