In this study, occurrence of different phase transformations was investigated in a FeCo-7wt% V alloy upon heating to 1200°C by the dilatometry method at different heating rates (5, 10, and 15 ?C min -1 ). It was found that four phase transformations (including B2 -type atomic ordering in ? phase, first stage of polymorphic transformation (? ? ? r + ?), ordering to disordering, and second stage of polymorphic transformation (? r ? ?) occur in this alloy up to 1200°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(?) ) were calculated by the invariant kinetic parameters (IKP) method and fitting model. Also, the influence of annealing treatment on macro and micro-texture of cold-rolled FeCo-7.15V ferromagnetic ultra-thin foils were studied. The present study investigates the microstructure and grain boundaries evolutions during recrystallization of commercial FeCo-~7wt. % V. The resulting microstructures were characterized using electron back scatter diffraction after annealing at different temperatures. At low temperatures (~400 ?C), where only recovery occurs during annealing, the fraction of low angle boundaries was increased. But, at high temperatures (~850 ?C), where recrystallization occurs during annealing, the fraction of high angle boundaries and low-? coincidence site lattice (CSL) boundaries (especially ?3) were increased. Also, the effect of nano/sub-micron crystallization on the magnetic properties of Fe-Co-7.15V alloy was investigated. Hence, cold-rolled Fe-Co-7.15V alloy (with 90% reduction) was annealed in different conditions. The magnetic properties of the annealed samples were measured by vibrating sample magnetometer. It was found that the best magnetic properties of the cold-rolled alloy were obtained after annealing at 550 °C for 2 hr
