Influence of Nanocrystallization in the Electrochemical Behaviour of Fe&lt;sub&gt;(73.5-X)&lt;/sub&gt;Cu&lt;sub&gt;1&lt;/sub&gt;Nb&lt;sub&gt;3&lt;/sub&gt;Si&lt;sub&gt;13.5&lt;/sub&gt;B&lt;sub&gt;9&lt;/sub&gt;Cr&lt;sub&gt;X(0-5)&lt;/sub&gt; Finemet Type Alloy

Marzo, F.F.; Pierna, A.R.; Lorenzo, A.; Altube, A.; Sistiaga, M.; Salaverría, A.; Camacho, A. Fernández

doi:10.4028/www.scientific.net/msf.289-292.1047

Cited by 11 publications

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“…These structures can be interpreted as˛-Fe(Si) nanocrystallites surrounded by the amorphous residual matrix. 3 As the time of the annealing treatment at 600°C increases, the number and size of the nanocrystals formed increase gradually up to 15 min of treatment. At longer times the results suggest an increase in the nanocrystal size with a depletion in their amount (Figs 2(b) and 3).…”

Section: Resultsmentioning

confidence: 98%

“…These facts facilitate the passivation lowering the current density in the active-passive transition. On the basis that the preferential electrochemical dissolution of the nanocrystalline phase in the amorphous matrix is responsible for the corrosion rate of the alloy, 3 the slight increase in the nanocrystallites size for long annealing times at 600°C induces a slight increase in the active-passive peak transition. In addition, on increasing the annealing time, changes in the local surface composition could be present that would also attend to the gradual loss of the corrosion resistance.…”

Section: Corrosion Resistance Of Nanocrystalline Alloysmentioning

confidence: 99%

“…The influence of chromium additions as well as the nanocrystallization process on the electrochemical behaviour of this alloy type have been analysed recently. 2,3 The devitrification process of the Fe 73.5 -x Cu 1 Nb 3 B 9 -Si 13.5 Cr x 0 -5 alloy occurs in two stages in the ranges 533-552 and 670-695°C, respectively. In the first stage, the˛-Fe(Si) nanocrystalline phase is formed.…”

Section: Introductionmentioning

confidence: 99%

“…3 The size and morphology of the nanocrystals in these alloys, as well as their distribution, could be well analysed by the application of 'local probe techniques'. These techniques, such as scanning tunneling microscopy (STM) and atomic force microscopy (AFM), provide three-dimensional surface topographic images at nanometer level, 4 and represent powerful tools to study the surface properties and structures of metals and alloys.…”

Section: Introductionmentioning

confidence: 99%

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Nanocrystallization process of the Fe69.5Cu1Nb3B9Si13.5Cr4 FINEMET-type alloy: an AFM study

Salinas¹,

García²,

Bessone³

et al. 2000

Surf. Interface Anal.

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The different devitrification stages of Fe 69.5 Cu 1 Nb 3 B 9 Si 13.5 Cr 4 (F-Cr4) amorphous alloy were studied by atomic force microscopy (AFM) on samples annealed at 400, 600 and 670°C for different treatment times. The AFM images showed no topographic changes in the alloys treated at 400°C, indicating that only structural relaxations took place at this annealing temperature. Samples thermally treated at 600°C showed hemispherical features uniformly distributed on the surface, suggesting initiation of the nanocrystallization process. The nanocrystals formed had a size distribution of 15-40 nm, which is slightly affected by the annealing time. At 670°C the crystallization phenomena occurred with the formation of large crystals and an increase in roughness. The corrosion behaviour of the nanocrystalline alloys in 2 M HCl solution was correlated with the AFM studies. The potentiodynamic experiments for these alloys showed a significant decrease of the current density peak at the active-passive transition in relation to the F-Cr4 amorphous alloy. The results indicated that the corrosion resistance and passivating ability of the alloys are improved by the thermal treatment.

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Section: Resultsmentioning

confidence: 98%

Section: Corrosion Resistance Of Nanocrystalline Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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