Thermally induced crystallization of amorphous Fe40Ni40P14B6 alloy

0449814 - ÚFM 2016 RIV NL eng J - Journal Article
Vasić, M. - Blagojević, V. A. - Begović, N. N. - Žák, Tomáš - Pavlović, V. B. - Minić, Dragica M.
Thermally induced crystallization of amorphous Fe40Ni40P14B6 alloy.
Thermochimica Acta. Roč. 614, AUG (2015), s. 129-136. ISSN 0040-6031. E-ISSN 1872-762X
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081723
Keywords : Amorphous alloy * Crystallization * Kinetics * Deconvolution * Impingement * Surface morphology
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.938, year: 2015

The crystallization mechanism and kinetics of Fe40Ni40P14B6 amorphous alloy were studied under non-isothermal conditions. Thermal stabilization of this alloy manifests in DSC through two complex peaks, corresponding to crystallization and recrystallization, respectively. The complex crystallization DSC peak was deconvoluted into individual steps corresponding to crystallization of individual phases, where the results using both Gaussian-Lorentzian cross-product and Fraser-Suzuki function were compared. It was determined that the values of kinetic triplets of the individual steps did not exhibit any significant difference, depending on the deconvolution function. Anisotropic growth was indicated to be the prevailing type of impingement for all crystallization steps. Using the calculated values of the respective kinetic triplets and the mechanisms determined from the value of Avrami exponent, distinct values of activation energies for nucleation and crystal growth for crystallization of each individual phase were calculated, showing significantly higher values for nucleation than those for crystal growth. Alloy samples treated non-isothermally in the DSC cell exhibit inhomogeneous surface morphology with highly granulated structure dependent on heating rate.
Permanent Link: http://hdl.handle.net/11104/0251259