Structural Stability of Amorphous Metals
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概要
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Effects of annealing and plastic deformation on structure of several amorphous metals (Pd-Si, Fe-Si-B, Ni-Si-B, Co-Si-B, etc.) were examined by using dark-field electron microscopy, x-ray and electron diffraction, hardness, specific gravity and electrical resistivity. In T-T-T diagrams, distinct differences in transformation sequence were observed beyond and below the critical temperature. Above this temperature, crystallization proceeds through two metastable phases and finally to the stable phase by nucleation and growth mechanisms. Below the temperature, however, progressive aging gradually changes the structure through two stages ; the first stage is due to release of internal strain in the rapidly quenched specimens and the second stage due to transformation from amorphous to single phase with the same structure as the major element. Plastic deformation at room temperature produces a much more disordered atomic structure than is present in the as-quenched state perhaps by introducing additional irregularities.
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