With a topological criterion a parameter free structural analysis is conducted.
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Crystallization includes three stages: homogenous nucleation, rapid and slow growth.
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Bcc structures act as intermediate state between liquid and fcc and hcp crystals.
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The stacking of fcc, hcp and bcc atoms in the nuclei undergo complex adjustment.
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Hcp atoms mainly locate between the dominate fcc grains in the final solid.
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