Study of the dynamic of crystallization of an amorphous Fe40Ni40P14B6 ribbon through Johnson-Mehl-Avrami model

Autor(es)

Peixoto, E. B. ^[1] ; Mendonca, E. C. ^[1] ; Mercena, S. G. ^[1] ; Jesus, A. C. B. ^[1] ; Barbosa, C. C. S. ^[1] ; Meneses, C. T. ^[1] ; Duque, J. G. S. ^[1] ; Silva, R. A. G. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sergipe, Programa Posgrad Fis, Campus Prof Jose Aluisio de Campos, BR-49100000 Sao Cristovao, SE - Brazil

^[2] UNIFESP, Dept Quim, Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 731, p. 1275-1279, JAN 15 2018.
• Citações Web of Science: 3

Resumo

The study of the crystallization process of an amorphous Fe40Ni40P14B6 ribbon which is grown by the melt-spinning is reported. Differential scanning calorimetry (DSC), thermogravimetry (TGA), X-ray diffraction and magnetization measurements are used to investigate its dynamic of crystallization. DSC measurements show that a well-pronounced exothermic peak corresponding to first crystallization changes as function of the heating rate. For using the temperature calibration procedure of the thermogravimetric equipment, we are able to observe both the transition magnetic temperature of amorphous phase and the crystallization step observed in the differential scanning calorimetry measurements. The analysis of the dynamic of crystallization through Johnson-Mehl-Avrami (JMA) model allows us to state that the nucleation and grain growth processes occur by diffusion controlled growth. The analysis of the X-ray diffraction ex situ carried out after heating confirm the appearing of nanocrystalline Fe3B0.63P0.37 and Ni3P grains (of approximate to 40 nm) which are likely embedded inside a residual amorphous matrix. Finally, the increasing the crystallized fraction takes an important role on saturation magnetization and magnetic anisotropy. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 15/18996-0 - Estudo dos efeitos das adições de Gd e Mn sobre as propriedades térmicas, magnéticas e mecânicas da liga Cu-9%Al
• Beneficiário: Ricardo Alexandre Galdino da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular