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  1. 56 Acta Physica Polonica A

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  1. 11 Csach K.

  2. 11 Juríková A.

  3. 11 Miškuf J.

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1
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Investigation of Effect of Annealing the Fe_{78}Si_{9}B_{13} Amorphous Alloy Using the EELS Method and the Hall Effect

100%
Kołodziej H., Jakubczyk E., Mandecki Z., Całusiński B.
Acta Physica Polonica A
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1993
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vol. 83
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issue 3
327-331
EN
The effect of structural relaxation on the electronic structure of Fe_{78}Si_{9}B_{13} metallic glass was investigated by means of the Hall effect, electrical conductivity and EELS methods. The effect of the structural relaxations was observed by four-hour annealing of the samples in argon atmosphere at temperatures 573, 673, 723, 773 K. The most distinct changes in the measured quantities were observed for samples annealed at 773 K. The differences in EELS spectrum, a decrease in the electrical and the Hall resistance are specific to these samples. X-ray diffractometry confirmed that the samples annealed at this temperature show recrystallization.
2
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Investigation of the Annealed Metallic Glass Fe_{28}Co_{50}Si_{9}B_{13} by the X-Ray and Electrical Resistance Methods

100%
Jakubczyk E., Mandecki Z.
Acta Physica Polonica A
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1994
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vol. 85
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issue 1
215-218
EN
In this paper results of investigations of the X-ray diffraction and the electrical resistance of the metallic glass Fe_{2}8Co_{50}Si_{9}B_{13} are presented. These investigations were performed for isothermally annealed samples during 4 hours in the temperature range from 573 to 823 K. As a result of annealing, the samples were obtained in a crystalline state. The second series of the investigations was performed for samples annealed at a constant temperature of 673 K but in different time intervals.
3
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Positron Annihilation Study of Structural Relaxation and Crystallization in Metallic Glasses Fe_{78-x}Co_{x}Si_{9}B_{13}

100%
Filipecki J.
Acta Physica Polonica A
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1993
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vol. 83
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issue 3
303-306
EN
Results of measurements of positron lifetimes and X-ray diffraction in the annealed metallic glasses Fe_{78-x}Co_{x}Si_{9}B_{13} (x = 0, 20, 40, 60, 78) before and after the process of crystallization are presented. From the results it follows that the annealing process below the crystallization temperature causes changes in concentrations of positron-trapping areas and can be consistently described as the result of two contributions: topological and chemical short range ordering. The process of crystallization causes precipitation of α-Fe and β-Co crystalline phases and also formation of microvoids in the investigated samples.
4
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Investigation of Structural Changes in Metallic Glass Fe_{18}_{C}O_{60}Si_{9}B_{13}

100%
Jakubczyk E., Filipecki J., Mandecki Z., Jakubczyk M.
Acta Physica Polonica A
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1995
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vol. 88
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issue 1
163-169
EN
Structural changes accompanying the isothermal annealing of the metallic glass Fe_{18}_{C}o_{60}Si_{9}B_{13} were investigated by X-ray diffraction, positron annihilation as well as by electrical resistivity and the Hall resistivity measurements. It has been found out that at the temperature of 673 K the complete crystallization did not occur, but only a few nuclei of the α-Fe phase, which did not grow, were formed.
5
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Structural Changes in Deformed Soft Magnetic Ni-Based Metallic Glass

63%
Juríková A., Csach K., Miškuf J., Ocelík V.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
393-395
EN
The effects of intensive plastic deformation of the soft magnetic metallic glass Ni-Si-B on the structural relaxation were examined. The enthalpy changes studied by differential scanning calorimetry revealed that the intensive plastic deformation was associated with the partial structural relaxation of the amorphous structure.
6
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Influence of Plastic Deformation on Magnetic Transition in Soft Magnetic Amorphous Alloys

63%
Miškuf J., Csach K., Juríková A.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1273-1275
EN
The influence of the intensive plastic deformation on the structure of ferromagnetic amorphous alloys has been studied by means of thermoanalytical methods. It was shown that the work of plastic deformation led to the local heating in thin shear band layers and the dissipation of the energy caused structural changes in the region outside these bands. The plastic deformation influences the structure of the alloys and their structural sensitive magnetic properties.
7
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Low Temperature Failure of Al_{90}Fe_7Ta_3 Amorphous Alloys

63%
Miškuf J., Csach K., Juríková A., Bengus V., Tabachnikova E., Shumilin S., Podolskiy A.
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issue 5
823-824
EN
The fractographic analysis was used for the interpretation of ultra-low temperature dependences of yield or fracture stress. Analysis of fracture morphology revealed that dominantly chevron morphology is present and that the failure of this amorphous material initiates at low temperatures at geometrical imperfections of ribbons and these failures are often presented as a premature failure.
8
Publication available in full text mode
Content available

High Temperature Structure and Properties of Grain Boundaries - Insights Obtained from Atomic Level Simulations

63%
Keblinski P.
Acta Physica Polonica A
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2002
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vol. 102
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issue 1
123-134
EN
Molecular-dynamics simulations of grain boundaries in Si and fcc metals reveal that high-energy boundaries are disordered, even at low temperatures, with their local atomic structure very similar to that of bulk amorphous material. By contrast, low energy grain boundaries are crystalline all the way up to the melting point. Upon heating intergranular"confined amorphous" structures of high-energy grain boundaries exhibit reversible transition into universal, highly confined, liquid-like structure. High-temp erature properties, such as the grain boundary diffusion therefore involve liquid-like mechanisms, with activation energies related to the diffusion process in the melt. By contrast to Si and fcc metals, high-energy diamond grain boundaries are more ordered structurally, but contain coordination disorder resulting from ability of carbon to change its hybridization from s p^3 to sp^2 character. Based on the insights obtained from our simulation of individual grain boundaries we were able to design nanocrystalline 3D microstructures, which allow to study grain boundary diffusion creep process by molecular-dynamics simulations. In order to prevent grain growth and thus to enable steady-state diffusion creep to be observed on a time scale accessible to molecular-dynamics simulations (of typically 10^{-9} s), our input microstructures were tailored to (i) have a uniform grain shape and a uniform grain size of nm dimensions and (ii) contain only high-energy grain boundaries that, consistently with our studies of individual, bicrystalline grain boundaries, exhibit rather fast, liquid-like self-diffusion at high temperatures. Our simulations reveal that under relatively high tensile stresses these microstructures, indeed, exhibit steady-state diffusion creep that is homogeneous with a strain rate that agrees quantitatively with that given by the Coble-creep formula.
9
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Influence of Plastic Deformation on Nanocrystallization of Finemet Alloy

63%
Csach K., Miškuf J., Juríková A., Janák G.
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issue 5
820-822
EN
The Finemet alloy prepared by the crystallization of an amorphous precursor is a basic model material for study of magnetic nanoparticle structures. Intensive plastic deformation localized in adiabatic shear bands causes the intensive heating and structural changes in the amorphous alloy. These changes influence the magnetic properties of the amorphous precursor for the Finemet crystallization.
10
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The Effect of High Co Addition on the Properties of Fe_{79}Zr_{9}B_{12} and Fe_{76}Zr_{9}B_{15} Alloys

63%
Yu W., Long D., Liu Y., Sun Y., Hua Z.
Acta Physica Polonica A
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2015
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vol. 128
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issue 3
340-342
EN
Thermal properties, microstructure and magnetic properties of Fe_{79}Zr_{9}B_{12}, Fe_{76}Zr_{9}B_{15}, Fe_{39.5}Co_{39.5}Zr_{9}B_{12} and Fe_{38}Co_{38}Zr_{9}B_{15} alloys were investigated by differential thermal analysis, X-ray diffraction and vibrating sample magnetometer. High Co addition has a significant impact on the properties of alloys. High Co addition increases the main crystallization peak temperature and the crystallization activation energy. Moreover, high Co addition changes the crystallization products and influences the crystallization processes of Fe_{79}Zr_{9}B_{12} and Fe_{76}Zr_{9}B_{15} alloys. The specific saturation magnetization (M_{s}) increases and coercivity (H_{c}) decreases by high Co additions.
11
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The Structural Stability of Soft Magnetic Fe-Co-Zr-W-B Metallic Glasses Investigated by the in-situ X-ray Diffraction

63%
Michalik S., Bednarcik J., Pawlik P., Matija R., Sovak P.
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vol. 126
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issue 1
66-67
EN
The atomic structure of as-prepared Fe_{61}Co_{(14-x)}Zr_{5}W_{x}B_{20} (x=1, 2 and 4) ribbon samples and their thermal stability were investigated by in-situ high-energy X-ray diffraction experiments. It was observed that higher W concentration causes the tiny shift of the main peak of the reduced atomic pair distribution function to higher values of interatomic distances and increases the coefficient of volume thermal expansion. The crystallization process occurs in two steps and is qualitatively the same for all studied specimens. Firstly the Fe_{23}B_{6} phase is created and later is transformed to other types of borides together with the creation of a Fe-based phase.
12
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The Effect of Nb Content on the Thermal, Structural, and Magnetic Properties of FeNbB Ribbons

63%
Hua Z., Zuo B., Li M., Wang X., Wang L., Liu J., Wang D., Dong L.
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vol. 125
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issue 5
1149-1151
EN
Amorphous Fe_{80-x}Nb_{x}B_{20} (x = 5, 10, 15) ribbons were prepared by single-roller melt spinning method. The thermal, structural and magnetic properties of Fe_{80-x}Nb_{x}B_{20} (x = 5, 10, 15) ribbons were investigated using differential thermal analysis, X-ray diffraction, and vibrating sample magnetometer. The thermal stability is the lowest for Fe_{70}Nb_{10}B_{20} ribbon and the highest for Fe_{65}Nb_{15}B_{20} ribbon. Along with the increase of Nb content, the supercooled liquid region Δ T_{x} increases, indicating that the amorphous formation ability improves. The primary stages of crystallization of the three ribbons are different. The primary devitrification phases are Fe_{23}B_6 type for Fe_{70}Nb_{10}B_{20} and Fe_{75}Nb_5B_{20} ribbons, and α-Fe type for Fe_{65}Nb_{15}B_{20} ribbon. Fe_{80-x}Nb_{x}B_{20} (x = 5, 10) ribbons are ferromagnetic and the Fe_{65}Nb_{15}B_{20} ribbon is paramagnetic. The saturation magnetization (M_{s}) decreases with increasing Nb content.
13
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Crystallization Process of Fe_{75}Co_5Zr_{10}B_{10} Amorphous Alloy

63%
Sun Y., Zuo B., Wang D., Meng X., Liu J., Wang L., Hua Z.
Acta Physica Polonica A
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2013
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vol. 124
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issue 4
685-687
EN
Fe_{75}Co_5Zr_{10}B_{10} amorphous alloy prepared by melt-spinning was annealed at various temperatures. The thermal property and microstructures were investigated by differential thermal analysis, X-ray diffraction, and transmission electron microscopy. The crystallization process of Fe_{75}Co_5Zr_{10}B_{10} amorphous alloy is complex. The α-Fe phase precipitates from the amorphous matrix in the initial stage of crystallization. The α-Mn type (χ) phase precipitates at 570°C, but transforms to α-Fe phase and the Laves C14(λ) phase at higher temperature. In the final stage of crystallization, Fe_3Zr, Fe_2Zr, and unknown phases are observed and the λ-phase disappears. The α-Fe phase preferentially nucleates after annealing at 530C for 10 min and the χ-phase preferentially nucleates after annealing at 600C for 10 min. The nucleation barrier of χ-phase is larger than that of α-Fe phase. The local structure of χ-phase is more similar to amorphous phase.
14
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Thermal Behavior and Crystallization of Fe_{81 - x}Co_{x}Zr_7Nb_2B_{10} (x = 2, 4, 6) Alloys

63%
Yu W., Sun Y., Liu L., Dong L., Hua Z.
Acta Physica Polonica A
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2011
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vol. 120
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issue 6
1034-1036
EN
Thermal behavior and microstructure of Fe_{81 - x}Co_{x}Zr_7Nb_2B_{10} (x = 2, 4, 6) alloys were investigated by differential thermal analysis and X-ray diffraction. Both the supercooled liguid region Δ T_{x} and the first crystallization peak temperature T_{p1} are the lowest and the span Δ T_{p} between T_{p1} and T_{p2} is the highest when 4 at.% Fe is substituted by Co. The crystallization activation energy E_{p1} for Fe_{75}Co_6Zr_7Nb_2B_{10} alloy is the minimum for the heating rates ν = 5-20 K/min. E_{p1} for Fe_{77}Co_4Zr_7Nb_2B_{10} alloy is the minimum for the heating rates ν = 20 - 50 K/min. The crystallization processes of Fe_{81 - x}Co_{x}Zr_7Nb_2B_{10} (x = 2, 4, 6) amorphous alloys are similar on the whole, which is as follows: amorphous → amorphous + α-Fe(Co) → α-Fe(Co) + Fe_3Zr + Fe_2Nb_{0.4}Zr_{0.6}.
15
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Creep Behaviour of Co-Based Amorphous Alloys

63%
Csach K., Miškuf J., Juríková A., Vojtaník P.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
91-94
EN
The detailed study of the temperature dependence of the viscosity of (Co, Fe)-(Si, B) amorphous metallic alloys up to crystallization temperatures was carried out. The kinetics of the non-equilibrium viscosity was described using Vogel-Fulcher-Tammann law below the glass transition temperature.
16
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Structural Relaxation of Ni-Si-B Amorphous Ribbon

63%
Juríková A., Csach K., Miškuf J., Ocelík V.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
99-102
EN
The structural relaxation of the Ni-Si-B amorphous ribbon was studied by means of differential scanning calorimetry and thermomechanical analysis. It was shown that considerable length changes associated with reversible structural relaxation were revealed after a previous creep applied at higher temperatures.
17
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Failure Behaviour of Fe- and Co-Based Amorphous Soft Magnetic Ribbons

63%
Miškuf J., Csach K., Juríková A., Janák G., Švec T., Konč M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
95-98
EN
Fractographic analysis of Co- and Fe-based high strength soft magnetic materials showed the high localization of the plastic deformation and the ductility in narrow shear bands. The estimated fracture toughness of these materials is closely associated with the scale of the local plastic zone.
18
Publication available in full text mode
Content available

Application of Third Generation Synchrotron Source to Studies of Non-Crystalline Materials: In-Se Amorphous Films

63%
Burian A., Jabłońska A., Burian A., Le Bolloc'h D., Metzger H., Proux O., Hazemann J., Mosset A., Raoux D.
Acta Physica Polonica A
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2002
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vol. 101
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issue 5
701-708
EN
The local structure of vacuum evaporated In-Se amorphous films, containing 50, 60, and 66 at.% Se, was studied using differential anomalous X-ray scattering and extended X-ray absorption fine structure. Both intensity and absorption spectra were measured in the vicinity of the absorption K-edge of Se. The differential anomalous X-ray scattering data were converted to real space by the inverse Fourier transform yielding the differential radial distribution functions. The obtained results provide evidence for the presence of Se-In spatial correlations for In_{50}Se_{50} and Se-In and Se-Se correlations for In_{40}Se_{60} and In_{34}Se_{66} within the first coordination sphere.
19
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Thermopower and Hardness Characterization of Structural Relaxation and Crystallization in FINEMET Type Amorphous Precursor Alloy

63%
Bán K., Szabó A., Ipach R., Szabó B.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
702-704
EN
In this paper, the thermopower (U) and hardness (HV) of FINEMET type glasses are studied during structural relaxation and beyond the crystallization onset. In this multicomponent alloy (Fe_{73.5-x}Si_{13.5}B_{9}Nb_{x}Cu_{1}) both property changes are more complex than that in binary Fe-B glasses. The phenomenon of relaxation and the crystallization onset can be successfully distinguished in both property changes. Simultaneously with the hardness increase, a slope increase in the thermopower versus temperature dependences was observed if crystallization started. The character of both property changes does alter drastically at the beginning of amorphous-nanocrystalline transformation. Similar trends were measured on samples undergoing traditional isothermal and pulse heat treatments.
20
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Nanoscale Fracture Morphologies of Soft Magnetic CoFeTaB Amorphous Alloy

63%
Miškuf J., Csach K., Juríková A., Huráková M.
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vol. 126
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issue 1
96-97
EN
We analyzed the failure characteristics of the bulk metallic glass Co_{43}Fe_{20}Ta_{5.5}B_{31.5} (at.%) deformed by compression and by bending of the ribbons. Under the load the amorphous structure can store high elastic energy. The surface morphology of nanoscale fracture is in accord with the micromechanisms of the failure of the amorphous structure. The fracture surface consists of a smooth mirror cleavage zone and a river pattern zone with nanosized dimples, arranged in lines respecting the periodic corrugation zones, oriented perpendicular to the crack propagation direction. The presence of the failure initiation centers in the ribbon influences the dynamics of crack propagation and also the surface morphology of the fracture.
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