scholarly journals Dependence of magnetic properties with structural/microstructural parameters of ball-milled Fe15Co2P3 powder mixture

2021 ◽  
Author(s):  
Hanane Berkani ◽  
Rachid Siab ◽  
Wassila Tebib ◽  
Locif Redouani ◽  
Saida Boukeffa ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Powder Mixture ◽  
Microstructural Parameters

scholarly journals Influence of mechanical activation and heat treatment on magnetic properties of nanostructured mixture Ni85.8Fe10.6Cu2.2W1.4

2019 ◽  
Vol 55 (1) ◽  
pp. 85-93 ◽  
Author(s):  
M.M. Vasic ◽  
A.S. Kalezic-Glisovic ◽  
R. Milincic ◽  
Lj. Radovic ◽  
D.M. Minic ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Thermal Treatment ◽  
Mechanical Activation ◽  
Powder Mixture ◽  
Structural Characteristics ◽  
Volume Density ◽  
Magnetic Domains ◽  
Microstructural Changes ◽  
Mass Magnetization ◽  
Stress Relieving

The mechanical activation of the Ni85.8Fe10.6Cu2.2W1.4 powder mixture in the time intervals of 30-210 min in combination with thermal treatment at 393-873 K resulted in microstructural changes, forming the nanostructured mixture of the same composition but improved magnetic properties. The best result were achieved for mechanical activation during 120 min and thermal treatment at temperatures close to the Curie temperature (693K), enhancing the mass magnetization of the starting powder mixture by about 57%. The microstructural changes, which include the structural relaxation, decrease in free volume, density of dislocation and microstrain, improve structural characteristics of material, enabling better mobility of walls of magnetic domains and their better orientation in applied magnetic field and consequently enabling better mass magnetization of the material. With longer time of milling, the growing stress introduced in the sample undergoes easier relief, relocating stress-relieving processes toward lower temperatures.

The Effect of Cu, P, Ga and Gd on Microstructure and Magnetic Properties in the PrFeCoBNb HD Sintered Magnets

2010 ◽  
Vol 660-661 ◽  
pp. 273-278 ◽  
Author(s):  
T. Mendes ◽  
S.C. Silva ◽  
E.A. Périgo ◽  
Rubens Nunes de Faria Jr. ◽  
Hidetoshi Takiishi
Keyword(s):  
Magnetic Properties ◽  
High Energy ◽  
Alloying Elements ◽  
Phosphorus Addition ◽  
Sintered Magnets ◽  
Microstructural Parameters ◽  
Intrinsic Coercivity ◽  
Standard Composition ◽  
Curve Profile ◽  
Microstructure And Magnetic Properties

An evaluation of the effect of alloying elements on the microstructure and magnetic properties of Pr15FebalCo8B7Nb0.05Mx (M = Cu, P, Gd and Ga; 0 ≤ x ≤ 0.25) sintered magnets has been carried out. A mixture of alloys and the high-energy milling technique have been used to prepare the magnets. The alloying elements have influenced the remanence, intrinsic coercivity and particularly the squareness factor (SF). Phosphorus addition improved (BH)max (254 kJm-3 ) and SF around 10% (0.89). The same improvement addition on intrinsic coercivity was observed with Gallium (1100mT) compared to the standard composition Pr15FebalCo8B7Nb0.05 (1000mT) magnet. Comparisons between the squareness factors obtained using the J×μ0H curve profile (SF), the estimated (sf) using microstructural parameters and Sf using a (BH)max and Br correlation have also been carried out.

scholarly journals The influence of mechanochemical activation and thermal treatment on magnetic properties of the BaTiO3-FexOy powder mixture

2015 ◽  
Vol 47 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Z. Ristanovic ◽  
A. Kalezic-Glisovic ◽  
N. Mitrovic ◽  
S. Djukic ◽  
D. Kosanovic ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxides ◽  
Powder Mixture ◽  
Mechanochemical Activation ◽  
Total Sample ◽  
Xrd Analysis ◽  
Activation Time ◽  
Solid State Reaction Technique ◽  
Content Change ◽  
Maximum Magnetization

Powder mixture of 50 mass % of barium titanate (BaTiO3) and 50 mass % of iron (Fe) was prepared by solid-state reaction technique, i.e. ball milled in air for 60 min, 80 min, 100 min, 120 min and 150 min. During mechanochemical activation it was observed the iron powder transitsion to iron oxides. Depending on the activation time the content of iron oxides FeO, Fe2O3 and Fe3O4 varies. Simultaneously, with the content change of the activated system, magnetic properties change as well. The XRD analysis of milled samples shown that as the activation time increase, the iron oxide percentage increases to, whereby the percentage of BaTiO3 in a total sample mass decreases. The percentage of iron oxides and BaTiO3 in annealed samples changes depending on annealing temperature. The thermomagnetic measurements performed by Faraday method shown that the powder mixture milled for 100 minutes exhibit maximum magnetization prior to annealing. The increase of magnetization maximum was observed after annealing at 540?C with all milled samples, and at room temperature it has enhancement from 10 % to 22 % depending on the activation time. The samples milled for 100 min and 150 min and then sintered at 1200w?C exhibit magnetoelectric properties.

Magnetic properties of nanostructured Fe92P8 powder mixture

2009 ◽  
Vol 471 (1-2) ◽  
pp. 24-27 ◽  
Author(s):  
R. Bensalem ◽  
W. Tebib ◽  
S. Alleg ◽  
J.J. Suñol ◽  
L. Bessais ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Powder Mixture

Enhancement of Magnetic Properties of 41CrMo4 Steel by Means of Diffusion Coatings

2017 ◽  
Vol 891 ◽  
pp. 560-564
Author(s):  
David Jech ◽  
Ladislav Čelko ◽  
Rostislav Huzlík ◽  
Tomáš Bulín ◽  
Lenka Klakurková ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Powder Mixture ◽  
Digital Image Analysis ◽  
Thermal Spraying ◽  
Flame Spray ◽  
Isothermal Heat Treatment ◽  
Arc Spray ◽  
Diffusion Coatings ◽  
Magnetic Circuits ◽  
Digital Microscope

The knowledge of magnetic and transport properties of construction steels for magnetic circuits plays an important role. Three different techniques: (i) flame spray, (ii) twin wire arc spray and (iii) powder mixture with halide activator were used to produce Si, CuSn6 and Si coatings, respectively, on the 41CrMo4 steel ring substrates. Immediately after the thermal spraying or inserting the steels into the powder mixture was used isothermal heat treatment at the temperatures of 800 °C / 6 hrs, 1000 °C / 4 hrs and 1250 °C / 2 hrs to produce the diffusion coatings. Several coating systems consisting of different phases and thicknesses were manufactured. Opto-digital microscope, scanning electron microscope and digital image analysis, second equipped with energy dispersive microanalyzer, were utilized to characterize the microstructure, chemical composition and thicknesses of the coatings. The influence of coatings on magnetic properties in the frequency range of 50-2000 Hz was also measured.

scholarly journals Dependence of Magnetic Properties with Structural/Microstructural Parameters of Ball-milled Fe15Co2P3 Powder Mixture

2021 ◽  
Author(s):  
Hanane BERKANI ◽  
Rachid SIAB ◽  
Wassila TEBIB ◽  
Locif REDOUANI ◽  
Saida BOUKEFFA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Powder Mixture ◽  
Research Work ◽  
Milled Powder ◽  
Quantitative Phase Analysis ◽  
Mechanically Alloyed ◽  
Microstructural Parameters ◽  
Refinement Method ◽  
The Face

Abstract This research work aims to investigate the mechanically alloyed Fe15Co2P3. Parametric Rietveld refinement method, of the obtained X-ray patterns, was performed for qualitative and quantitative phase analysis, structural, microstructural and mechanical properties. The ball-milled powder mixture crystallized within the face-centred cubic α-Fe(P) solid solution in equilibrium with Co75Fe25 phase. The crystallite size decreases reaching 100 and 200 nm respectively after 3h of milling. The highest values of the dislocation density, microstain and stored energy are registered for the α-Fe(P) solid solution. The studied mechanical properties manifest the brittle nature of the α-Fe(P) solid solution compared to the Co75Fe25 phase. The squareness ratio Mr/Ms and the coercivity values of the milled powders increase with increasing milling time and reach steady state after 2 h. The hysteresis loss energy and maximum permeability reach minimal values of 45*10− 4 W/m3 and 49*10− 3 H/m respectively, after 1 h of milling at the opposite of the switching field distribution.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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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