| The phase transformation and hardness change by annealing treatment were examined for Fe_(73)Cr_(10)Mo_5B_(10)C₂ metallic glass produced by melt spinning, and were compared with those of the rapidly solidified crystalline alloy of the same composition. On annealing, this metallic glass transformed into a microcrystalline structure consisting of fine α-Fe crystals and fine boride phases. After annealing at 850℃ for 30 min. the transformed structure became very stable and the structure remained unchanged with further annealing. In this state, samples could be 180˚-bend deformed. In the case of rapidly solidified alloy of the same composition, larger grains and larger precipitates compared to the metallic glass were formed, and they formed a network in grain boundaries. Hardness changes by annealing matched well with the microstructural changes. |
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