Influence
of Ni content on Fe–Nb–B alloy formation |
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Authors: | J Bonastre L Escoda A González J Saurina J J Suñol |
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Institution: | (1) EPS, Campus Montilivi s/n., University of Girona, Girona, Spain, 17071 |
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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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Keywords: | Fe– Nb– B alloys mechanical alloying nanocrystalline materials |
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