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Formation and magnetic properties of nanocrystalline mechanically alloyed Fe‐Co
Ch. Kuhrt,L. Schultz +1 more
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In this article, the phase formation and magnetic properties of Fe100−xCox powders were investigated with respect to phase formation using x-ray diffraction, differential scanning calorimetry, and measurements of the saturation magnetization and the coercivity.Abstract:
Fe100−xCox powders were prepared by mechanical alloying of the elements in a planetary ball mill They were investigated with respect to phase formation and magnetic properties using x‐ray diffraction, differential scanning calorimetry, and measurements of the saturation magnetization and the coercivity The measurement of the saturation magnetization proved the true formation of the bcc (x≤80) and fcc (x=90) solid solutions by mechanical alloying A nonequilibrium microstructure originates from a grain‐size reduction to minimum 20–30 nm and the introduction of internal strain up to 1% (root‐mean‐square strain) An improvement in the soft magnetic properties by the nanocrystalline state, as hoped for, does not occur, because the high amount of internal strain together with the high saturation magnetostriction of the Fe‐Co alloys causes relatively high coercivities of 5–40 A/cm Grain growth and strain relaxation induced by controlled heat treatment of the as‐milled powders allowed the separation of the inread more
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Mechanical Alloying And Milling
TL;DR: Mechanical Alloying (MA) is a solid-state powder processng technique involving repeated welding, fracturing, and rewelding of powder particles in a high-energy ball mill as mentioned in this paper.
Journal ArticleDOI
Structure and properties of nanocrystalline materials
TL;DR: A review of the current status of research and development on the structure and properties of nanocrystalline materials can be found in this paper, where a critical analysis of this aspect and grain growth is presented.
Journal ArticleDOI
Soft ferromagnetism in nanostructured mechanical alloying FeCo-based powders
TL;DR: In this article, the magnetic measurements on the dilute and concentrated powder samples, as well as the temperature dependence of the magnetic properties from 10 to 300 K, indicate that the degree of magnetic interaction between the individual powder particles, along with the particle morphology and size, causes the relatively high H C of 10−20 Oe at room temperature.
Journal ArticleDOI
Formation and magnetic properties of nanocrystalline mechanically alloyed Fe‐Co and Fe‐Ni
C. Kuhrt,L. Schultz +1 more
TL;DR: In this paper, the phase formation and magnetic properties of Fe100−xCox powders were investigated with respect to phase diffraction and measurements of the saturation magnetization and the coercivity.
Journal ArticleDOI
Formation of nanocrystalline Fe–Co powders produced by mechanical alloying
TL;DR: In this paper, the structural and magnetic properties of FeCo alloy powders produced by mechanical alloying of elemental powders were investigated and two kinds of milling methods (cyclic and conventional operation) were adopted to optimize the milling process.
References
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Model predictions for the enthalpy of formation of transition metal alloys II
TL;DR: In this article, the authors present a computer program in Algol 60 by means of which enthalpy effects can be calculated for binary alloys in which at least one transition metal is involved.
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Grain structure and magnetism of nanocrystalline ferromagnets
TL;DR: Amorphous ribbons of composition Fe/sub 73.5,Cu/sub 1/Nb/sub 3/Si/sub 13.5/B/sub 9/ have been annealed above their crystallization temperature, which produces a homogeneous, ultrafine grain structure of alpha FeSi with typical grain diameters of 10-20 nm.
Journal ArticleDOI
Structural and thermodynamic properties of heavily mechanically deformed Ru and AlRu
TL;DR: In this paper, the authors report on high energy ball milling of Ru and AlRu and show that the deformation results in a drastic decrease of the crystal size to a nanometer scale and an increase of atomic-level strain.
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