Phase transitions in mechanically comminuted Fe78B13Si9 amorphous ribbon

摘要: Abstract Characterization of mechanically comminuted Fe 78 B 13 Si 9 amorphous ribbon was performed by means differential scanning calorimetry and X-ray diffraction. The structure remained unaltered on comminution in cases where powders were produced brittle fracture modes. When heavily deformed plastically during comminution, the partially crystallized into 3 α-Fe. large amount phase observed suggests that formation is strain induced. On heating these powders, an endothermic reaction took place at temperatures immediately above temperature range which two exothermic reactions associated with crystallization α-Fe occurred. subsequent cooling, occurred as a reverse endothermic. This pair indicates occurrence reversible first-order transition, attributed to stress-induced thermoelastic martensitic transition B. magnitude thermal effect decreased when cycle repeated owing relaxation elastic stress fields formed comminution.