Correlation between the grain-shape and magnetic properties in nanocrystalline iron

Szabó, S.; Beke, Dezső L.; Harasztosi, Lajos; Daróczi, Lajos; Posgay, G.; Kis-Varga, M.

doi:10.1016/s0965-9773(97)00116-5

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…The techniques of inert gas condensation, [3,[47][48][49][50] pulsed plasma deposition, [25] and sputtering [48] have exclusively been used for processing thin films or small amounts of nanocrystalline materials, whereas it is necessary to produce/process bulk samples for oxidation/corrosion or mechanical testing. Electrodeposition [33,34,51] and severe plastic deformation [28][29][30][31][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68] have been recognized as the two relatively successful routes for processing thicker/larger sections of nanocrystalline metals and alloys. Pulsed electrodeposition has been employed successfully for processing nanocrystalline materials in bulk, [51] most notably, Ni-Fe and Ni-Co alloys.…”

Section: B Synthesis Of Nanocrystalline Alloysmentioning

confidence: 99%

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Mahesh

Raman

2014

Metall Mater Trans A

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The extremely fine grain size of nanocrystalline (nc) metallic alloys results in significantly different mechanical, electrochemical and oxidation properties as compared to the coarse-grained alloys of the same composition. Although the synthesis and attractive mechanical properties of nanocrystalline materials have been investigated and reviewed in great depth, the high temperature oxidation and electrochemical corrosion of these materials has received limited attention. The difference in the active dissolution and passivation behavior of nc alloys as compared to their microcrystalline counterparts varies for each alloy system. However, a unified theory explaining these phenomena still eludes us. In this context, this article reviews the progress in the electrochemical corrosion behavior of different nanocrystalline alloys, and hence, develops a better understanding of the effect of grain size, composition, interfacial phenomena and selective dissolution on corrosion of nanocrystalline alloys. This review also presents the role of nanometric grain size and the associated increase in grain boundary diffusion on the high temperature oxidation of nc alloys. The attractive possibility of enhanced oxidation resistance at lower alloying additions as compared to the coarse-grained alloys has been discussed. Although the primary focus of the article is on ferrous alloy systems, however, the lead studies on the role of ultrafine grain size in oxidation/corrosion behavior of other alloys systems have also been reviewed.

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Section: B Synthesis Of Nanocrystalline Alloysmentioning

confidence: 99%

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Mahesh

Raman

2014

Metall Mater Trans A

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“…The samples were also examined by transmission electron microscopy 35 measurements, which provide a more accurate and direct measurement of the grain size. Figure 2 shows a typical dark field image made by the ͑110͒-type reflections of the 160-h-milled sample.…”

Section: A Ball-milled N-fe Samplesmentioning

confidence: 99%

Mössbauer study of the interface of iron nanocrystallites

et al. 2000

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The hyperfine parameters of iron atoms are studied in iron nanocrystallites prepared by different methods: ball milling of iron powder, partial crystallization of Fe-Zr-B-Cu amorphous ribbons, and vacuum evaporation of Fe-B polycrystalline multilayers. Careful analysis of the spectral contribution of the possible impurities and chemical mixing at interfaces reveals that no specific grain boundary contribution can be separated in the Mössbauer spectra when the grain size is in the 2-10 nm range. The results indicate that excluding chemical effects the hyperfine fields of iron atoms at the bcc interfaces are very close to those in the bulk, and Mössbauer spectra of the iron nanocrystallites studied can be understood without supposing a separate grain boundary phase with very distorted structure or highly reduced density.

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“…Among them, the Nanoperm-type alloys have received much attention because these materials show excellent soft magnetic properties and can be used extensively in commercial applications. 1,2 These good soft magnetic properties depend on the microstructure of material, [3][4][5] so the structural characterization is very important in order to understand the physical behavior of the system.…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of Fe–Nb–B amorphous/nanocrystalline alloys produced by compaction of mechanically alloyed powders

Ipus

Blázquez

Franco

et al. 2010

Journal of Applied Physics

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Articles you may be interested inThe use of amorphous boron powder enhances mechanical alloying in soft magnetic FeNbB alloy: A magnetic study J. Appl. Phys. 113, 17A330 (2013) systems has been performed from an initial mixture of elemental powders. A bcc supersaturated solid solution is developed during milling for both alloys. However, Fe 75 Nb 10 B 15 alloy also develops an amorphous phase, which amount increases with milling time. Milled powder samples were compacted at 7.7 GPa at different temperatures. Scanning electron microscopy images show that the presence of amorphous phase enhances the quality of compaction. Compaction at 823 K preserves both microstructure and magnetic properties of as-milled powders in both alloys. Compaction at 973 K affects mainly the crystalline fraction of the alloy with 10 at. % Nb. Compaction at 1273 K yields the formation of bcc Nb and fcc Fe 23 B 6 phases, which magnetically harden the material.

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Correlation between the grain-shape and magnetic properties in nanocrystalline iron

Cited by 8 publications

References 9 publications

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Mössbauer study of the interface of iron nanocrystallites

Structure and magnetic properties of Fe–Nb–B amorphous/nanocrystalline alloys produced by compaction of mechanically alloyed powders

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