Nucleation of Crystals in Amorphous Materials
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Electron microscope studies have been carried out on the nucleation process of crystals in amorphous materials with the following results: (a) The nucleus size, about φ3 nm, coincides with the critical size of crystals for amorphization in a Ni-50 at%Ti alloy. (b) The primary crystals in amorphous Al<SUB>2</SUB>O<SUB>3</SUB>–ZrO<SUB>2</SUB> systems are always ZrO<SUB>2</SUB> ones, and their nucleus size, about φ5 nm, is not sensitive to both annealing temperature and chemical composition. (c) Crystallization temperature takes the maximum value at the eutectic composition in Am–Al<SUB>2</SUB>O<SUB>3</SUB>–ZrO<SUB>2</SUB> systems.<BR>The results are discussed in terms of embedded atom clusters.
- MATERIALS TRANSACTIONS
MATERIALS TRANSACTIONS 37(7), 1350-1355, 1996-07
The Japan Institute of Metals