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Number of results: 8
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Analysis and Computer Modeling of Magnetoelastic Characteristics of FeNi-based Amorphous Ring-shaped Core under Uniform Compressive and Tensile Stresses

Roman Szewczyk Jacek Salach Adam Bieńkowski Dorota Jackiewicz
Theoretical and Applied Informatics | 2013 | vol. 25 | No 1 | 29-40
Keywords magnetoelastic effect amorphous alloys
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Abstract

Paper presents methodology of generation of the uniform, compressive or tensile stresses in ring-shaped amorphous alloys core. In this study we use the set of special nonmagnetic, cylindrical backings. These backings enabled the core to be wound as well as create the possibility of generation of uniform compressive and tensile stresses. Using presented methodology the magnetoelastic characteristics were experimentally determined for Fe40Ni38Mo4B18 Metglas 2826 MB amorphous alloy. Knowledge about these properties is important for users of inductive components with amorphous alloys cores due to the fact, that changes of flux density due to magnetoelastic effect exceed 40%.
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Authors and Affiliations

Roman Szewczyk
Jacek Salach
Adam Bieńkowski
Dorota Jackiewicz

The structure and properties of magnetic composites based on amorphous Fe alloys

Bartłomiej Jeż Przemysław Postawa Marcin Nabiałek
Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 4 | e144608 | DOI: 10.24425/bpasts.2023.144608
Keywords bulk amorphous alloys magnetic composites high temperature isostatic press
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Abstract

Materials with so-called soft magnetic properties are an important object of material engineering research due to their potential application, among others, in the construction of low-loss transformer cores. Such properties are typical for alloys with an amorphous structure and with a high content of ferromagnetic elements: Fe, Co, Ni. Difficulties related with obtaining alloys which meet satisfactory dimensions result in the search for new solutions. One of them is the production of composites based on ferromagnetic powders obtained from amorphous alloys. This paper presents results of structure research for composite materials produced in a multi-stage production process. Magnetic composites were made on the basis of a bulk amorphous Fe70B20Y5Nb4Mo1 alloy produced by the injection method. On the basis of the obtained powder, two series of moldings were made: with 0.5% resin and covered with high-temperature varnish. Final composites were produced by using high temperature isostatic press. On the basis of the conducted research, it was found that the composites without resin are characterized by distinctly better magnetic properties as compared to resin-bonded composites.
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Authors and Affiliations

Bartłomiej Jeż
1
ORCID: ORCID
Przemysław Postawa
1
Marcin Nabiałek
2
ORCID: ORCID
  1. Department of Technology and Automation, Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, al. Armii Krajowej 19c, 42-200 Czestochowa, Poland
  2. Department of Physics, Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, al. Armii Krajowej 19, 42-200 Czestochowa, Poland

Microstructure and Micromechanical Behaviors of Bulk Amorphous Alloy Prepared by Spark Plasma Sintering

Yaqiong Ge Zexin Chang Wenxian Wang Qingling Hou
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 1 | 31-36 | DOI: 10.24425/amm.2023.141468
Keywords Bulk amorphous alloy Spark Plasma Sintering (SPS) Microstructure Micromechanical behaviors
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Abstract

This study aimed to prepare Zr55Cu30Al10Ni5 bulk amorphous alloys by spark plasma sintering of raw amorphous alloy powders and investigate their microstructure and micromechanical behaviors. When the sintering temperature ( Ts) was 675K, which was lower than the glass transition temperature ( Tg) of the material, the sintered sample was almost fully amorphous but the density was lower. However, when Ts was 705K, which was higher than Tg, partial crystallization occurred, but the density was higher. The hardness of the bonding zone of the sintered sample at 675K was 5.291 GPa due to the lower density, which was lower than that at 705K, and the hardness at 705K was 8.836 GPa. The generation of thermodynamically stable intermetallic phases, the hardness, and the elastic modulus of the samples sintered above Tg were higher due to the higher density.
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Authors and Affiliations

Yaqiong Ge
1
Zexin Chang
1
Wenxian Wang
1
Qingling Hou
1
  1. Taiyuan University of Science and Technology, College of Materials Science and Engineering, Taiyuan 030024, China

The Effect of Layer Thickness on the Reflectance of a Quasi One-Dimensional Composite Built with Zr55Cu30Ni5Al10 Amorphous Alloy and Epoxy Resin

S. Garus W. Sochacki
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 2 | 503-510 | DOI: 10.24425/amm.2021.135885
Keywords amorphous alloy aperiodic multilayer mechanical waves phononic crystal bandgap
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Abstract

The study examined the impact of the angle of incidence of mechanical waves on various types of quasi one-dimensional superlattice. Binary periodic structure, quasi-periodic distribution of Thue-Morse layers and Severin’s aperiodic multilayer were used. Using the concatenation and recursive rules, the distribution of layers was determined for individual structure types for generation numbers equal to 3, 4 and 5. The structures were selected so that the thickness of the composite was the same for each type of distribution for a given generation number value. Transfer Matrix Method algorithm was used to determine reflectance. The band structure of reflectance has been demonstrated for incidence angles up to 90 degrees at mechanical wave frequencies up to 50 kHz. The existence of wide bands of high reflectance above the acoustic frequencies was demonstrated for the analyzed structures. Increasing the layer thickness caused an inhomogeneous shifts of transmission peaks towards lower frequencies.
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Authors and Affiliations

S. Garus
1
ORCID: ORCID
W. Sochacki
1
ORCID: ORCID
  1. Czestochowa University of Technology, Department of Mechanics and Fundamentals of Machinery Design, Faculty of Mechanical Engineering and Computer Science, 73 Dąbrowskiego Str., 42-201 Częstochowa, Poland

Effects of Yttrium (Y) Substitution by Cerium (Ce) on Microstructure and Corrosion Behavior of Near-Equiatomic Alniy Medium-Entropy Amorphous Alloy Ribbons

Shuyan Zhang Zhibin Zhang Xin Wang Yangyang Gao Xiubing Liang
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 2 | 637-643 | DOI: 10.24425/amm.2022.137800
Keywords Medium-entropy amorphous alloys corrosion behavior Thermal stability analysis Microstructure Cerium content
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Abstract

Through partially replacing Y element, Ce was added into near-equiatomic AlNiY medium-entropy amorphous alloy (denoted as MEAA) ribbons by the melt spinning process in this study. The differences of microstructure, thermal stability, hardness and corrosion resistance of Al33.3Ni33.3Y33.4-xCex (x = 0, 2, 5, 8, 13) alloy ribbons were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), differential scanning calorimeter (DSC) and Vickers-type hardness tester. The anti-corrosion performance in 3.5 wt.% NaCl solution of alloy ribbons was investigated elaborately through the general potentiodynamic polarization curves (Tafel) and electrochemical impedance spectroscopy (EIS). Results suggested that all ribbon samples could remain amorphous structure and the hardness are all above 510 HV0.1. With the increase of Ce content, the thermal stability begins to be gradually lower. However, according to the analysis of crystallization kinetics, all types of MEAA ribbons presents the relatively prominent thermal stability compared with traditional Al-based amorphous alloys. The corrosion current density raises firstly, then shows a decreasing trend, and has a slight increase at last. Therefore, appropriate content of Ce element can improve the corrosion protection performance of alloy ribbons and the 5 at.% Ce MEAA ribbons exhibited the excellent corrosion resistance in this study.
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Authors and Affiliations

Shuyan Zhang
1 2
ORCID: ORCID
Zhibin Zhang
2
Xin Wang
2
Yangyang Gao
1
Xiubing Liang
1
ORCID: ORCID
  1. Zhejiang University, Ocean College, Zhoushan 316021, Peoples Republic of China
  2. Defense Innovation Institute, Academy of Military Sciences of The PLA of China, Beijing 100071, Peoples Republic of China

The use of DSC curves and the Kronmüller theory to study the level of structural defects of Fe-based bulk amorphous alloys

Bartłomiej Jeż Marcin Nabiałek
Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 2 | e144613 | DOI: 10.24425/bpasts.2023.144613
Keywords injection-casting method bulk amorphous alloys soft magnetic materials free volume structural defects
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Abstract

This article presents the results of tests carried out on rapid quenched Fe-based alloys. The alloys were made using an injection-casting method. The actual structure of the alloys was also studied using an indirect method, based on H. Kronmüller's theorem. Based on analysis of the primary magnetization curves, in accordance with the aforementioned theory, it was found that Mo causes a change in internal regions associated with changes in the direction of the magnetization vector. The evolution of the thermal properties with increasing volume of Mo has been confirmed by the DSC curves. Addition of Mo, at the expense of the Nb component, results in changes to the crystallization process (i.e. the crystallization onset temperature and number of stages). The study showed that the addition of Mo at the expense of Nb reduces glass forming ability. Based on the DSC analysis, free volumes were determined for the alloys tested. These values were compared with the analysis of primary magnetization curves. It was found that the DSC curves can be used to indirectly describe the structure of amorphous alloys similar to the theory of the approach to ferromagnetic saturation. This approach is new and can be used by many researchers in this field.
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Authors and Affiliations

Bartłomiej Jeż
1
ORCID: ORCID
Marcin Nabiałek
2
ORCID: ORCID
  1. Department of Technology and Automation, Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, al. Armii Krajowej 19c, 42-200 Czestochowa, Poland
  2. Department of Physics, Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, al. Armii Krajowej 19, 42-200 Cz ̨estochowa, Poland

The Prediction of Optimized Metalloid Content in Fe-Si-B-P Amorphous Alloys Using Artificial Intelligence Algorithm

Min-Woo Lee Young-Sin Choi Do-Hun Kwon Eun-Ji Cha Hee-Bok Kang Jae-In Jeong Seok-Jae Lee Hwi-Jun Kim
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 4 | 1539-1542 | DOI: 10.24425/amm.2022.141090
Keywords Fe-based amorphous alloy Metalloid elements Artificial intelligence Coercivity Saturation magnetization
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Abstract

Artificial intelligence operated with machine learning was performed to optimize the amount of metalloid elements (Si, B, and P) subjected to be added to a Fe-based amorphous alloy for enhancement of soft magnetic properties. The effect of metalloid elements on magnetic properties was investigated through correlation analysis. Si and P were investigated as elements that affect saturation magnetization while B was investigated as an element that affect coercivity. The coefficient of determination R2 (coefficient of determination) obtained from regression analysis by learning with the Random Forest Algorithm (RFR) was 0.95 In particular, the R2 value measured after including phase information of the Fe-Si-B-P ribbon increased to 0.98. The optimal range of metalloid addition was predicted through correlation analysis method and machine learning.
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Authors and Affiliations

Min-Woo Lee
1
ORCID: ORCID
Young-Sin Choi
1
ORCID: ORCID
Do-Hun Kwon
1
ORCID: ORCID
Eun-Ji Cha
1
ORCID: ORCID
Hee-Bok Kang
2
ORCID: ORCID
Jae-In Jeong
2
ORCID: ORCID
Seok-Jae Lee
3
ORCID: ORCID
Hwi-Jun Kim
1
ORCID: ORCID
  1. Smart Liquid Processing R&D Department of Korea Institute of Industrial Technology, Incheon 21999, Korea
  2. R&D Center of Youngin Electronic, Youngin 1033, Korea
  3. Jeonbuk National University, Division of Advanced Materials Engineering, Jeonju 54896, Korea

Influence of the Cooling Rate on the Heterogeneity of the Structure in the Rapid Quenched Fe – Based Alloys with the Si Addition

B. Jeż
Archives of Metallurgy and Materials | 2024 | vol. 69 | No 1 | 231-235 | DOI: 10.24425/amm.2024.147813
Keywords Amorphous alloys primary magnetization curve soft magnetic materials magnetization in strong magnetic fields
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Abstract

The paper presents the results of research from the analysis of primary magnetization curves for Fe based amorphous alloys. Structural defects in the form of pseudodislocation dipoles occur in amorphous alloys. Using the theory developed by H. Kronmuller called the approach to ferromagnetic saturation, it is possible to indirectly observe internal stresses occurring in the volume of amorphous alloys. The magnetic structure is sensitive to all kinds of inhomogeneities that become visible in the process of high-field magnetization. It has been shown that the cooling rate of the liquid alloy has a great influence on the migration of atoms during the solidification process. Longer time of alloy formation causes more atoms to occupy ordered positions, which results in a change in the distance between the magnetic atoms and a higher degree of structure relaxation. This is indicated by a significant difference in the value of the spin wave stiffness parameter Dspf. The structural differences of the alloys were also investigated using a magnetic balance. It has been shown that the cooling rate influences insignificant differences in the course of thermomagnetic curves and the Curie temperature.
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Authors and Affiliations

B. Jeż
1
ORCID: ORCID
  1. Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science, Department of Technology and Automati on, 19c Armii Krajowej Str., 42-200 Czestochowa, Poland

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