Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 119, Issue 2, Pages 1353-1361Publisher
SPRINGER
DOI: 10.1007/s10973-014-4231-3
Keywords
Metallic glasses; Crystallization Kinetics; Local avrami exponent; Local activation energy; Co69Fe3Si18B10 alloy
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The non-isothermal crystallization kinetics of amorphous Co69Fe3Si18B10 metallic glass has been studied using various thermal analytical models. The DSC curve of amorphous sample in a constant heating rate experiment showed the appearance of two crystallization events at peak temperatures 761 and 803 K, respectively. The activation energy for the secondary crystallization process was found to be lower compared to that of primary process which indicated the ease of secondary crystallization process from modified matrix due to the evolution of the primary phase. The activation energy remained constant during the primary crystallization process over the range of crystallization fraction (0.1-0.9), however, the local Avrami exponent for this crystallization process manifested complex variation with crystallized volume fraction. The validity of the JMA model for the primary crystallization process has been studied. This crystallization process was found to show autocatalytic behavior which has been given a mathematical description using a two-parameter model of Sestak-Berggren.
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