Analytical description of isothermal primary crystallization kinetics of glasses: Fe85B15 amorphous alloy

• Published in: Journal of non-crystalline solids Vol. 351; no. 19-20; pp. 1658 - 1664
• Main Authors: TKATCH, V. I, RASSOLOV, S. G, MOISEEVA, T. N, POPOV, V. V
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 01.07.2005
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Growth from solid phases (including multiphase diffusion and recrystallization); Materials science; Methods of crystal growth; physics of crystal growth; Physics; Electrical conductivity; 81.07.Bc; 64.60.Qb; Crystallization; Melt spinning; Amorphous alloy; XRD; 61.43.Dq; Boron alloys; Kinetic model; Metallic glasses; Growth mechanism; Analytical method; Arrhenius equation; 81.10.Aj; Kinetics; Nanocrystal; Iron base alloys; Transition element alloys
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2005.04.057

Kinetics of isothermal primary crystallization (formation of nanoscale crystals of alpha--Fe solid solution) of amorphous Fe85B15 melt--spun ribbons and structure of partially crystallized samples have been investigated by combination of the resistivity measurements and X--ray diffraction analysis. The simple analytical model describing kinetics of primary crystallization is developed. The model is based on the approximate solution of a steady state flux balance equation accounting soft impingement of the diffusion fields of growing crystals as well as on the Kolmogorov--Johnson--Mehl--Avrami formalism. It has been shown that the model allows to correctly describe the primary crystallization behavior, in part, the experimentally observed lowering of the Avrami exponent. By matching of the calculated kinetic curves with experimental ones with using a set of experimentally determined structural parameters the Arrhenius--type temperature dependence of the diffusion coefficient which governs the diffusion--limited growth of alpha--Fe crystals has been determined. A good agreement of such obtained values of diffusivity with the relevant experimental data implies the validity of the model for analysis of nanocrystallization kinetics in metallic glasses.