nano-devitrification and structural evolution of rapidly solidified amorphous al-tm (cu-co)-y (at.%) alloy

Activation energies and other kinetic parameters of primary crystallization of al86cu6co2y6 (at.%) amorphous alloy describing the mechanism was determined. melt spinning on a child copper wheel was used to prepare the al86cu6co2y6 (at. %) amorphous ribbons. the ribbons at as-spun and annealed conditions were studied by optical microscopy (om), differential scanning calorimetry (dsc), x-ray diffraction and field emission scanning electron microscopy (fesem). the kinetic parameters of the crystallization process were determined by kissinger and moynihan methods at non-isothermal condition. crystallization mechanism was studied using the johnson–mehl–avrami equation. according to the average value of avrami exponent (2.065±0.16), the primary crystallization process is conducted by 3d diffusional growth with decreasing rate. the α-al nanoparticles below 50 nm in size distributed evenly in the glassy matrix and intermetallic phases (al3y, alcu3 and al11y3) were formed during the first and second stages of crystallization, respectively.