Abstract
An apparent activation enthalpy analysis was performed on the endothermic peak observed in the differential scanning calorimetry (DSC) thermogram of the post-annealed Metglas ® MBF 20/20A (Ni 68.8Cr 6.6Fe 2.6B 14.1Si 7.6, at%). The position of the peak in the DSC temperature scan was dependent upon the isothermal annealing conditions. This dependence showed apparent activation enthalpies between (250 ± 10) and (260 ±10) kJ/mol for peak positions between 620 and 640 K, respectively. The shift in endothermic peak position caused by different scanning rates resulted in a range of apparent activation enthalpies: 280 ± 10 or 294 ±9 kJ/mol for peak positions between 606 and 648 K respectively. The apparent activation enthalpies derived from the isothermal annealing data have been interpreted as representative of an ordering process while those calculated by changing the DSC scanning rate describe an order to disorder transition. These two processes apparently have different activation enthalpies.
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