Non-isothermal kinetic analysis on the phase transformations of Fe-Co-V alloy

作者：Hasani S^*; Shamanian M; Shafyei A; Behjati P; Szpunar J A

来源：Thermochimica Acta, 2014, 596: 89-97.

DOI：10.1016/j.tca.2014.09.020

• Fe-Co-V alloy
• Thermal analysis
• Non-isothermal kinetics
• Dilatometry
• Kinetic models

In this study, occurrence of different phase transformations was investigated in a FeCo-7 wt% V alloy upon heating to 1200 degrees C by the dilatometry method at different heating rates (5, 10, and 15 degrees C min(-1)). It was found that four phase transformations (including B2-type atomic ordering in alpha phase, first stage of polymorphic transformation (alpha -%26gt;alpha(r)+gamma), ordering to disordering, and second stage of polymorphic transformation (alpha(r)-%26gt;gamma) occur in this alloy up to 1200 degrees C. Two isoconversional methods, as Starink and Friedman, were used to determine variation of the activation energy with temperature, E(T). Moreover, the empirical kinetic triplets (E, A, and g(alpha)) were calculated by the invariant kinetic parameters (II(P) method and fitting model.

• 出版日期2014-11-20