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Thermal and structural analysis of the crystallization dynamics of metallic glass - Fe40Ni38B18Mo4

H. THOMAS1,2,* , V. THOMAS2, R. V. RAMANUJAN3, M. R. ANANTHARAMAN1

Affiliation

  1. Department of Physics, Cochin University of Science & Technology, Cochin 682 022, Kerala, India
  2. Department of Physics, Christian College, Chengannur 689 122, Kerala, India
  3. School of Materials Engineering, Nanyang Technological University, Singapore 639 798

Abstract

Structural and crystallization kinetic studies of Fe40Ni38B18Mo4 alloy ribbons under non-isothermal conditions are reported. The present analyses have been focused on the peaks of the Differential Scanning Calorimetriy (DSC) curves and a detailed understanding about the kinetics of crystallization of the alloy. The activation energy of crystallization of 3.49 ± 0.22 eV/atom and 4.51 ± 0.21eV/atom and Avrami exponents of 1.22 and 1.39 were obtained for the primary and secondary crystallization steps. The alloy has a characteristic glass transition temperature of 648 K and super cooled liquid region spanning around 47 K. These values are correlated to the kinetics of phase transformations and microstructural modifications in the alloy with annealing. The structural evolution associated with temperature is also discussed..

Keywords

Metallic Glasses A, Crystal Growth B, Enthalpy C, Kinetics C, Thermodynamic Properties C.

Submitted at: May 29, 2009
Accepted at: Aug. 7, 2009

Citation

H. THOMAS, V. THOMAS, R. V. RAMANUJAN, M. R. ANANTHARAMAN, Thermal and structural analysis of the crystallization dynamics of metallic glass - Fe40Ni38B18Mo4, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 8, pp. 1094-1099 (2009)