A5009746511- Metallic Glasses and Amorphous Alloys
- Magnetic Properties and Applications
- Magnetic properties of thin films
- Magnetic Properties of Alloys
- Microstructure and mechanical properties
- High Entropy Alloys Studies
- Microstructure and Mechanical Properties of Steels
- Phase-change materials and chalcogenides
- Theoretical and Computational Physics
- Advanced materials and composites
Monash University
2015-2024
Materials Science & Engineering
2016-2024
Osaka University
2023
National Institute for Materials Science
2023
Toyota Motor Corporation (Japan)
2023
High Energy Accelerator Research Organization
2023
The effect of rapid annealing on the structural and magnetic properties melt-spun Fe-B based alloys has been investigated. grain size a Fe85B13Ni2 alloy after primary crystallization is reduced significantly by annealing, low coercivity 4.6 A/m high saturation magnetization 1.90 T are obtained. This comparable to those Si steels (1.8–2 T). core losses nanocrystalline lower 60%–80% as compared with commercial steels. Rapid found be effective in realizing magnetically soft nanostructure...
A brief survey of the recent advances in Fe-based nanocrystalline soft magnetic alloys has shown that saturation magnetization (Js) these is governed by mass fraction, rather than atomic nonmagnetic additives. Thus, ultimate limit Js prepared nano-crystallization amorphous precursors expected an Fe-B binary system where amorphization rapid quenching takes place with lowest fraction glass forming elements systems. We will demonstrate possible this when precursor phase annealed ultra-rapidly....
Magnetically soft nanostructures are known to be prepared by the primary crystallisation of Fe-based amorphous precursors containing Cu and/or Nb. These nonmagnetic additives essential for accelerated nucleation and retarded crystal growth during crystallisation. However, it has recently been found that none these necessary preparation similar when ultra-rapid annealing (URA) is employed. As a result, magnetically nanostructure with exceptionally high Fe contents realized in simple Fe–B...
The effects of metalloid additives (ML = B, C, Si and P) on the structural magnetic properties were investigated for nanocrystalline Fe86-xB14MLx alloys prepared by ultra-rapid annealing (URA) melt-spun ribbons. It was found that effectiveness URA affected these elements soft after degraded. Contrarily, addition 1 at% Cu to be effective in enhancing coercivity (Hc) reduced significantly addition. These well understood considering activation energy crystallization.
Ultra-Rapid Annealing (URA) is an effective means of producing Fe-rich nanocrystalline soft magnetic materials with desirable properties. However, compared to existing annealing techniques, URA presents many unique processing challenges that have so far limited its scalability. In this study, a novel Continuous (CURA) technique introduced. This based on reel-to-reel process and considered suitable for industrial-scale production. The effectiveness CURA evaluated by comparing the...
Nanocrystalline alloy samples with the same chemistry (Fe86B13Cu1) but a range of mean grain sizes were prepared in order to investigate effect size (D) on core losses nanocrystalline alloys. The loss was measured an Epstein frame frequency between 10 Hz and 30 kHz. separated into 3 parts, i.e. hysteresis loss, classical eddy current excess loss. is only minor component due small thickness moderately high electrical resistivity samples. Both coercivity cycle are found follow roughly D3...
In order to better understand the origin of field-induced anisotropy (Ku) in Si-free nanocrystalline soft magnetic alloys, lattice spacing bcc-Fe phase Fe94−xNb6Bx (x = 10, 12, 14) alloys annealed under an applied field has been investigated by X-ray diffraction transmission geometry (t-XRD) with vector parallel and perpendicular direction. The saturation magnetostriction (λs) was found increase linearly volume fraction residual amorphous is well described taking into account volume-weighted...
The soft magnetic properties in iron-based nanocrystalline alloys have generally been achieved through the addition of nonmagnetic additives, but this has unwanted effect reducing saturation magnetization. In a recent advance, it was shown that magnetically nanostructured could be prepared from simple, binary Fe-B amorphous precursor by ultrarapid annealing (URA). These materials had magnetization comparable to silicon steel, while refined grain structure resulted considerably lower core...
Nanocrystalline soft magnetic materials are known to be prepared by primary crystallization of Fe-based amorphous precursors. Since the reaction is exothermic, precursor may experience a temporary rise in its temperature relative surroundings during process nanocrystallization. Given typical latent heat (∼ 100 kJ/kg), this exceed hundreds degrees if not adequately controlled and thus, lead formation unwanted magnetically hard compounds. This effect generally small for isolated ribbons...
Nanocrystallization of Fe-based amorphous alloys is a vital route to design advanced soft magnetic alloys. Since crystallization stochastic nonequilibrium process, full understanding the nanocrystallization mechanism challenging task. In this work, influence thermal history glassy state on kinetics and properties after are studied systematically for model Fe86B14 alloy. By pre-annealing at different temperatures heating various rates, structural relaxation process thoroughly using high...