Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 88: Issue 1
Influence of Ni content on Fe–Nb–B alloy formation
Authors:
J. Bonastre University of Girona EPS, Campus Montilivi s/n. Girona Spain 17071

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L. Escoda University of Girona EPS, Campus Montilivi s/n. Girona Spain 17071

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A. González University of Girona EPS, Campus Montilivi s/n. Girona Spain 17071

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J. Saurina University of Girona EPS, Campus Montilivi s/n. Girona Spain 17071

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J. Suñol University of Girona EPS, Campus Montilivi s/n. Girona Spain 17071

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Pages:
83–86
Online Publication Date:
08 Apr 2007
Publication Date:
01 Apr 2007
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-006-8092-2
Keywords:
Fe–Nb–B alloys; mechanical alloying; nanocrystalline materials
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Abstract  

In this work three alloys, Fe74Nb6B20, Fe64Ni10Nb6B20 and Fe54Ni20Nb6B20, were obtained by mechanical alloying to analyze the influence of Ni content on Fe–Nb–B alloy formation. Structural analysis by X-ray diffraction (XRD) confirms that partial substitution of Fe by Ni favours the formation during milling of a more disordered structure. Furthermore, thermal stability study was performed by differential scanning calorimetry (DSC) because thermally induced structural changes can affect soft magnetic behaviour. After 40 h of milling time, all DSC curves show several exothermic effects on heating associated to structural relaxation and crystallization. All alloys present a crystallization process with associated activation energy values ranged between 238 and 265 kJ mol–1 related to the crystalline growth of the bcc-Fe rich phase. In alloys with Ni, a second crystallization process appears at temperatures over 500°C with activation energies 397 (10% Ni alloy) and 385 kJ mol–1 (20% Ni alloy) probably associated to the nucleation and crystalline growth of a new phase.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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