Investigation of (Fe,Co)NbB-Based Nanocrystalline Soft Magnetic Alloys by Lorentz Microscopy and Off-Axis Electron Holography

2014 ◽  
Vol 21 (2) ◽  
pp. 498-509 ◽  
Author(s):  
Changlin Zheng ◽  
Holm Kirmse ◽  
Jianguo Long ◽  
David E. Laughlin ◽  
Michael E. McHenry ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Fine Particles ◽  
Magnetic Domain ◽  
Nanocrystalline Alloys ◽  
Electron Holography ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Wall Width ◽  
Lorentz Microscopy ◽  
Soft Magnetic Alloy

AbstractThe relationship between microstructure and magnetic properties of a (Fe,Co)NbB-based nanocrystalline soft magnetic alloy was investigated by analytical transmission electron microscopy (TEM). The microstructures of (Fe0.5Co0.5)80Nb4B13Ge2Cu1 nanocrystalline alloys annealed at different temperatures were characterized by TEM and electron diffraction. The magnetic structures were analyzed by Lorentz microscopy and off-axis electron holography, including quantitative measurement of domain wall width, induction, and in situ magnetic domain imaging. The results indicate that the magnetic domain structure and particularly the dynamical magnetization behavior of the alloys strongly depend on the microstructure of the nanocrystalline alloys. Smaller grain size and random orientation of the fine particles decrease the magneto-crystalline anisotropy and suggests better soft magnetic properties which may be explained by the anisotropy model of Herzer.

Experimental Study of High Temperature Hydrozing Annealing 1J50 Alloy's Magnetic Properties

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Yingtao Zhang ◽  
Gang Wang ◽  
Zhenguo Nie ◽  
Wankai Shi ◽  
Yiming Rong
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Process Parameters ◽  
Quantitative Research ◽  
Annealing Process ◽  
National Standards ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Microstructure And Magnetic Properties

The good DC magnetic properties can be achieved for 1J50 soft magnetic alloy by applying high temperature hydrogen annealing. Annealing process parameters, e.g., atmosphere, soaking temperature, and time, are critical to soft magnetic properties. Qualitative results had been done for years. However a quantitative research among process parameters, microstructure, and magnetic properties can be more comprehensive and specific. In this study, a serial of experiments for 1J50 samples under the Chinese national standards. The influence of annealing temperature and socking time on DC magnetic properties and microstructure of the samples has been investigated on DC magnetic properties and microstructure of samples. The result shows that annealing process parameters have a nonlinear effect on the development of material microstructure and magnetic properties. Furthermore, the models among magnetic property, grain size, and process parameters have been built to quantitatively describe the interrelationship in between.

High Bs FeSiBPCu Nanocrystalline Wide Ribbons Using Industrial Raw Materials

2010 ◽  
Vol 654-656 ◽  
pp. 1102-1105 ◽  
Author(s):  
Akiri Urata ◽  
Hiroyuki Matsumoto ◽  
Shigeyoshi Yoshida ◽  
Akihiro Makino
Keyword(s):  
Raw Materials ◽  
Nanocrystalline Structure ◽  
Nanocrystalline Alloys ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Material Cost ◽  
Economical Advantage

Nanocrystalline Fe-Si-B-P-Cu wide ribbons, with 15-30mm width, using industrial raw materials have been investigated. A homogeneous nanocrystalline structure composed of α-Fe grains with around 10 nm in diameter was realized after crystallization and the nanocrystalline alloys exhibit the high Bs of 1.74-1.82 T, the low Hc of 6.5-7.2 A/m and the low W at 50Hz-1.7T of 0.42-0.60W/kg. Therefore, the nanocrystalline Fe-Si-B-P-Cu soft magnetic alloy has a large economical advantage of low material cost by using industrial raw materials.

scholarly journals A mechanically strong and ductile soft magnet with ultralow coercivity

2021 ◽  
Author(s):  
Dierk Raabe ◽  
Liuliu Han ◽  
Fernando Fernando ◽  
Isnaldi Souza Filho ◽  
Nicolas Peter ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Domain Wall ◽  
Volume Fraction ◽  
Tensile Elongation ◽  
Magnetic Domain ◽  
High Volume ◽  
Soft Magnetic Materials ◽  
Soft Magnetic ◽  
Wall Width ◽  
Frequency Changes

Abstract Soft magnetic materials (SMMs) are indispensable components in electrified applications and sustainable energy supply, allowing permanent magnetic flux variations in response to high frequency changes of the applied magnetic field, at lowest possible energy loss1. The global trend towards electrification of transport, households and manufacturing leads to a massive increase in energy consumption due to hysteresis losses2. Therefore, minimizing coercivity, which scales the losses in SMMs, is crucial3. Yet, meeting this target alone is not enough: SMMs used for instance in vehicles and planes must withstand severe mechanical loads, i.e., the alloys need high strength and ductility4. This is a fundamental design challenge, as most methods that enhance strength introduce stress fields that can pin magnetic domains, thus increasing coercivity and hysteretic losses5. Here, we introduce a new approach to overcome this dilemma. We have designed a Fe-Co-Ni-Ta-Al multicomponent alloy with ferromagnetic matrix and paramagnetic coherent nanoparticles of well-controlled size (~91 nm) and high volume fraction (55%). They impede dislocation motion, enhancing strength and ductility. Yet, their small size, low coherency stress and small magnetostatic energy create an interaction volume below the magnetic domain wall width, leading to minimal domain wall pinning, thus maintaining the material’s soft magnetic properties. The new material exhibits an excellent combination of mechanical and magnetic properties outperforming other multicomponent alloys and conventional SMMs. It has a tensile strength of ~1336 MPa at 54% tensile elongation, an extremely low coercivity of ~78 A/m (<1 Oe) and a saturation magnetization of ~100 Am2/kg. The work opens new perspectives on developing magnetically soft and mechanically strong and ductile materials for the sustainable electrification of industry and society.

Sign in / Sign up

Export Citation Format

Share Document