Review on Soft Magnetic Metal and Inorganic Oxide Nanocomposites for Power Applications

2021 ◽  
pp. 159500
Author(s):  
A. Talaat ◽  
M.V. Suraj ◽  
K. Byerly ◽  
A. Wang ◽  
Y. Wang ◽  
...  
Keyword(s):  
Soft Magnetic ◽  
Inorganic Oxide ◽  
Magnetic Metal

scholarly journals Nanostructure and compositional segregation of soft magnetic FeNi‐based nanocomposites with multiple nanocrystalline phases

2021 ◽  
Vol 36 (1) ◽  
pp. 105-113
Author(s):  
P. Ohodnicki ◽  
E.J. Kautz ◽  
A. Devaraj ◽  
Y. Yu ◽  
N. Aronhime ◽  
...  
Keyword(s):  
Atom Probe ◽  
Free Energies ◽  
Orientation Relationships ◽  
Soft Magnetic ◽  
Transmission Electron ◽  
Magnetic Metal ◽  
Show Evidence ◽  
Multi Phase ◽  
Nanocrystalline Phases

AbstractSoft magnetic metal amorphous nanocomposite alloys are produced through rapid solidification and thermal annealing yielding nanocrystals embedded within an amorphous precursor. Similar free energies in Co‐rich and FeNi‐based alloy systems result in multiple nanocrystalline phases being formed during devitrification. Studies of multi‐phase crystallization processes have been reported for Co‐rich alloys but relatively few have investigated FeNi‐based systems. A detailed characterization of compositional partitioning and microstructure of an optimally annealed FeNi‐based MANC (Fe70Ni30)80Nb4Si2B14 alloy is presented through complementary high‐resolution transmission electron microscopy (HRTEM) and atom probe tomography (APT). HRTEM demonstrates orientation relationships between FCC and BCC nanocrystals, suggesting heterogeneous nucleation of nanocrystals in the amorphous matrix or a cooperative mechanism of nucleation between BCC and FCC nanocrystallites. APT results show evidence for (i) the segregation of Fe and Ni between nanocrystals of different phases, (ii) B partitioning to the amorphous phase, and (iii) an Nb‐enriched shell surrounding nanocrystals.

scholarly journals On the magnetic deformation of nickel

1898 ◽  
Vol 63 (389-400) ◽  
pp. 44-54 ◽  
Keyword(s):  
Royal Society ◽  
Unit Area ◽  
Nickel Wire ◽  
Soft Magnetic ◽  
Magnetic Metal ◽  
Longitudinal Tension

On a former occasion a paper was com m unicated to the Royal Society containing an account of some measurements of the magnetic contraction of a nickel wire, and a com parison of these with the values deduced from K irchhoff’s theory. It was there shown that the most important term in the calculated value of the elongation of a long wire of a soft magnetic metal is represented by ½ H(ôI/ôP), where H is the magnetising field and ôI the increase of mgnetisation produced by a small increase of longitudinal tension ôP per unit area. The results showed that the observed contraction in nickel was much greater than the calculated value.

Microstructure in soft magnetic E3 (S1, Al) (Sendust) alloys

1988 ◽  
Vol 46 ◽  
pp. 770-771
Author(s):  
June D. Kim
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Ternary Phase Diagram ◽  
Vertical Tube ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Soft Magnetic ◽  
Quenching Temperature ◽  
Thin Foils ◽  
Vertical Tube Furnace

Iron-base alloys containing 8-11 wt.% Si, 4-8 wt.% Al, known as “Sendust” alloys, show excellent soft magnetic properties. These magnetic properties are strongly dependent on heat treatment conditions, especially on the quenching temperature following annealing. But little has been known about the microstructure and the Fe-Si-Al ternary phase diagram has not been established. In the present investigation, transmission electron microscopy (TEM) has been used to study the microstructure in a Sendust alloy as a function of temperature.An Fe-9.34 wt.% Si-5.34 wt.% Al (approximately Fe3Si0.6Al0.4) alloy was prepared by vacuum induction melting, and homogenized at 1,200°C for 5 hrs. Specimens were heat-treated in a vertical tube furnace in air, and the temperature was controlled to an accuracy of ±2°C. Thin foils for TEM observation were prepared by jet polishing using a mixture of perchloric acid 15% and acetic acid 85% at 10V and ∼13°C. Electron microscopy was performed using a Philips EM 301 microscope.

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